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Optimize Your AC

Optimize Your AC

New York Times6 days ago
CHRISTINE: I would love for you to explain, in the simplest terms, how AC works.
THOM: Sure, so there's a little fairy inside the box. Okay.
CHRISTINE: I'm Christine Cyr Clisset.
CAIRA: I'm Caira Blackwell.
ROSIE: I'm Rosie Guerin, and you're listening to The Wirecutter Show .
CHRISTINE: This episode is called Optimize Your AC
ROSIE: Hello.
CAIRA: Hi.
CHRISTINE: Hello.
ROSIE: Welcome to another episode of The Wirecutter Show , Caira and Christine.
CHRISTINE: Oh. Well hello, Rosie.
CAIRA: Why are we talking like this?
ROSIE: Today is a serious topic.
CHRISTINE: It's hot.
ROSIE: It is hot.
CHRISTINE: It's so hot.
ROSIE: It's so hot. And actually, let's get serious about talking about cooling off your house. This is the time of year I have to start prodding my super to install our AC window units, because it is so hot.
CAIRA: My super never offered to uninstall and install my AC units.
ROSIE: I think it's a liability thing, which honestly I'm glad, because I never felt confident about throwing those units in and slamming the window down.
CAIRA: Yeah.
CHRISTINE: My husband does it, and I just leave.
ROSIE: I don't have one of those.
CHRISTINE: I'm like, "I'll see you later."
ROSIE: I don't have-
CHRISTINE: Oh, well yeah.
ROSIE: I have window units, but not a husband.
CHRISTINE: But you have a super. Well, I grew up without AC. I'm from the Pacific Northwest and a lot of people in the Pacific Northwest do not have AC. And that is becoming a bigger issue, because it's getting hotter. A lot of people don't have windows that will fit a window AC, and a lot of people don't have central AC. So it can be really tricky.
ROSIE: I remember in the dead of summer, having to rely on the window fans that my dad would install in my bedroom.
CHRISTINE: Oh, yeah.
ROSIE: This was before we had central air, and it was like, "Yeah, that was what we had."
CHRISTINE: Yeah. We have a lot of coverage on our site around air conditioners. We have guides to window units, and portable units, and split units, which we're going to talk about in a little bit. But we also have a lot of coverage around how to keep your home cool even if you do not have AC, and there's a lot of different strategies you can use.
CAIRA: Yeah. So today on the show we're going to talk with staff writer Thom Dunn who reviews all kinds of air conditioning units. He's going to walk us through how window and portable units have become a lot better over the past decade, and he'll also share some strategies that anybody can use regardless of the type of AC they're using or if they have it to begin with to keep their home cooler.
CHRISTINE: And we're also going to talk with senior staff writer Liam McCabe about heat pumps, which can replace a traditional AC system. These can be a beneficial investment if you're a homeowner considering an upgrade to your heating and cooling system.
ROSIE:
And a bit later, we'll tell you about a recent recall of Wirecutter's favorite window AC, the Midea U. Christine will lay out how to figure out if you have a recalled model at home and what you can do about it. We'll be back after a break with everything you need to know about AC's with Thom Dunn. Stick around.
CAIRA: Welcome back. With us now is Thom Dunn, who is a staff writer who focuses on heating, cooling and humidification gear. He's tested over 100 ACs and fans for Wirecutter since 2017. For our window AC guide alone, Thom has tested over four dozen AC units, and he's manually installing them in his home in the muggy Boston Heat himself.
CHRISTINE: Welcome to the show.
THOM: Thank you for having me.
ROSIE: God's work, Thom, God's work. Thom, how are you testing all of these window AC units in your home? Is it like you have 48 windows and 48 AC units?
THOM: The first year I tested this, we actually lived in Ithaca, New York, and I had an extra guest room that had three hung windows in it. That's the kind that vertically slides up and down. And I think my neighbors thought I was a psychopath, because I had three ACs stacked in all the windows of one bedroom. At our home now, I have exactly one hung window. So my spring is a nice frantic ballet as I wait for the weather. And I have all the ACs ready to go to pop them in there, and I take my first round of tests as quickly as possible as the weather permits in April and May. Once I can identify the best of the ACs I have, I can start to really dig in deeper on various metrics and various experiences that I like to look for as I test them to figure out which ones are the best.
ROSIE: What are the metrics?
THOM: Generally speaking, most window air conditioners, the specs that you get on the box, on the Energy Star label or whatever are usually pretty accurate. They tell you what the energy efficiency is, they give you an approximate power level and room size. That's usually all pretty accurate because Energy Star tracks that stuff and that's great. So what I try to do is I measure the noise level with the fan, and the different fan settings with the different compressor settings. I don't just measure the volume. I have a spectrometer on my phone so I can see what kind of frequencies are spiking here and there. So I'm like, "Oh, that one, I was just testing one right before this call, and I noticed that when the compressor was on it added 10 decibels just on the low end, and I had these really annoying spikes."
So I could look at the spectrometer and be like, "Oh yeah, that's that whining thing in my ear that's making me want to hit myself in the head." That's what that sound is. And I take those notes. And while I do that, I also, I have it plugged into an energy consumption monitor so I can track how much power it's using.
ROSIE: So you're actually measuring the energy output, you're measuring noise level. What else makes it into the metric?
THOM: So then I also have a few monitors set up around my office so I can track over the course of several hours how the temperature and the humidity changes. The general testing process is that I will let them run for usually about two hours, and I leave the monitors, one about three feet away and one about six feet away on a diagonal and I track all the changes in temperature and humidity. And I go back and look at that and be like, "How well is it moving air around the room? How quickly did it cool the room?"
And the whole time I do that, I am sitting in the room taking notes anyway, seeing how comfortable... Maybe I thought a fan was loud at first. But then when you're sitting in the room you go, "Yeah, no, that's okay." Sometimes you sit in the room and you think it's a great air conditioner, and then you go, "Why am I so uncomfortable right now?" And then you start digging in more to figure out what about this one is making me feel miserable?
ROSIE: Is user experience part of the testing as well, just in terms of how you get this in and out of a window if it's a window unit, or how you have to maintain it if you need to maintain it at all?
THOM: User experience is definitely a factor. It is a funny catch with ACs, because I think as a general rule we can expect that they're all miserable to deal with. They're all cumbersome, they're all heavy. None of them are fun to lug into a window and pull the top window down quickly to hold it in place. Some of them are worse than others, and some of them are better than others. Our long-running, what's our budget pick now, is this Frigidaire model. I look at that as the most perfectly mediocre air conditioner you could find.
ROSIE: It's the one to beat.
THOM: Yeah, that's our budget pick at the moment. We've recommended it for years, because it's perfectly fine. And that's the metric point I use for how easy is this one to put together and install, or how easy are the controls here?
CHRISTINE: Thom, I would love for you to explain in the simplest terms how AC works, because it's just like magic. There's cool air that comes in, it's great, but I actually don't know what's happening inside the machine. So can you just explain how AC works?
THOM: Sure, so there's a little fairy inside the box. Okay. So you AC, whether it's... Whatever kind it is, it's basically sucking in the air from the house, and then it drags it over a coil of refrigerant, a chemical that gets really cold. As it drags the air over the cold coil, that cold coil pulls out some of the heat particles and some of the moisture, like when a cold cup sweats in the summer.
So it collects the heat and the moisture on the cold coil, and there's this whole refrigerant compression and then condensing process. But the TLDR version is that there's a fan that then takes the moisture and the hot air and blows it out the back. And then another fan that takes whatever's left and throws it back into the room.
CHRISTINE: So it's like this cycle. Pulling in the hot air from inside your home, cooling it off and then spitting out the cooled air back into your room and all the hot stuff back outside.
THOM: Yeah, that's right.
CHRISTINE: Okay. And it doesn't matter what type of AC you have, whether it's a window unit, a portable unit, central air, any kind of AC works in the same way.
THOM: Correct.
ROSIE: What is the difference between a window unit and a portable unit?
THOM: An air conditioner in general is whatever conditions your air. And that could be your central HVAC system, it could be a heat pump, it could be a window or a portable air conditioner. Window units require a hung window. The hung window helps to keep the window AC in place, so that's a requirement. Half the unit is in the house, half the unit is outside, so you get the good stuff on the inside and the bad stuff all goes outside.
Not everyone has a hung window though. There are all kinds of different windows, or for various reasons you might not be able to put a window unit in your hung window even if you have one.
CAIRA: But my house upstate has windows that open left to right.
THOM: Those are not hung. In that case, you would need to use a portable air conditioner. And portable air conditioners are a bit more adaptable. That's the good thing about them. They often come with these window kits that can fit into all kinds of different other window settings. You can really make them work in a lot of different scenarios, including in a hung window.
The trick with the portable AC though is that they're not as efficient as a window unit. First of all, you have a big R2D2 looking thing that has to sit there in your room and it takes up space. There's also the fact that it has these clunky octopus tentacle hoses that have to pump the air out the window. So you have to exhaust some of the air, and by basic physics of mechanics, when all the hardware inside the air conditioner is working, it produces some heat.
So the portable AC is now sitting in your room producing heat, radiating heat out of itself, and then you're also trying to cool the room. But by trying to cool the room, AC itself is working against itself by heating up. And then it also has to push the hot air that it's removing from the room out of the tubes and out the window. But even then, you're starting to lose some of the hot air as it moves out of those tubes and that it leaks into your room.
So the portable AC is kind of fighting against itself. Whereas when you have a window air conditioner right in the window there, it's pushing the cold air into the room and it's pushing all the hot air and mechanical heat radiation out the back outside.
CAIRA: Most of the window and portable units that Wirecutter recommends, that you recommend, Thom, use something called an inverter compressor. You see that word all over the guides. What is that, and why is it important, and how does it actually make an AC more efficient?
THOM: The compressor is the part of your air conditioner that when you turn it on and you hear it in the background go, that's the compressor. What that does is it helps transform the cold refrigerant from a liquid into a high pressure gas, which you can then expel outside along with all the other hot air it collects.
Historically, these compressors had two modes. They were on or off, zero or 100%, and that's why it made that annoying noise. A lot of people complain about their older air conditioners that when they start you're like, "Oh, it's on. Okay, I hear it." Because there's the fan, and then there's just that low rumble and it just kicks on and it's annoying.
An inverter compressor works more like the gas pedal on a car. You can push it all the way and really throttle up, or you can slowly ease on the gas and you don't ever have to stop the car completely. It's energy efficient, and it's much, much, much more pleasant.
CHRISTINE: And it's more energy efficient, Thom. Is that because if you're fully stopped and then to restart and get up to speed, whether you're in a car or whether you're getting up to speed and the machine is running, that takes more energy than just running at a low level all the time?
THOM: Exactly. It takes a lot more energy to start and get into motion, whereas if you were already in motion, you'd keep going.
ROSIE: If I have an older AC unit without an inverter compressor, it sounds like I should consider upgrading it.
THOM: Yes and no. Generally speaking, I'm against upgrading your air conditioner unless you absolutely have to. Maybe that's just my larger environmental concerns. You have these chemical refrigerants which are not good for the planet. You don't want to dump those into the town dump. You have all this metal and styrofoam. But if your machine is hurting, if it's not cooling the air and you need a new air conditioner, I would absolutely recommend looking for an inverter model whenever possible.
CAIRA: Well, I remember in my first apartment in New York, it was a three bed, it was tiny. But for whatever reason, the only AC unit that my dad thought to give me was 100 pounds, huge. We carried it up six flights of stairs, and we decided to put it in the living room. It overly cooled the living room, and all of the bedrooms stayed hot. And I just wonder what size AC unit should I have gotten for that apartment to make it a livable space? So I know that AC units come in all these different sizes, but how do you know if you're getting the right size?
THOM: Right. Well first of all, in that situation... So your living room was cool, right?
CAIRA: Yeah, it was freezing. But the bedrooms were all steaming.
THOM: Okay. The trick there is you should have left the doors open during the day and had some fans running.
CAIRA: Oh.
THOM: That could have helped a lot. I know you have roommates, you don't want to-
CAIRA: We all just basically live in the one room. It's just all the doors are open.
THOM: Right. I do understand that, and that puts you in a weird spot. So that way it wouldn't be miserably cold in the living room and it would spread that air around. But on a larger scale, the answer to that question, ACs are typically sized in BTU, British thermal units. I don't know why.
CAIRA: The Brits.
ROSIE: Colonialism.
THOM: Yeah, I don't know who in Britain invented this necessarily, but it is the amount of energy needed to heat one pound of water by one degree. Most of these air conditioners that you'll find today give a room size recommendation. So we typically test using 8,000 BTU models. 8,000 BTUs are usually recommended for rooms of 250 to three 50 square feet. I'm guessing, Kyra, that your dad got you a 12,000 BTU AC for that room.
ROSIE: It was huge, Thom.
THOM: I'm going to guess, which is usually for 450 or 500 square feet and up.
CAIRA: Our entire apartment was probably 300 square feet total.
THOM: Right, you lived in New York, I get it.
It can be tempting to be like, "Oh, cool, this one's bigger and colder." But that is a temptation you should resist. Last year, I started wondering about this because they were so much cheaper, especially I found that Costco always had sales on huge versions of our picks. And what I found, I did some tests last year. I was testing one of the 12,000 BTU units in my office space. I was so miserable. I went and grabbed a hoodie. And I was sitting here and I was like, "Okay, it's July, it is 85 degrees outside and I just went to get a hoodie."
My office felt like I was in Ireland. I just felt damp. And that's because the larger ACs can do a worse job of removing the moisture from the air. So they will do a fantastic freaking job of just cooling your room really fast. Your room goes from 80 to 60 and you're comfortable. Great. You think, except the humidity in the room has barely changed at that point, and now you are feeling clammy, and you are feeling damp and it sucks.
CHRISTINE: So basically, Thom, to keep your home at a comfortable temperature, you should get an AC unit appropriately sized for your space. And if you're finding that you're not feeling comfortable in an air conditioned room, it may be a humidity issue?
THOM: Yeah, the ACs direct some of their energy to cooling and some of it to moisture removal, and the larger ones just can't remove as much of the moisture as quickly. I will add, a lot of the air conditioners come with built-in dehumidifier modes, and a lot of them also have some sort of auto setting. And for most people actually, especially if you have an inverter model, I actually recommend just leaving your AC pretty much all summer on the auto setting. Because that way there are some days where it's not that hot but it's really humid, and the AC will flip over to dehumidify mode and actually cool you down.
ROSIE: So to that end, Thom, the $100 million question, do we need to be turning our AC off when we leave the house or the apartment to save energy?
THOM: No. Not necessarily. As far as your own energy bill use goes, you can actually save money by leaving your air conditioner on. I did a piece last year. I set up air conditioners in three units stacked in my building across the course of several days during a heat wave. And for some of the days I turned the ACs off during work hours, air quotes, and then turned them back on around four PM before people got home from work. And then the other days I left them running all day at a higher temperature.
And when I left it running all day, it used a lot less energy and it was ultimately more comfortable. So if you really want to save the energy and be more comfortable, you want to just turn your AC up a little bit when you're not home.
ROSIE: That's very surprising.
CAIRA: Hot take.
CHRISTINE: Yeah.
ROSIE: And a very hot take.
THOM: I'm going to get so many angry emails again. And you know what? I stand by it.
CHRISTINE: So for folks listening at home, if you're in the market for either a window unit or a portable unit, which is not as great as a window unit, you might want to think about an inverter model that has an inverter compressor. And all of us should be thinking about just keeping our ACs on instead of turning them off. It can be more energy efficient that way, especially if you're using an inverter compressor.
CAIRA: But also get an AC unit that fits the size of your room.
CHRISTINE: Exactly.
THOM: Bigger is not always better, folks.
CHRISTINE: Okay, so we've covered the basics of portable and window AC units. But for some people listening at home, you may not have a window unit or a portable unit. Maybe you have central air, which is when your heating and cooling runs through duct work in the walls or the ceiling. Or maybe you have ductless mini splits, and those are the units that are mounted onto a wall, or a ceiling or the floor that also serve as both a heater and an AC unit.
So if you're a homeowner, you may end up coming to a cross in the road where you have to decide whether you're going to upgrade your AC and your heating. And oftentimes today, that means you're going to be talking about a heat pump. So we're going to actually take a break right now, and when we're back, we're going to bring on another one of our colleagues, Liam McCabe, to talk to us about heat pumps and why someone might want to consider one if they're about to upgrade their HVAC system.
And then Thom, we're going to have you back, and we're going to talk a little bit more about what anyone can do to keep their home cooler. Whether they are using AC, or whether you don't have AC and you're just facing a heat wave and you need to figure out how to keep your home cool. We'll be right back.
CAIRA: Welcome back. This episode is all about keeping your home cool this summer. Earlier, we talked with Thom Dunn about what you should know about window and portable AC units, which are a great solution for people who don't have central air or split units. We're going to come back to Thom in a bit. But right now, we're going to focus briefly on what homeowners should consider if they're thinking about upgrading their cooling system.
CHRISTINE: That's right. And for that, we're going to welcome another Wirecutter colleague, senior staff writer Liam McCabe, to tell us about heat pumps, what they are and why you might want to consider one if you have a split unit or central air.
CAIRA: Liam, welcome to the show.
LIAM: Hi, Caira.
CAIRA: Hi. So you've written about heating and cooling for Wirecutter for years, and you also worked briefly at EnergySage, which is a company that helps connect heat pumps and solar panels with homeowners, right?
LIAM: Yep, that's right.
CAIRA: And you've also written a lot about heat pumps and home electrification. So can you tell me what exactly a heat pump is and how does it relate to air conditioning?
LIAM: So a heat pump, they've actually been around for decades, but the tech improved a lot recently. They're all electric, so they don't use gas or oil, and it's super energy efficient for heating, so there's a lot of excitement from a clean energy perspective. If your house already has duct work in it, it's already there, you can... Instead of having a furnace and an air conditioner hooked up, you can just put a heat pump on there the same way that you would hook up an air conditioner. So there's a box outside your house. When we're talking about air conditioners, that's called condenser, but everyone just knows it is the big box outside the house.
CAIRA: Oh, with the fan?
LIAM: With the fan, yeah.
CAIRA: Okay.
LIAM: Yeah, yeah. And then there's an interior part, the coil, and that's attached to your duct work. And a fan blows across it. And if the coil's cold, you're going to get cold air through your ducts. That's air conditioning. If it's hot when the furnace is running or when the heat pump is in heating mode, it blows warm air through your ducts. That's where you get your heating.
So with a ductless system, it's the same principle. You still have the outdoor box, but instead of one coil hooked up to the central duct work in your house, you have a bunch of mini coils all around your house in every room that you want to heat and cool. And it's all contained in that wall wart, as people call it, or the indoor unit as it's more technically referred to. And it's the same process happening, it's just in a slightly different format.
CAIRA: That sounds very similar to the way that Thom just described how AC units work, except heat pumps can do heating and cooling, whereas ACs can only do cooling.
LIAM: Right. So in cooling mode, a heat pump works exactly the same way as an air conditioner. There is actually no difference at all. People think of it like it's actually bringing cold air into your house. What it's really doing is absorbing the heat into the cold coil, and then sending it outside through that box that's outside.
In heating mode, it works backwards. There's a coil outside the house too. That's soaking up the heat from the ambient air, and even when it's really cold outside, there's actually heat out there. The coil will soak up that heat, move it inside to the indoor coil, and then that will be hot or warm at least, and the fan will blow across the warm coil and move the heat throughout your house.
CAIRA: I'm pretty personally invested in this, because I bought an old, rickety wooden cabin in upstate New York, and it's got no heating or cooling system that's centralized. It's got this gigantic propane heater, and no AC at all. So I looked into getting a heat pump for the house, and I was just floored by how expensive these can be, tens of thousands of dollars. So why switch to a heat pump if it's that expensive?
LIAM: So any kind of HVAC upgrade, a central system like a furnace or an air conditioner, especially if your home doesn't already have it, is going to be five figures. It's a similar level of expense as what you got for the mini split quote. It's a huge comfort upgrade over window ACs. A mini split is usually the easiest way to get central or built-in AC to your house if your home doesn't already have it, and it's just a huge quality of life improvement. It's much quieter, your windows aren't blocked, you don't have to move anything. The cheap heat you get from them is almost like a bonus, and it looks better. Not everyone loves the wall mount style, some people call them wall warts. But they're ...
CAIRA: They don't look that bad.
LIAM: No. And some manufacturers make some that look a little better. LG has one that looks like a picture frame. And then there's different styles. You can have them floor mounted, you can put them in the ceiling. So there's a lot of different options.
CAIRA: So it sounds like it might be an upfront cost, but it'll pay itself back in the long run. And also, it's just a luxury aesthetic upgrade.
LIAM: Yeah, so there is some payback. And aside from the money, you have to think about paying yourself back in terms of comfort. They usually work better also than the window ACs do, though that's changed a little bit. And yeah, it's a lifestyle upgrade in a way, just not having to deal with the hassle of the window units.
CAIRA: So what do you think one thing people considering getting a heat pump don't know that they really should?
LIAM: I think the trickiest part is the installation. We know the technology works really well when it's installed correctly, but it's hard to find someone who actually knows how to do it well. I did some reporting on this depending on who I talked to. They thought it was anywhere from 30% to 50% of heat pumps are installed so badly that it really has an effect on the comfort and the cost that you can expect on your utility bills.
CAIRA: Yikes.
LIAM: Yeah, and probably more than that are subpar compared to what they could be. But 30% to 50%, you're probably going to notice a problem. It's just not living up to the potential they have for comfort and energy savings. And sometimes the technology takes the blame, but it's usually because the installer didn't set things up correctly.
CAIRA: Luckily, you wrote a piece about how to find a good heat pump installer so people can refer to your guide if they really want to know all the details.
LIAM: Yeah, I've been told it scares people as much as it helps them. But I think it's better to be informed rather than going in without any background. So yeah, the story's up on Wirecutter and hopefully people find it helpful.
CAIRA: Can you tell me how people are paying for this, just assuming that you don't have five figures just sitting around in the bank?
LIAM: Sure, yeah. Heat pumps are often incentivized through rebates or tax credits. There is currently, for now, a $2,000 federal tax credit. If you get a system installed that meets all the requirements for efficiency, it's a fraction of the overall cost but it's still useful. And then some states or local utility companies have their own rebate programs. You have to work with your installer, usually there's some paperwork to do. But they can be pretty big. In Massachusetts, we've had one that will give you $10,000 back off the cost of the installation.
CAIRA: Wow.
LIAM: Yeah. I also found that it probably raised the price of installation by $7,000 or so.
CAIRA: No.
LIAM: Yeah. Some of the money goes into your pocket, but a lot of it goes into the pockets of the installers, and that's another topic for another time, I guess.
CAIRA: You got to spend money to make money. Or in this case, spend money so somebody else can make money.
LIAM: That's one way to think about it, yeah. A lot of the areas that have incentives for heat pumps also have these really low interest or 0% loan programs. It's another way to try to encourage people to adopt this technology.
CAIRA: All right, well thank you so much, Liam.
LIAM: Thanks, Caira.
CHRISTINE: All right, we are back with Thom Dunn to talk about some of the universal tips that anyone can use to keep their home cooler this summer. Thom, what are some of your basic strategies that anyone could use, whether they're using AC or not, to keep their home cooler this summer?
THOM: If you want to keep your home comfortable, honestly, all year round, weatherization is so key. You can get weatherizing strips you can line around your windows for example, or under your door. And that can make a humongous difference by keeping the outdoors air and the indoors air separate. You can honestly, a lot of times tell, if you just put your hand near the window or near the door, and there's sometimes gaps around plumbing or if you have air conditioning, or any pipes leading out of your home. Any of those little kinds of tiny cracks, you can very, very easily fill in with weather strips or with caulk. That will make probably the biggest difference.
Especially during the summer, you can also consider the way you're using shades, the way sunlight is getting into your room. When the sun gets into your house, it's going to get hotter, and sometimes that's awesome, especially in winter, but sometimes it's going to heat your house up and make it harder for you to work. So just close the blinds. And it feels sometimes silly to close the blinds when it's a beautiful sunny day outside. But when it's a beautiful sunny day outside and the sun is boiling you at 95 degrees, you want to keep that far away from you.
CHRISTINE: And Thom, there are certain shades that are more effective at blocking out heat from outside. I think that we have a piece on the site that talks about cellular shades.
THOM: Yes. I was grasping for the word there, but thank you. It was that cellular shades are a fantastic way to keep the heat on the outside.
CAIRA: Well what's a cellular shade?
CHRISTINE: They almost look like two shades that are glued together, and they're like a fan almost.
CAIRA: Oh, yeah. Yeah, yeah, yeah.
CHRISTINE: Yeah, yeah. And they create an air pocket that helps insulate.
THOM: Yeah, cellular shade sounds way fancier. And you open the box, you're like, "Cool, it's some crinkly paper."
CAIRA: It's important, I mean.
THOM: But it does a great job.
ROSIE: Weatherize, window AC units, portable AC units. What about ye olde time fan?
THOM: Fans are where it's at. I generally prefer fans to air conditioning myself. So we have fans propped up all over our houses. Now we have a heat pump, so we do use the AC a lot more now. But the fans also help to keep the cold air then circulating around the house, which makes it even better. As I said earlier, if you do have a larger air conditioner in your home, you can use some extra fans to pull the air away from your living room or wherever and redirect it so that it moves into other parts of the house.
CAIRA: Yesterday, my partner and I were debating if it's better on a boiling hot summer day to have a breeze that's blowing hot air or no breeze at all. So to that end, if you have no AC unit but you do have fans, are you hurting yourself or are you helping by circulating the hot air, even though there's no cool air coming in?
THOM: You're still helping yourself. On a very basic biological level, our bodies sweat, and the purpose of sweat is to cool us down when the wind comes by. So even if it's a hot day and you only have hot air in the house, you're sweating. And a fan is still going to blow the moisture, the sweat off your skin, and that's going to make your body cool down. That is literally our most basic biological cooling practice.
ROSIE: Well, and then you have ceiling fans.
THOM: Ceiling fans. If you have a ceiling fan, just leave it on all summer. One of the neat tricks with ceiling fans is that they work just as well in the winter and the summer, but you have to make sure you change the direction of the fan. So warm air is lighter than cold air, and it rises up into the room. So during the winter, you want to run your ceiling fan clockwise, which will then help to push the warm air down to the room so that you're not losing all the heat you've been generating and paying for.
Then during the summertime, you want to run the opposite direction. You want your fan to run counterclockwise, so that way it pulls the warm air up and out of the room and keeps pushing the cooled air back down so you're not overusing your air conditioner. Otherwise, your ceiling fan would basically be dumping your AC air over into the next room or out the window or whatever, and you don't want that.
ROSIE: The more you know.
CHRISTINE: There we go, there we go.
ROSIE: I've lived all these years, I never knew. Thom, thank you so much for joining us. Our thanks to Liam McCabe. Thanks, Thom.
CHRISTINE: Thanks, Thom.
CAIRA: Thank you.
THOM: Thank you.
CHRISTINE: After we recorded our interview with Thom, our favorite window AC, the Midea U, was recalled. And most if not all Midea U buyers are eligible for either a prorated refund or a repair kit from Midea. They might also send out a technician in some cases to help you fix the unit.
ROSIE: And this is one of those inverter compressor ACs we discussed earlier in the show. So for listeners who have this AC, and it's a very popular one, we wanted to give you a quick cheat sheet on what to do. So Christine, give us the who, what, where, when, why.
CHRISTINE: This Midea U air conditioner, which is recommended by Wirecutter and a bunch of other sites, it was recently recalled over complaints about mold growing on the fan inside the unit. Listeners should keep in mind that mold can actually grow inside any air conditioner. It's not just the Midea Us, but this is an issue for this particular one. So it's important if you do have a Midea U you should be participating in this recall.
ROSIE: Okay, so what should folks do to check if they're affected?
CHRISTINE: To check your media for mold, you should look inside the grill. We're going to put a diagram in the show notes and see if there's any mold growing there.
ROSIE: So, probably use a flashlight or something like that to check.
CHRISTINE: Yes, absolutely. Use a flashlight, or a headlamp.
ROSIE: And then if you find mold, or if you suspect there's mold there, what can you do?
CHRISTINE: So, like I said, all Midea buyers are eligible for some kind of refund, but the amount varies depending on how long you've used the unit. You can get on Midea's site and check your model number to see if you're part of this recall. To get the refund, you'll need to fill out a form online, and then the company will either have you return the unit with a prepaid shipping label, which seems not many people are going to do that. These are huge units. They're very heavy. Or they will ask you to cut the cord and take a picture of it and send it to them. But if you'd rather keep the unit that you already have because it's huge and maybe you don't see a lot of mold in there, the company will mail you a DIY repair kit to help the AC unit drain better, which is essentially the issue. If your AC doesn't have a drain plug already, the company says it will send a technician out to drill one.
ROSIE: And then what can folks do to reduce the chance of mold growing in their AC unit to begin with?
CHRISTINE: Anyone with a window AC unit should really be running the fan, because that'll help everything dry out inside. And that's particularly true for these models, like the Midea U, which are these inverter compressor units. So run the fan. Keep things blowing, kind of like when you run the pan in your bathroom after a shower.
ROSIE: There you go. Thanks for that, Christine.
CHRISTINE: No problem.
ROSIE: Today, we had a double hitter, Thom and Liam.
CHRISTINE: We had the heating-cooling super duo.
CAIRA: I really didn't think I was going to find it so interesting to learn how AC units worked.
ROSIE: Who knew?
CHRISTINE: Yeah.
ROSIE: What are you guys actually taking away from this ep?
CHRISTINE: Well, I was totally shocked and surprised when Thom explained why some of these larger window air conditioners that don't dehumidify as effectively. It really hit home for me why one of my rooms is not as cool as comfortable feeling as I would like it to be. But I think that I might consider getting a dehumidifier also if I can't get that room to be more comfortable.
ROSIE: Yeah. The idea that if your AC isn't working as well as maybe you hope or want it to be, it could be a question of humidity.
CHRISTINE: Of humidity, and not just cooling.
ROSIE: Making you uncomfortable, yeah.
CHRISTINE: Right, exactly.
ROSIE: My take-away, honestly, is simple weatherizing.
CHRISTINE: Yeah. We will also link in the show notes, we have some very specific recommendations for different weatherizing tools.
CAIRA: I love that. My take-away is from my talk with Liam because... So I'm going to save up some coin, but then eventually in the future, I think I might actually go with a split AC unit because it's still an easier construction job than building ducts to get a whole heat pump system.
CHRISTINE: Yeah.
ROSIE: Look for those incentives.
CAIRA: Yeah.
ROSIE: Get a loan.
CAIRA: Yeah.
ROSIE: Low interest.
CAIRA: With 0% interest.
ROSIE: With 0% financing.
CHRISTINE: That's right.
ROSIE: Well, if you want to find out more about Wirecutter's coverage of ACs, splits, heat pumps, any of it, check out our website. As ever, you can find a link in the show notes. You can check out Thom and Liam's reporting. Stay cool out there. That's it for us this week.
CAIRA: Thanks for listening.
CHRISTINE: Bye. The Wirecutter Show is executive produced by Rosie Guerin, and produced by Abigail Keel. Engineering support from Maddy Masiello and Nick Pittman. Today's episode was mixed by Katherine Anderson. Original music by Dan Powell, Marion Lozano, Alicia Baetube and Diane Wong. Wirecutter's Deputy publisher is Cliff Levy. Ben Frumin is Wirecutter's editor in chief. I'm Christine Cyr Clisset.
CAIRA: I'm Caira Blackwell.
ROSIE: And I'm Rosie Guerin.
CHRISTINE: Thanks for listening.
BLOOPER
ROSIE: Where in Boston do you live, remind me?
LIAM:
I'm out in Natick, I think you said you have some cousins out here?
ROSIE:
Natick, yah! I sure did.
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How to Get Rid of Ants and Roaches for Good
How to Get Rid of Ants and Roaches for Good

New York Times

time10 hours ago

  • New York Times

How to Get Rid of Ants and Roaches for Good

DOUG: Roaches love, and this is a phrase used in the pest control world, is cracks and crevices. So a roach is extremely happy if they have their feet on one surface and their back is against another surface. CHRISTINE: I'm Christine Cyr Clisset. CAIRA: I'm Caira Blackwell. ROSIE: I'm Rosie Guerin and you're listening to The Wirecutter Show . ROSIE: All right, Caira and Christine, it's time for us to finish a task we started months ago. CHRISTINE: Ooh, what is it? ROSIE: Well, last fall you'll recall we did an episode about how to get rid of mice and rats. CAIRA: How could I forget? ROSIE: It was a real skin crawler. This spring we did one of course on combating mosquitoes and ticks. CAIRA: Yes. CHRISTINE: And everyone's favorite. ROSIE: Everyone's favorite. How to keep those off your clothes in person. Now the trifecta is completed because sadly we have to talk about roaches and ants. CAIRA: You don't really like this sequel. CHRISTINE: This is the worst. This is the worst of the trifecta, I think. ROSIE: Have y'all dealt with them? You both live in New York? CHRISTINE: I've had them, but not like roach infestations. I've never had that problem. CAIRA: I have. ROSIE: Sure, I sure have too. CAIRA: I have. ROSIE: This is my second apartment in New York many, many years ago, made a friend over who came out of our bathroom white as a ghost, and she was trembling said that she found a giant roach on the head of one of our toothbrushes. I thought we were never going to see her again. It was horrible. CHRISTINE: Well, okay, obviously a roach infestation is disgusting. ROSIE: Ants are pretty bad too. CHRISTINE: Ants are gross too. These are not fun problems to have, and sometimes the solution is pretty simple, just clean up. But sometimes the answer is not so simple. Sometimes it's pervasive, it's really hard to take care of. And so today we are going to call our favorite pest management expert, Wirecutter senior staff writer Doug Mahoney, who has also shared with us how to get rid of other creepy crawly things in your home. CAIRA: If you're a regular listener of the show, you probably already know Doug, and you might also remember that he lives on a hobby farm in New Hampshire where he has combated in his barn where he's contracted Lyme disease five times from ticks, and he's tested all kinds of bug repellents. Doug's going to fill us in on what works and when You should just call it quits and actually call a pro. Because if you're not careful, you can make an ant or roach infestation much worse. ROSIE: This poor guy has seen it all. CHRISTINE: He really has. We'll take a quick break and when we're back, we'll get into the first steps you should take. If you see ants or roaches in your home, we'll be right back. CAIRA: Welcome back. With us now is Doug Mahoney. He's Wirecutter's senior staff writer covering home improvement and pest management gear. In addition to writing our guides to ant and roach traps, Doug has written about mosquitoes, flies, bug zappers, wasp and hornet sprays and bug repellents, and also why essential oils are not good bug repellents. For our coverage, he's interviewed a lot of pest management experts, entomologists and other bug experts. CAIRA: Welcome, Doug. It's so good to have you back. DOUG: Hi, how is everybody? CHRISTINE: We are good. Doug, at this point, you're such a regular on the show. Could we just maybe install a podcast studio in your barn? I feel like you live on this farm in New Hampshire. What is the bug situation there? Do you have ants? Do you have roaches? Are roaches a thing in New England? DOUG: We have ants, sort of a seasonal summer ant thing. Just like a lot of people, we really don't deal with roaches. I don't have a ton of firsthand, thankfully, a ton of firsthand experience combating roaches, but flies are certainly an issue, especially if you have animals. CAIRA: I would take a million flies over one roach. CHRISTINE: Yeah, they're gross. CAIRA: So Doug, in our mice and rat episode, you quizzed us on our Rodent IQ and I think you've come prepared with another quiz. So you're going to test us today about our ant and roach IQ, right? DOUG: Yes. We'll see how you guys do. CAIRA: Okay. DOUG: So the first one, ants do not sleep like humans. Instead, they take a series of naps over the course of a day. So how many naps on average does an ant take in a day? A. 25, B. 50, C. 150, D. 250. ROSIE: God, 250 naps is my dream. That's actually my dream. CAIRA: What qualifies as a nap? Like three seconds. How do you take 250 naps in a day? ROSIE: My gut says 150. CHRISTINE: I was going to say that too. CAIRA: Yeah, I'm going to go with 150 also. DOUG: The correct answer: ants take 250 micro naps in a day, each lasting about a minute a piece. CAIRA: Oh my God. Wait, that's really cute. I don't know why. DOUG: Which adds up to about four to five hours of sleep each day. CHRISTINE: And is that just because they are literally working so hard, they have to take these little minute naps? DOUG: I don't know. I think that's just how they roll. They just go plugging along and shut down for just little bit. ROSIE: How many naps do you think I can fit into this episode? DOUG: Okay, so the second question. How long can a cockroach live without its head? A. One hour, B. one day, C. a couple days, D. A couple weeks. CAIRA: I think it's a couple weeks. CHRISTINE: Oh my god. Of options, I am praying it's number one because that is just frightening if it's any longer than, what did you say? An hour? DOUG: One hour. CAIRA: Is the first one? DOUG: One hour, one day, a couple days or a couple weeks. ROSIE: I think one day. CHRISTINE: I'm going to say an hour. I'm just praying. I want it to be an hour. DOUG: I'm sorry, Christine. It's a couple weeks. CHRISTINE: What? No, I was right the first time. ROSIE: I hate this so much. CHRISTINE: Wait, so what do you have to do to actually kill this thing? Is it a vampire? You have to spike it with a wood spike. DOUG: Just crush it. CAIRA: You have to kill the whole thing. CHRISTINE: Is crushing it completely with my foot going to kill it. DOUG: That'll probably do it. CAIRA: Okay. DOUG: That'll probably do it. CAIRA: All right. DOUG: Okay, so we all know about cockroaches surviving the Nuclear war. So true or false of insects, cockroaches are the most resistant to radiation. CAIRA: True. ROSIE: True. CHRISTINE: False. DOUG: False. MythBusters actually did a piece on this. They exposed cockroaches, fruit flies, and flour beetles to different levels of radiation, and it was the flour beetle that performed the best. After exposure to 100,000 rad, a unit of radiation measurement, which is about a hundred times what a human could survive, 10% of the flour beetles were still alive. CAIRA: Oh my God. CHRISTINE: And how many of the cockroaches were alive? DOUG: No cockroaches made it. CAIRA: Thank God. CHRISTINE: Voilà. ROSIE: Wow, Christine. CHRISTINE: I seem to know more about bugs than I want to. ROSIE: All right, so ants and roaches are clearly different. I would strongly argue roaches are the more disturbing problem. Do you treat these infestations in the same way, Doug? DOUG: You basically do. There's certainly behavioral differences between those two bugs, but as far as the products you use and how you use them, it's basically the same. CAIRA: Okay, break it down. DOUG: So basically there are four things you want to do. First, you want to observe and identify the bugs. You want to find out really what you're dealing with, where they're coming into your home, where they're spending their time. Then as with any pests in the house, whether it's mice, rats, roaches, ants, you want to really just clean up, seal up any food, especially pet food. When researchers raise cockroaches, they feed them dog food. CAIRA: Hate that. DOUG: Yeah, they're particularly attracted to that. And you want to clean up things like you want to make sure the counter is wiped down every night, the sink is cleaned out too. If you've found out where they're coming in your home, you want to seal up any entry points. And then as far as getting rid of the bugs that are in your house, you want to use a bait. CHRISTINE: Okay. So let's start with observing and identifying bugs. Is there any kind difference in how you approach that with ants versus cockroaches? DOUG: Not really. You want to just see really as far as ants, it's a pass fail test. You either have ants or you don't, unless you're seeing signs of carpenter ants, and that's going to be little bits of sawdust or small holes bored into the wood of your home. If you see that you should just immediately call a pest control operator. Basically, you're on the clock already. CHRISTINE: So just to reiterate what you just said. Basically, if you're seeing ants and you're seeing sawdust where you didn't create the sawdust, you probably have carpenter ants and that's when you should call an exterminator. Otherwise, you might want to try some DIY methods to get rid of the ants before calling a pest control expert. DOUG: Yeah, there's definitely different types of ants, but the differences between them aren't really going to affect much of the approach that you're going to take to get rid of them. ROSIE: And then for the difference between cockroaches, it doesn't matter what type of cockroach it is, you're going to deal with it in the same way. DOUG: Correct. CAIRA: Are there particular places that roaches versus ants like, dark versus light or wet versus dry, anything like that? DOUG: Definitely. So ants are going to tend to just go where the food is. The telltale sign of ants is ants. You're just going to see the little trail of ants. You'll see them walking in a row. It can be easier to find out how they're coming in. You just sort of trace their little trail back as far as you can, and then look around the foundation of your house. If they're coming from outside, they may just be in your walls too. Roaches on the other hand, roaches love, and this is a phrase used in the pest control world, is cracks and crevices. So, a roach is extremely happy if they have their feet on one surface and their back is against another surface. You want to look for them in tight little spots. So right between the stove and the cabinetry, a little nook like that, they love being around the refrigerator because the fridge actually provides a good water source too. There's condensation from the compressor unit or maybe the gasket on the fridge door isn't really tight, so there might be some condensation there. Cockroaches, they love cardboard too. They raise them in cardboard when they raise them in labs. ROSIE: Why is that? DOUG: Well, because it just provides so many of these little... ROSIE: Little crooks and nannies? DOUG: Little cracks and crevices, yeah. ROSIE: All right. So Doug, how many bugs in this case, maybe roaches indicates a problem if you see one, do you have an infestation? If you see one ant, does it mean you have more ants? What's the guidance there? DOUG: Yeah, I would say if you have one ant, if you see one ant, you should start thinking about doing something about it. Ants really don't operate on an individual basis, so you're not going to have just one, and roaches do not live in a colony the way ants do. But still, even if you have one roach, I think it's worth dealing with. CHRISTINE: This might be an old wives tale, but I have been told as a city dweller that if I see a really big cockroach, it's not as big of a problem as if I see a little tiny cockroach. CAIRA: I've also heard this. DOUG: Really? ROSIE: I've also heard this, but I knew even while I was being told, I knew it was a thing that they tell you so that you can sleep at night. CAIRA: Is it? ROSIE: I mean, Doug, is it? DOUG: I don't know, I haven't heard that. ROSIE: You've not heard that, so I think that's something that you would hear. CHRISTINE: Yeah, I've been told, I had a friend who had a really bad roach infestation in their apartment and they had all these tiny little roaches and it wasn't like big ones. It was just like a bunch of little ones. CAIRA: I've lived in a roach-infested apartment before and I can corroborate that. They're always the small ones. ROSIE: I have also lived in a roach-infested apartment, and they were small and they were medium and they were big. CAIRA: Well, lucky you. ROSIE: My poor brother, his old house, they were big and they were bigger and they were biggest and it was an infestation. And so I don't know if I buy that. I do, I like this idea of the individualist roach, the Ralph Waldo Emerson. CAIRA: So once you figured out how the bugs are getting in and what you're dealing with, then I'm guessing it's time to clean because that usually seems to be the right answer. This is also an important step in getting rid of rodents, but what's more important here? Are you cleaning out crumbs in your kitchen or putting food in airtight containers? What's the order of operations here? DOUG: I would recommend both. You want to give your kitchen a really good cleaning, and then at the same time, you want to make sure that your food is protected, especially roaches. If you keep a little honey jar on your counter, that's going to be highly targeted by ants. So I would find a new way to store that. CHRISTINE: To this cleaning point. Going back to my friend who lived in this roach-infested apartment, they kept things really clean and they could not get rid of this problem. After a while, they discovered that their landlord was keeping all of the yard trimmings in the basement, and it was just creating this area for all of these roaches to just chow down. So, keeping things clean in your entire home is key here right? DOUG: Yeah, and that's the difficulty with living in an apartment or a condo. You're only as good as the entire structure, really. ROSIE: Yeah. What do they eat or what do they like to eat? You mentioned dog food is what they feed them when they're growing them in a lab, but are they going to essentially eat anything and drink any water source they can find? DOUG: Yeah. Ants typically have more of a sugar diet. It actually... It can change over the course of a year, but during the summer typically have a sugar-based diet and they may switch to more a protein-based diet in the colder months. But roaches are more consistently a protein-based diet. CHRISTINE: They're little weight lifters. DOUG: They are. ROSIE: And then what about water? You mentioned the refrigerator. Is this also why you're finding roaches in and by a sink and in and by a shower tub and drain, that kind of thing? DOUG: Yeah. Roaches, they can go quite a while without eating. I think they can go weeks without eating, but they can only go a few days without drinking. So they're going to definitely focus in on a water source, which again, like I said, it's why refrigerators provide a good opportunity for them because they not only get those small cracks and crevices, but they typically can get water there too. CAIRA: But what about your sink? When you finish doing the dishes at the end of the night, are you supposed to wipe it down dry too? How do you keep them out of sources like that? DOUG: You could try and do that. I mean, you just really got to do the best you can. I mean, if that means squeegeeing down your sink, I guess you could give that a shot. CAIRA: Yikes. ROSIE: So the next step is to seal up holes. What is the best way to do that? DOUG: Well, the best way to do that, like I said, with ants, you can often find the trail of ants and you can trace it back maybe if you're lucky to where they're getting in the house. It's a matter of going around the outside of your house, looking at the condition of your foundation, usually where the framing, where the wood meets the foundation, there can be gaps there. Or if you have a field stone foundation like I do, that actually can be very, very difficult to patch up. But you want to just take some heavy duty caulk and just kind of fill the holes best you can. A good silicone caulk will be good, especially if it's on the outside of your house, that's going to provide more flexibility for the freeze and thaw expansion, contraction that your house goes through. ROSIE: So to recap what you're going to want to do here, and this goes for roaches, this goes for ants. Observe what the bugs are, identify them and identify where they're coming from. Find where they're coming into your home, where they're spending their time. At least you will know the source, and this can be much easier said than done, but that's going to be your first step. The second step, clean up. Clean, clean, clean. Food, put food away, airtight seal it, seal up your cracks that you can see. And finally what you're going to want to do is use a bait. We're going to get into that with Doug after a break, and we'll also ask about why people should avoid certain pest treatments. And if it's time to stop faffing about and call a pro, we will be right back. CAIRA: Welcome back, Doug. Before the break, we talked about the first steps in combating an ant or roach infestation, but now let's talk about bait traps, which is what you'd recommend for both ants and roaches, right? So what exactly is a bait trap and how does it work exactly? DOUG: So a bait, a bait is a mixture of food and a slow acting poison. And the theory behind it is that in the case of ants specifically, they'll collect the food and then they bring it back to the colony and they distribute it. So that ultimately kills all the other ants, and then eventually the queen. The models bait comes in a bunch of different forms, we prefer the ones that are, they're called bait stations, which is like a little box that the bait comes in. The one unusual part about baits is that if you start seeing more ants, it might be a good thing because that means that they found the bait station. The toxin is mixed with an extremely attractive food. So once they find it, they'll just usually start lining up to get at it. CAIRA: Oh, poor little guys. DOUG: And so roaches, like I said, they don't live in colonies, but they share the bait amongst themselves using other ways. What roaches will do is roaches might vomit and another roach will eat it. ROSIE: Poor little guys. CHRISTINE: If they weren't appealing enough to begin with. CAIRA: No, no. DOUG: Roaches, they may eat each other's feces. ROSIE: Poor little guys. DOUG: Or they may just die and be cannibalized by another roach. ROSIE: Poor little guys. CAIRA: It's like The Road out there in the roach world. CHRISTINE: Yeah, it is like The Road in roach world. CHRISTINE: So it sounds like, okay, ants and roaches, they live in different types of communities. Are the traps themselves the same or are they different because it sounds like they eat slightly different foods. DOUG: A bait station made for ants is not really going to attract roaches. So it's two different products, there's two different toxins and two different food sources. The general theory is the same, but the details are not. Ants go for a sweet diet, so the food that's mixed with that poison is sweet almost, but it seems like it's a honey or a maple syrup. It's a very liquidy, very, very sweet thing. And then the roach one, it's more of like a paste. It's more of like a protein-based. ROSIE: Like muscle milk. CHRISTINE: That's right. Muscle milk for those little weight lifters. What traps do you like? What bait stations do you like for ants and roaches? DOUG: We like the ones from Terro. Terro makes liquid ant baits, and they also make roach baits. Their liquid ant baits are notable. There is in all the product reviewing and testing I do, it is rare to find as much consensus as there is about how well the Terro ant baits work. When I was looking at all these ant baits, I set maybe five or six of them out when we had our own ant problem and all of the ants, they went right to Terro and they cleaned that one out. And all the other ones, all the other bait stations were right next to it. So, I'm not sure what they put in their little sugary mix, but whatever they do, it is highly, highly effective. We have a number of colleagues who have had really good experience with Terro ant baits too. CHRISTINE: Okay. So you've gotten a little bit into how you test these. Can you tell us more? You said you don't have cockroaches, so how are you testing those? DOUG: We test, when it comes to all sort of our ant and pest control, for the most part, we don't test for efficacy, we test for usability. So, we'll get the products in our hands and we'll use them as anyone would use them, see which ones in the case of bait stations, which ones are easier to monitor, which ones are easier to open, which ones are just generally easier to use, how many you get in a pack, that sort of thing. But it just does not make sense for us to do efficacy testing on this. There's just too many variables involved as far as what season it is for the ants, which ants you're trying to get rid of, which roaches you're trying to get rid of, what their specific diets are. So there is a huge body of literature already out there as far as the effectiveness of different toxins. We look at that and then we also speak with pest control operators, we speak with entomologists, we speak with people at extension offices and get their input as well. ROSIE: So again, are roaches and ants going into these little poison homes and that's how they're getting the bait and then taking it out and then coming back and doing the same thing over and over? DOUG: Yep, that's exactly it. ROSIE: Fun. DOUG: And in the case of ants, you'll just have a line of ants going across your kitchen right to the bait and then a line of ants right next to it going back to the colony. ROSIE: So then, where are you meant to put the traps, particularly if you don't, I mean obviously you put them where the source is, but if you don't know, how do you figure that out? DOUG: Well, you really want to put them sort of where you see the bugs. It's not going to make much sense to put them in the middle of your room. So along the baseboards would be good. Or on your counters if that's where you see ants. With roaches, you can put them around, like I said, around the refrigerator. You can put them in places where there are those cracks and crevices. ROSIE: You mentioned the countertop. Do these bait traps pose any risk to kids or any risks to pets? Should people be careful where they're placing them for those reasons? DOUG: Well, as with handling any kind of toxin, you definitely want to be aware with kids and pets. I will say the ant baits, their active ingredient is borax, which is commonly used as a laundry detergent. So that is about, it's about as benign as it gets, but it can spill out and you don't want your dog eating it up, you don't want your kids drinking it. It comes in different forms. We like the bait stations because it's a little more contained. Roach baits, they use a stronger active ingredient, but it's a thick paste and it doesn't easily fall out of the bait station. So that one is a little safer as far as if a kid goes over and just picks it up or if a dog knocks it over. CAIRA: From your reporting, Doug, I know that there are other types of pesticides that you could use like gels and powders, but when would you go for one of those? DOUG: Well, what we've been talking about are bait stations, and so that is when, like I said, the bait comes in a little compartment, but most manufacturers, they'll sell the same bait, the same mixture of the poison and the food, but they'll sell it in just a different format. So, you can often get them in a powder or in a gel, and that can work depending on the situation. So especially with cockroaches, the gel is sticky, so you could kind of smear some maybe on the side of a cabinet that's near your stove or it's just not a place where you want to put a bait station. You could do a little bit of the gel. The powder it comes in, you could just puff a few little bits of this powder underneath the refrigerator. We find that they're harder to use, they're harder to monitor, and they're a little tougher around kids and pets. So we prefer the bait stations. ROSIE: I remember when I had a roach infestation, I remember feeling like anything that has any kind of review, I want to get it and I want to pour it all over the apartment and I want to do everything at once. Is there any detriment to doing more things, reaching for more than one type of bait or type of solution at once? DOUG: No, not really. I mean, I think it's a fact that there's no one product that's always going to work all the time. And I think one of the things to keep in mind in approaching this is to always have the flexibility to switch to a different product, a different active ingredient. There are times when the bugs will have just an aversion to a bait for whatever reason, but that doesn't mean that they'll also be averse to one that comes from another company or one that uses a different active ingredient or has a different recipe. ROSIE: But by the same token, whatever you choose, you want to give it the time to work? DOUG: Yup. Maybe a week or two and see how it's going. The Terro bait station, one thing we like about them is that they're clear, so they're really easy to monitor. If they're working, you'll see some ants that drown themselves in there, so you should know if it's working, you'll be able to see. CHRISTINE: Okay, so we've talked about bait stations, we've talked about gels, we've talked about powders. There are other types of products you can treat ants and roaches with. What are some of those and why don't you advise using them? DOUG: Yeah, so there's the kill on contact sprays. Those are not going to do any good because you're just going to be killing the ants that are right in front of you. And that, as we know, is not going to affect the colony, and it's really not going to change the behavior of the ants. What's more is I've been told that you can, if you use those kill and contact sprays, that you can actually split the colony, and so then it'll make the infestation worse. There's also bug bombs, which are those foggers, which you set a bunch of them off in a room and then you vacate the room or you vacate your house. Those don't tend to work, they don't tend to get into the cracks and crevices where cockroaches live. And then there is even a story where somebody set a ton of them off and they use butane as part of the mixture in the aerosol can, and then I think it might been, there might've been a spark from the stove or from the fridge or something, but I believe the entire house blew up. CAIRA: Oh my God. CHRISTINE: Oh my gosh. CAIRA: I mean, they solved the infestation problem. ROSIE: That is dark. So, are those kill-on-contact sprays not good for roaches either? DOUG: It may not get all of the roaches. I think the bait, it's going to be a more passive way and have a better chance at getting all of the roaches. ROSIE: I'll tell you what, I was walking around the house with a holster and keeping raid in my pocket, and I was just like, because you see one of these in the daytime, and you're not going to be like, well, I guess I'll just take myself into another room and hope that the bait works overnight. You're screaming and then spraying this thing until it flips over on its back. So I don't know, I don't know what my question is. I'm clearly still haunted. DOUG: They can certainly be added to your arsenal, but I think that it would be in conjunction with a bait. ROSIE: Got it. CAIRA: So Doug, on TikTok, I sometimes see "non-toxic" ways people can deal with bug problems, like things like tea tree oil, vinegar, and I even saw something called Diatomaceous earth, which is like a white, chalky substance made from fossilized sea creatures. I don't know why I bought it but I did. It's supposed to be one of these natural remedies that keeps ants and roaches away. I want to know your thoughts on that. DOUG: Yeah, there are definitely, with essential oils, there's definitely a lot of essential oils that have bug repellent capabilities. The problem with essential oils is that their effectiveness does not last very long. Diatomaceous earth can be very effective. It's a very, very, very fine powder. It's often just a messy alternative to deal with. They have to actually walk through it and get it on their bodies for it to work, it's just a little trickier. I know anecdotally, there's a lot of people who swear by Diatomaceous earth, and I'm sure that it works to a certain degree, I believe it dries them out. But again, it is just a messier option where I think a bait is probably a little just easier to deal with. CHRISTINE: So if you are dealing with bugs, you want to do what we talked about in the first part of this episode. You want to identify, you want to clean, and then you want to seal up any holes, and then you want to turn to bait traps and you want to get different kinds for ants and roaches, bait traps are generally going to be the most effective. You can also use gels and powders that have some of the same insecticides in them. But Doug, you recommend avoiding instant kill aerosol sprays for ants because it can make the infestation worse if you split the colony. You might want to consider using them for roaches if you're looking for an extra little gung ho treatment there, you recommend avoiding these total release foggers, these bug bombs because they're not that effective and they can also be dangerous. And then also, you might try some of these natural treatments, but they're not going to be as effective as the traps. DOUG: Probably not. Baits are really the standard, especially with ants, I would say with cockroaches too. It's a very reliable, and it doesn't really get you in contact with the bugs. It's actually a fairly clean way to go about it. ROSIE: So you've done all of these things that Christine just mentioned. It's not working. When is it time to call an exterminator, Doug? DOUG: Well, that's sort of your call, your comfort level. If you want to keep trying something else, but you don't want to let it get even further and further out of hand. So, I would say once a couple baits are out, I'd monitor them for a couple weeks or however long you can handle it. Definitely don't be afraid to just call it quits and call it pest control operator. ROSIE: Doug, it's time you get in the hot seat. We're going to test you. DOUG: Really? ROSIE: We started this with you quizzing us. It's only fair we return the favor. So we're going to play a little round of, would you rather, oh boy. CAIRA: I'll start. I've been thinking about this. I've been thinking about how I want to test you. Would you rather eat chocolate covered roaches or chocolate covered ants? DOUG: Chocolate covered ants, they're smaller. ROSIE: Would you rather have roaches that could fly, or ants that could bite? DOUG: I would probably go flying. Biting ants sounds awful. CAIRA: Yikes. Okay. Would you rather have a roach infestation or a rat infestation? DOUG: Ooh. I would say, that's tricky, that's tricky. I have more experience with rats, so as gross as it is, I would probably rather have a rat infestation because I know... CHRISTINE: The enemy, you know. DOUG: I know the enemy. ROSIE: Okay. So before we wrap, Caira usually asks all of our guests one final question. What's the last thing you bought that you really loved, but because Doug is a regular and more than that, because Doug famously doesn't buy all that much of anything, we're going to spare him and just say, Doug, you're wonderful. Thank you for coming back, thank you for humoring us and haunting us. DOUG: Well, it's a pleasure to be here. Thank you. CHRISTINE: Well, that was thoroughly disgusting. Yuck. ROSIE: I'm kind of surprised we made it through. CHRISTINE: Yeah, I mean, but we're done. We're not going to do any more of these, we promise. CAIRA: Yeah. I'm going to just like all the other ones that we did that are this level of disgusting. I'm just going to blank it out, it's going in the vault, I'm never remembering any of this. ROSIE: I do feel like we bonded through some shared misery. CHRISTINE: Yeah, I know what to do the next time I see the little trail of ants in my apartment or the rogue cockroach. For me personally, I now know that if I see one cockroach, it's a problem. I always thought if there was just one rogue one, it had just wandered in. But now I know that they might be nesting around the pipes in my sink and behind my refrigerator and all that good stuff. CAIRA: You know what? I actually think ignorance is bliss, but if I do see another roach or just before that, I think I'm just going to get some bait traps for roaches and ants just to be safe, because I actually live in a ground floor apartment. I've been lucky so far, but I don't want to risk it. ROSIE: I hope you stay safe out there. My big thing, it's annoying, but it's clean. It's clean, clean, clean, clean, clean. Having said that, when I had the roach problem, and actually I had an ant problem too in a previous apartment, we cleaned and it didn't make a difference, and we had to call a professional. So, don't be a hero. CHRISTINE: That's right. ROSIE: If it's not working, call someone for help. CHRISTINE: That's right. Give it a week or two with your bait traps and then call the pros. ROSIE: If you want to find out more about Wirecutters coverage or if you want to check out Doug's reporting, head to our website. You can also have a look at our show notes. That's it for us. Sorry for creeping y'all out. See you. Thanks for listening. CHRISTINE: Bye. CAIRA: The Wirecutter Show is executive produced by Rosie Guerin and produced by Abigail Keele. Engineering support from Maddy Masiello and Nick Pitman. Today's episode was mixed by Catherine Anderson. Original music by Dan Powell, Marion Lozano, Elisheba Ittoop, and Diane Wong. Wirecutters deputy publisher is Cliff Levy. Ben Frumin is Wirecutter's Editor in Chief. I'm Caira Blackwell. CHRISTINE: I'm Christine Cyr Clisset. ROSIE: And I'm Rosie Guerin. CAIRA: Thanks for listening.

Want to Start Gardening? These Wirecutter-Approved Tools Will Help You Feel Like a Pro.
Want to Start Gardening? These Wirecutter-Approved Tools Will Help You Feel Like a Pro.

New York Times

time6 days ago

  • New York Times

Want to Start Gardening? These Wirecutter-Approved Tools Will Help You Feel Like a Pro.

This rake is sturdy, well balanced, favored by professional landscapers, and good for years of use. It's well built, though it might be a little heavier than rakes made with bamboo. Fall leaf cleanup is prime time for a fan rake, but it's useful year-round for everything from cleaning up lawn clippings to gathering cuttings from overgrown hedges. We like the Ames Jackson Hardwood/Steel Handle Steel Leaf Rake because it's surprisingly sturdy for the price, and the steel tines have enough give to easily comb through thick grass while still snagging loads of yard waste. If your yard has a lot of tree cover, you'll probably break down and buy a leaf blower at some point. Even then, you'll still find ways to use your old rake. You might also want a bow rake. This type of rake has shorter, stiffer tines than a fan rake, which makes it excellent at smoothing out a bed full of mulch. For finer material, like finished compost or soil, you can flip it around and use the backside for the same task. Somehow, we don't have a bow rake recommendation at Wirecutter, but we have a few avid gardeners and homesteaders on staff who say that they've never noticed much difference between any of the bow rakes they've used, apart from the benefits of a lightweight, durable fiberglass handle. This self-propelled lawn mower has a battery that runs for an hour, and it easily mows down overgrown grass. It also spares you the noise, emissions, and maintenance of a typical gas mower. $620 from Walmart May be out of stock This category almost seems too obvious to include, but if you have grass, you need a way to cut it, and the best tool for most lawns is a battery-powered lawn mower. A good cordless mower is much better than any gas option: It doesn't need fuel, it doesn't emit exhaust, and it requires minimal maintenance. In our tests, we found that the Ego LM2156SP Power+ 21″ Select Cut XP Mower was great in just about every way: steering, charging, run time, and mowing power. You might want to choose a different format if you have a very small or very large lawn, but most people should start their search here. Mowers can't reach everywhere in your yard, and that's where a string trimmer comes in. It's the quickest way to clean up overgrown grass along fences and around posts or knock down an overgrown but otherwise unmowable area. And most string trimmers let you reuse the same battery and handle with a load of other powered yard tools, such as hedge trimmers, pole saws, tillers, and more, so you'll get a lot of mileage out of the initial purchase. The Ego ST1511T Power+ 15″ Powerload String Trimmer was among the strongest and quietest string trimmers that we tested, and Ego's battery platform (which also works with our mower pick) is truly excellent. This article was edited by Megan Beauchamp and Maxine Builder. Spend more time enjoying your yard and less time working on it with these Wirecutter-expert–approved tools and gadgets. I love gardening. I hate weeding. Thankfully, I have my trusty hoe by my side. It's sensible, mostly polite, and the most powerful cordless leaf blower Wirecutter recommends.

Optimize Your AC
Optimize Your AC

New York Times

time6 days ago

  • New York Times

Optimize Your AC

CHRISTINE: I would love for you to explain, in the simplest terms, how AC works. THOM: Sure, so there's a little fairy inside the box. Okay. CHRISTINE: I'm Christine Cyr Clisset. CAIRA: I'm Caira Blackwell. ROSIE: I'm Rosie Guerin, and you're listening to The Wirecutter Show . CHRISTINE: This episode is called Optimize Your AC ROSIE: Hello. CAIRA: Hi. CHRISTINE: Hello. ROSIE: Welcome to another episode of The Wirecutter Show , Caira and Christine. CHRISTINE: Oh. Well hello, Rosie. CAIRA: Why are we talking like this? ROSIE: Today is a serious topic. CHRISTINE: It's hot. ROSIE: It is hot. CHRISTINE: It's so hot. ROSIE: It's so hot. And actually, let's get serious about talking about cooling off your house. This is the time of year I have to start prodding my super to install our AC window units, because it is so hot. CAIRA: My super never offered to uninstall and install my AC units. ROSIE: I think it's a liability thing, which honestly I'm glad, because I never felt confident about throwing those units in and slamming the window down. CAIRA: Yeah. CHRISTINE: My husband does it, and I just leave. ROSIE: I don't have one of those. CHRISTINE: I'm like, "I'll see you later." ROSIE: I don't have- CHRISTINE: Oh, well yeah. ROSIE: I have window units, but not a husband. CHRISTINE: But you have a super. Well, I grew up without AC. I'm from the Pacific Northwest and a lot of people in the Pacific Northwest do not have AC. And that is becoming a bigger issue, because it's getting hotter. A lot of people don't have windows that will fit a window AC, and a lot of people don't have central AC. So it can be really tricky. ROSIE: I remember in the dead of summer, having to rely on the window fans that my dad would install in my bedroom. CHRISTINE: Oh, yeah. ROSIE: This was before we had central air, and it was like, "Yeah, that was what we had." CHRISTINE: Yeah. We have a lot of coverage on our site around air conditioners. We have guides to window units, and portable units, and split units, which we're going to talk about in a little bit. But we also have a lot of coverage around how to keep your home cool even if you do not have AC, and there's a lot of different strategies you can use. CAIRA: Yeah. So today on the show we're going to talk with staff writer Thom Dunn who reviews all kinds of air conditioning units. He's going to walk us through how window and portable units have become a lot better over the past decade, and he'll also share some strategies that anybody can use regardless of the type of AC they're using or if they have it to begin with to keep their home cooler. CHRISTINE: And we're also going to talk with senior staff writer Liam McCabe about heat pumps, which can replace a traditional AC system. These can be a beneficial investment if you're a homeowner considering an upgrade to your heating and cooling system. ROSIE: And a bit later, we'll tell you about a recent recall of Wirecutter's favorite window AC, the Midea U. Christine will lay out how to figure out if you have a recalled model at home and what you can do about it. We'll be back after a break with everything you need to know about AC's with Thom Dunn. Stick around. CAIRA: Welcome back. With us now is Thom Dunn, who is a staff writer who focuses on heating, cooling and humidification gear. He's tested over 100 ACs and fans for Wirecutter since 2017. For our window AC guide alone, Thom has tested over four dozen AC units, and he's manually installing them in his home in the muggy Boston Heat himself. CHRISTINE: Welcome to the show. THOM: Thank you for having me. ROSIE: God's work, Thom, God's work. Thom, how are you testing all of these window AC units in your home? Is it like you have 48 windows and 48 AC units? THOM: The first year I tested this, we actually lived in Ithaca, New York, and I had an extra guest room that had three hung windows in it. That's the kind that vertically slides up and down. And I think my neighbors thought I was a psychopath, because I had three ACs stacked in all the windows of one bedroom. At our home now, I have exactly one hung window. So my spring is a nice frantic ballet as I wait for the weather. And I have all the ACs ready to go to pop them in there, and I take my first round of tests as quickly as possible as the weather permits in April and May. Once I can identify the best of the ACs I have, I can start to really dig in deeper on various metrics and various experiences that I like to look for as I test them to figure out which ones are the best. ROSIE: What are the metrics? THOM: Generally speaking, most window air conditioners, the specs that you get on the box, on the Energy Star label or whatever are usually pretty accurate. They tell you what the energy efficiency is, they give you an approximate power level and room size. That's usually all pretty accurate because Energy Star tracks that stuff and that's great. So what I try to do is I measure the noise level with the fan, and the different fan settings with the different compressor settings. I don't just measure the volume. I have a spectrometer on my phone so I can see what kind of frequencies are spiking here and there. So I'm like, "Oh, that one, I was just testing one right before this call, and I noticed that when the compressor was on it added 10 decibels just on the low end, and I had these really annoying spikes." So I could look at the spectrometer and be like, "Oh yeah, that's that whining thing in my ear that's making me want to hit myself in the head." That's what that sound is. And I take those notes. And while I do that, I also, I have it plugged into an energy consumption monitor so I can track how much power it's using. ROSIE: So you're actually measuring the energy output, you're measuring noise level. What else makes it into the metric? THOM: So then I also have a few monitors set up around my office so I can track over the course of several hours how the temperature and the humidity changes. The general testing process is that I will let them run for usually about two hours, and I leave the monitors, one about three feet away and one about six feet away on a diagonal and I track all the changes in temperature and humidity. And I go back and look at that and be like, "How well is it moving air around the room? How quickly did it cool the room?" And the whole time I do that, I am sitting in the room taking notes anyway, seeing how comfortable... Maybe I thought a fan was loud at first. But then when you're sitting in the room you go, "Yeah, no, that's okay." Sometimes you sit in the room and you think it's a great air conditioner, and then you go, "Why am I so uncomfortable right now?" And then you start digging in more to figure out what about this one is making me feel miserable? ROSIE: Is user experience part of the testing as well, just in terms of how you get this in and out of a window if it's a window unit, or how you have to maintain it if you need to maintain it at all? THOM: User experience is definitely a factor. It is a funny catch with ACs, because I think as a general rule we can expect that they're all miserable to deal with. They're all cumbersome, they're all heavy. None of them are fun to lug into a window and pull the top window down quickly to hold it in place. Some of them are worse than others, and some of them are better than others. Our long-running, what's our budget pick now, is this Frigidaire model. I look at that as the most perfectly mediocre air conditioner you could find. ROSIE: It's the one to beat. THOM: Yeah, that's our budget pick at the moment. We've recommended it for years, because it's perfectly fine. And that's the metric point I use for how easy is this one to put together and install, or how easy are the controls here? CHRISTINE: Thom, I would love for you to explain in the simplest terms how AC works, because it's just like magic. There's cool air that comes in, it's great, but I actually don't know what's happening inside the machine. So can you just explain how AC works? THOM: Sure, so there's a little fairy inside the box. Okay. So you AC, whether it's... Whatever kind it is, it's basically sucking in the air from the house, and then it drags it over a coil of refrigerant, a chemical that gets really cold. As it drags the air over the cold coil, that cold coil pulls out some of the heat particles and some of the moisture, like when a cold cup sweats in the summer. So it collects the heat and the moisture on the cold coil, and there's this whole refrigerant compression and then condensing process. But the TLDR version is that there's a fan that then takes the moisture and the hot air and blows it out the back. And then another fan that takes whatever's left and throws it back into the room. CHRISTINE: So it's like this cycle. Pulling in the hot air from inside your home, cooling it off and then spitting out the cooled air back into your room and all the hot stuff back outside. THOM: Yeah, that's right. CHRISTINE: Okay. And it doesn't matter what type of AC you have, whether it's a window unit, a portable unit, central air, any kind of AC works in the same way. THOM: Correct. ROSIE: What is the difference between a window unit and a portable unit? THOM: An air conditioner in general is whatever conditions your air. And that could be your central HVAC system, it could be a heat pump, it could be a window or a portable air conditioner. Window units require a hung window. The hung window helps to keep the window AC in place, so that's a requirement. Half the unit is in the house, half the unit is outside, so you get the good stuff on the inside and the bad stuff all goes outside. Not everyone has a hung window though. There are all kinds of different windows, or for various reasons you might not be able to put a window unit in your hung window even if you have one. CAIRA: But my house upstate has windows that open left to right. THOM: Those are not hung. In that case, you would need to use a portable air conditioner. And portable air conditioners are a bit more adaptable. That's the good thing about them. They often come with these window kits that can fit into all kinds of different other window settings. You can really make them work in a lot of different scenarios, including in a hung window. The trick with the portable AC though is that they're not as efficient as a window unit. First of all, you have a big R2D2 looking thing that has to sit there in your room and it takes up space. There's also the fact that it has these clunky octopus tentacle hoses that have to pump the air out the window. So you have to exhaust some of the air, and by basic physics of mechanics, when all the hardware inside the air conditioner is working, it produces some heat. So the portable AC is now sitting in your room producing heat, radiating heat out of itself, and then you're also trying to cool the room. But by trying to cool the room, AC itself is working against itself by heating up. And then it also has to push the hot air that it's removing from the room out of the tubes and out the window. But even then, you're starting to lose some of the hot air as it moves out of those tubes and that it leaks into your room. So the portable AC is kind of fighting against itself. Whereas when you have a window air conditioner right in the window there, it's pushing the cold air into the room and it's pushing all the hot air and mechanical heat radiation out the back outside. CAIRA: Most of the window and portable units that Wirecutter recommends, that you recommend, Thom, use something called an inverter compressor. You see that word all over the guides. What is that, and why is it important, and how does it actually make an AC more efficient? THOM: The compressor is the part of your air conditioner that when you turn it on and you hear it in the background go, that's the compressor. What that does is it helps transform the cold refrigerant from a liquid into a high pressure gas, which you can then expel outside along with all the other hot air it collects. Historically, these compressors had two modes. They were on or off, zero or 100%, and that's why it made that annoying noise. A lot of people complain about their older air conditioners that when they start you're like, "Oh, it's on. Okay, I hear it." Because there's the fan, and then there's just that low rumble and it just kicks on and it's annoying. An inverter compressor works more like the gas pedal on a car. You can push it all the way and really throttle up, or you can slowly ease on the gas and you don't ever have to stop the car completely. It's energy efficient, and it's much, much, much more pleasant. CHRISTINE: And it's more energy efficient, Thom. Is that because if you're fully stopped and then to restart and get up to speed, whether you're in a car or whether you're getting up to speed and the machine is running, that takes more energy than just running at a low level all the time? THOM: Exactly. It takes a lot more energy to start and get into motion, whereas if you were already in motion, you'd keep going. ROSIE: If I have an older AC unit without an inverter compressor, it sounds like I should consider upgrading it. THOM: Yes and no. Generally speaking, I'm against upgrading your air conditioner unless you absolutely have to. Maybe that's just my larger environmental concerns. You have these chemical refrigerants which are not good for the planet. You don't want to dump those into the town dump. You have all this metal and styrofoam. But if your machine is hurting, if it's not cooling the air and you need a new air conditioner, I would absolutely recommend looking for an inverter model whenever possible. CAIRA: Well, I remember in my first apartment in New York, it was a three bed, it was tiny. But for whatever reason, the only AC unit that my dad thought to give me was 100 pounds, huge. We carried it up six flights of stairs, and we decided to put it in the living room. It overly cooled the living room, and all of the bedrooms stayed hot. And I just wonder what size AC unit should I have gotten for that apartment to make it a livable space? So I know that AC units come in all these different sizes, but how do you know if you're getting the right size? THOM: Right. Well first of all, in that situation... So your living room was cool, right? CAIRA: Yeah, it was freezing. But the bedrooms were all steaming. THOM: Okay. The trick there is you should have left the doors open during the day and had some fans running. CAIRA: Oh. THOM: That could have helped a lot. I know you have roommates, you don't want to- CAIRA: We all just basically live in the one room. It's just all the doors are open. THOM: Right. I do understand that, and that puts you in a weird spot. So that way it wouldn't be miserably cold in the living room and it would spread that air around. But on a larger scale, the answer to that question, ACs are typically sized in BTU, British thermal units. I don't know why. CAIRA: The Brits. ROSIE: Colonialism. THOM: Yeah, I don't know who in Britain invented this necessarily, but it is the amount of energy needed to heat one pound of water by one degree. Most of these air conditioners that you'll find today give a room size recommendation. So we typically test using 8,000 BTU models. 8,000 BTUs are usually recommended for rooms of 250 to three 50 square feet. I'm guessing, Kyra, that your dad got you a 12,000 BTU AC for that room. ROSIE: It was huge, Thom. THOM: I'm going to guess, which is usually for 450 or 500 square feet and up. CAIRA: Our entire apartment was probably 300 square feet total. THOM: Right, you lived in New York, I get it. It can be tempting to be like, "Oh, cool, this one's bigger and colder." But that is a temptation you should resist. Last year, I started wondering about this because they were so much cheaper, especially I found that Costco always had sales on huge versions of our picks. And what I found, I did some tests last year. I was testing one of the 12,000 BTU units in my office space. I was so miserable. I went and grabbed a hoodie. And I was sitting here and I was like, "Okay, it's July, it is 85 degrees outside and I just went to get a hoodie." My office felt like I was in Ireland. I just felt damp. And that's because the larger ACs can do a worse job of removing the moisture from the air. So they will do a fantastic freaking job of just cooling your room really fast. Your room goes from 80 to 60 and you're comfortable. Great. You think, except the humidity in the room has barely changed at that point, and now you are feeling clammy, and you are feeling damp and it sucks. CHRISTINE: So basically, Thom, to keep your home at a comfortable temperature, you should get an AC unit appropriately sized for your space. And if you're finding that you're not feeling comfortable in an air conditioned room, it may be a humidity issue? THOM: Yeah, the ACs direct some of their energy to cooling and some of it to moisture removal, and the larger ones just can't remove as much of the moisture as quickly. I will add, a lot of the air conditioners come with built-in dehumidifier modes, and a lot of them also have some sort of auto setting. And for most people actually, especially if you have an inverter model, I actually recommend just leaving your AC pretty much all summer on the auto setting. Because that way there are some days where it's not that hot but it's really humid, and the AC will flip over to dehumidify mode and actually cool you down. ROSIE: So to that end, Thom, the $100 million question, do we need to be turning our AC off when we leave the house or the apartment to save energy? THOM: No. Not necessarily. As far as your own energy bill use goes, you can actually save money by leaving your air conditioner on. I did a piece last year. I set up air conditioners in three units stacked in my building across the course of several days during a heat wave. And for some of the days I turned the ACs off during work hours, air quotes, and then turned them back on around four PM before people got home from work. And then the other days I left them running all day at a higher temperature. And when I left it running all day, it used a lot less energy and it was ultimately more comfortable. So if you really want to save the energy and be more comfortable, you want to just turn your AC up a little bit when you're not home. ROSIE: That's very surprising. CAIRA: Hot take. CHRISTINE: Yeah. ROSIE: And a very hot take. THOM: I'm going to get so many angry emails again. And you know what? I stand by it. CHRISTINE: So for folks listening at home, if you're in the market for either a window unit or a portable unit, which is not as great as a window unit, you might want to think about an inverter model that has an inverter compressor. And all of us should be thinking about just keeping our ACs on instead of turning them off. It can be more energy efficient that way, especially if you're using an inverter compressor. CAIRA: But also get an AC unit that fits the size of your room. CHRISTINE: Exactly. THOM: Bigger is not always better, folks. CHRISTINE: Okay, so we've covered the basics of portable and window AC units. But for some people listening at home, you may not have a window unit or a portable unit. Maybe you have central air, which is when your heating and cooling runs through duct work in the walls or the ceiling. Or maybe you have ductless mini splits, and those are the units that are mounted onto a wall, or a ceiling or the floor that also serve as both a heater and an AC unit. So if you're a homeowner, you may end up coming to a cross in the road where you have to decide whether you're going to upgrade your AC and your heating. And oftentimes today, that means you're going to be talking about a heat pump. So we're going to actually take a break right now, and when we're back, we're going to bring on another one of our colleagues, Liam McCabe, to talk to us about heat pumps and why someone might want to consider one if they're about to upgrade their HVAC system. And then Thom, we're going to have you back, and we're going to talk a little bit more about what anyone can do to keep their home cooler. Whether they are using AC, or whether you don't have AC and you're just facing a heat wave and you need to figure out how to keep your home cool. We'll be right back. CAIRA: Welcome back. This episode is all about keeping your home cool this summer. Earlier, we talked with Thom Dunn about what you should know about window and portable AC units, which are a great solution for people who don't have central air or split units. We're going to come back to Thom in a bit. But right now, we're going to focus briefly on what homeowners should consider if they're thinking about upgrading their cooling system. CHRISTINE: That's right. And for that, we're going to welcome another Wirecutter colleague, senior staff writer Liam McCabe, to tell us about heat pumps, what they are and why you might want to consider one if you have a split unit or central air. CAIRA: Liam, welcome to the show. LIAM: Hi, Caira. CAIRA: Hi. So you've written about heating and cooling for Wirecutter for years, and you also worked briefly at EnergySage, which is a company that helps connect heat pumps and solar panels with homeowners, right? LIAM: Yep, that's right. CAIRA: And you've also written a lot about heat pumps and home electrification. So can you tell me what exactly a heat pump is and how does it relate to air conditioning? LIAM: So a heat pump, they've actually been around for decades, but the tech improved a lot recently. They're all electric, so they don't use gas or oil, and it's super energy efficient for heating, so there's a lot of excitement from a clean energy perspective. If your house already has duct work in it, it's already there, you can... Instead of having a furnace and an air conditioner hooked up, you can just put a heat pump on there the same way that you would hook up an air conditioner. So there's a box outside your house. When we're talking about air conditioners, that's called condenser, but everyone just knows it is the big box outside the house. CAIRA: Oh, with the fan? LIAM: With the fan, yeah. CAIRA: Okay. LIAM: Yeah, yeah. And then there's an interior part, the coil, and that's attached to your duct work. And a fan blows across it. And if the coil's cold, you're going to get cold air through your ducts. That's air conditioning. If it's hot when the furnace is running or when the heat pump is in heating mode, it blows warm air through your ducts. That's where you get your heating. So with a ductless system, it's the same principle. You still have the outdoor box, but instead of one coil hooked up to the central duct work in your house, you have a bunch of mini coils all around your house in every room that you want to heat and cool. And it's all contained in that wall wart, as people call it, or the indoor unit as it's more technically referred to. And it's the same process happening, it's just in a slightly different format. CAIRA: That sounds very similar to the way that Thom just described how AC units work, except heat pumps can do heating and cooling, whereas ACs can only do cooling. LIAM: Right. So in cooling mode, a heat pump works exactly the same way as an air conditioner. There is actually no difference at all. People think of it like it's actually bringing cold air into your house. What it's really doing is absorbing the heat into the cold coil, and then sending it outside through that box that's outside. In heating mode, it works backwards. There's a coil outside the house too. That's soaking up the heat from the ambient air, and even when it's really cold outside, there's actually heat out there. The coil will soak up that heat, move it inside to the indoor coil, and then that will be hot or warm at least, and the fan will blow across the warm coil and move the heat throughout your house. CAIRA: I'm pretty personally invested in this, because I bought an old, rickety wooden cabin in upstate New York, and it's got no heating or cooling system that's centralized. It's got this gigantic propane heater, and no AC at all. So I looked into getting a heat pump for the house, and I was just floored by how expensive these can be, tens of thousands of dollars. So why switch to a heat pump if it's that expensive? LIAM: So any kind of HVAC upgrade, a central system like a furnace or an air conditioner, especially if your home doesn't already have it, is going to be five figures. It's a similar level of expense as what you got for the mini split quote. It's a huge comfort upgrade over window ACs. A mini split is usually the easiest way to get central or built-in AC to your house if your home doesn't already have it, and it's just a huge quality of life improvement. It's much quieter, your windows aren't blocked, you don't have to move anything. The cheap heat you get from them is almost like a bonus, and it looks better. Not everyone loves the wall mount style, some people call them wall warts. But they're ... CAIRA: They don't look that bad. LIAM: No. And some manufacturers make some that look a little better. LG has one that looks like a picture frame. And then there's different styles. You can have them floor mounted, you can put them in the ceiling. So there's a lot of different options. CAIRA: So it sounds like it might be an upfront cost, but it'll pay itself back in the long run. And also, it's just a luxury aesthetic upgrade. LIAM: Yeah, so there is some payback. And aside from the money, you have to think about paying yourself back in terms of comfort. They usually work better also than the window ACs do, though that's changed a little bit. And yeah, it's a lifestyle upgrade in a way, just not having to deal with the hassle of the window units. CAIRA: So what do you think one thing people considering getting a heat pump don't know that they really should? LIAM: I think the trickiest part is the installation. We know the technology works really well when it's installed correctly, but it's hard to find someone who actually knows how to do it well. I did some reporting on this depending on who I talked to. They thought it was anywhere from 30% to 50% of heat pumps are installed so badly that it really has an effect on the comfort and the cost that you can expect on your utility bills. CAIRA: Yikes. LIAM: Yeah, and probably more than that are subpar compared to what they could be. But 30% to 50%, you're probably going to notice a problem. It's just not living up to the potential they have for comfort and energy savings. And sometimes the technology takes the blame, but it's usually because the installer didn't set things up correctly. CAIRA: Luckily, you wrote a piece about how to find a good heat pump installer so people can refer to your guide if they really want to know all the details. LIAM: Yeah, I've been told it scares people as much as it helps them. But I think it's better to be informed rather than going in without any background. So yeah, the story's up on Wirecutter and hopefully people find it helpful. CAIRA: Can you tell me how people are paying for this, just assuming that you don't have five figures just sitting around in the bank? LIAM: Sure, yeah. Heat pumps are often incentivized through rebates or tax credits. There is currently, for now, a $2,000 federal tax credit. If you get a system installed that meets all the requirements for efficiency, it's a fraction of the overall cost but it's still useful. And then some states or local utility companies have their own rebate programs. You have to work with your installer, usually there's some paperwork to do. But they can be pretty big. In Massachusetts, we've had one that will give you $10,000 back off the cost of the installation. CAIRA: Wow. LIAM: Yeah. I also found that it probably raised the price of installation by $7,000 or so. CAIRA: No. LIAM: Yeah. Some of the money goes into your pocket, but a lot of it goes into the pockets of the installers, and that's another topic for another time, I guess. CAIRA: You got to spend money to make money. Or in this case, spend money so somebody else can make money. LIAM: That's one way to think about it, yeah. A lot of the areas that have incentives for heat pumps also have these really low interest or 0% loan programs. It's another way to try to encourage people to adopt this technology. CAIRA: All right, well thank you so much, Liam. LIAM: Thanks, Caira. CHRISTINE: All right, we are back with Thom Dunn to talk about some of the universal tips that anyone can use to keep their home cooler this summer. Thom, what are some of your basic strategies that anyone could use, whether they're using AC or not, to keep their home cooler this summer? THOM: If you want to keep your home comfortable, honestly, all year round, weatherization is so key. You can get weatherizing strips you can line around your windows for example, or under your door. And that can make a humongous difference by keeping the outdoors air and the indoors air separate. You can honestly, a lot of times tell, if you just put your hand near the window or near the door, and there's sometimes gaps around plumbing or if you have air conditioning, or any pipes leading out of your home. Any of those little kinds of tiny cracks, you can very, very easily fill in with weather strips or with caulk. That will make probably the biggest difference. Especially during the summer, you can also consider the way you're using shades, the way sunlight is getting into your room. When the sun gets into your house, it's going to get hotter, and sometimes that's awesome, especially in winter, but sometimes it's going to heat your house up and make it harder for you to work. So just close the blinds. And it feels sometimes silly to close the blinds when it's a beautiful sunny day outside. But when it's a beautiful sunny day outside and the sun is boiling you at 95 degrees, you want to keep that far away from you. CHRISTINE: And Thom, there are certain shades that are more effective at blocking out heat from outside. I think that we have a piece on the site that talks about cellular shades. THOM: Yes. I was grasping for the word there, but thank you. It was that cellular shades are a fantastic way to keep the heat on the outside. CAIRA: Well what's a cellular shade? CHRISTINE: They almost look like two shades that are glued together, and they're like a fan almost. CAIRA: Oh, yeah. Yeah, yeah, yeah. CHRISTINE: Yeah, yeah. And they create an air pocket that helps insulate. THOM: Yeah, cellular shade sounds way fancier. And you open the box, you're like, "Cool, it's some crinkly paper." CAIRA: It's important, I mean. THOM: But it does a great job. ROSIE: Weatherize, window AC units, portable AC units. What about ye olde time fan? THOM: Fans are where it's at. I generally prefer fans to air conditioning myself. So we have fans propped up all over our houses. Now we have a heat pump, so we do use the AC a lot more now. But the fans also help to keep the cold air then circulating around the house, which makes it even better. As I said earlier, if you do have a larger air conditioner in your home, you can use some extra fans to pull the air away from your living room or wherever and redirect it so that it moves into other parts of the house. CAIRA: Yesterday, my partner and I were debating if it's better on a boiling hot summer day to have a breeze that's blowing hot air or no breeze at all. So to that end, if you have no AC unit but you do have fans, are you hurting yourself or are you helping by circulating the hot air, even though there's no cool air coming in? THOM: You're still helping yourself. On a very basic biological level, our bodies sweat, and the purpose of sweat is to cool us down when the wind comes by. So even if it's a hot day and you only have hot air in the house, you're sweating. And a fan is still going to blow the moisture, the sweat off your skin, and that's going to make your body cool down. That is literally our most basic biological cooling practice. ROSIE: Well, and then you have ceiling fans. THOM: Ceiling fans. If you have a ceiling fan, just leave it on all summer. One of the neat tricks with ceiling fans is that they work just as well in the winter and the summer, but you have to make sure you change the direction of the fan. So warm air is lighter than cold air, and it rises up into the room. So during the winter, you want to run your ceiling fan clockwise, which will then help to push the warm air down to the room so that you're not losing all the heat you've been generating and paying for. Then during the summertime, you want to run the opposite direction. You want your fan to run counterclockwise, so that way it pulls the warm air up and out of the room and keeps pushing the cooled air back down so you're not overusing your air conditioner. Otherwise, your ceiling fan would basically be dumping your AC air over into the next room or out the window or whatever, and you don't want that. ROSIE: The more you know. CHRISTINE: There we go, there we go. ROSIE: I've lived all these years, I never knew. Thom, thank you so much for joining us. Our thanks to Liam McCabe. Thanks, Thom. CHRISTINE: Thanks, Thom. CAIRA: Thank you. THOM: Thank you. CHRISTINE: After we recorded our interview with Thom, our favorite window AC, the Midea U, was recalled. And most if not all Midea U buyers are eligible for either a prorated refund or a repair kit from Midea. They might also send out a technician in some cases to help you fix the unit. ROSIE: And this is one of those inverter compressor ACs we discussed earlier in the show. So for listeners who have this AC, and it's a very popular one, we wanted to give you a quick cheat sheet on what to do. So Christine, give us the who, what, where, when, why. CHRISTINE: This Midea U air conditioner, which is recommended by Wirecutter and a bunch of other sites, it was recently recalled over complaints about mold growing on the fan inside the unit. Listeners should keep in mind that mold can actually grow inside any air conditioner. It's not just the Midea Us, but this is an issue for this particular one. So it's important if you do have a Midea U you should be participating in this recall. ROSIE: Okay, so what should folks do to check if they're affected? CHRISTINE: To check your media for mold, you should look inside the grill. We're going to put a diagram in the show notes and see if there's any mold growing there. ROSIE: So, probably use a flashlight or something like that to check. CHRISTINE: Yes, absolutely. Use a flashlight, or a headlamp. ROSIE: And then if you find mold, or if you suspect there's mold there, what can you do? CHRISTINE: So, like I said, all Midea buyers are eligible for some kind of refund, but the amount varies depending on how long you've used the unit. You can get on Midea's site and check your model number to see if you're part of this recall. To get the refund, you'll need to fill out a form online, and then the company will either have you return the unit with a prepaid shipping label, which seems not many people are going to do that. These are huge units. They're very heavy. Or they will ask you to cut the cord and take a picture of it and send it to them. But if you'd rather keep the unit that you already have because it's huge and maybe you don't see a lot of mold in there, the company will mail you a DIY repair kit to help the AC unit drain better, which is essentially the issue. If your AC doesn't have a drain plug already, the company says it will send a technician out to drill one. ROSIE: And then what can folks do to reduce the chance of mold growing in their AC unit to begin with? CHRISTINE: Anyone with a window AC unit should really be running the fan, because that'll help everything dry out inside. And that's particularly true for these models, like the Midea U, which are these inverter compressor units. So run the fan. Keep things blowing, kind of like when you run the pan in your bathroom after a shower. ROSIE: There you go. Thanks for that, Christine. CHRISTINE: No problem. ROSIE: Today, we had a double hitter, Thom and Liam. CHRISTINE: We had the heating-cooling super duo. CAIRA: I really didn't think I was going to find it so interesting to learn how AC units worked. ROSIE: Who knew? CHRISTINE: Yeah. ROSIE: What are you guys actually taking away from this ep? CHRISTINE: Well, I was totally shocked and surprised when Thom explained why some of these larger window air conditioners that don't dehumidify as effectively. It really hit home for me why one of my rooms is not as cool as comfortable feeling as I would like it to be. But I think that I might consider getting a dehumidifier also if I can't get that room to be more comfortable. ROSIE: Yeah. The idea that if your AC isn't working as well as maybe you hope or want it to be, it could be a question of humidity. CHRISTINE: Of humidity, and not just cooling. ROSIE: Making you uncomfortable, yeah. CHRISTINE: Right, exactly. ROSIE: My take-away, honestly, is simple weatherizing. CHRISTINE: Yeah. We will also link in the show notes, we have some very specific recommendations for different weatherizing tools. CAIRA: I love that. My take-away is from my talk with Liam because... So I'm going to save up some coin, but then eventually in the future, I think I might actually go with a split AC unit because it's still an easier construction job than building ducts to get a whole heat pump system. CHRISTINE: Yeah. ROSIE: Look for those incentives. CAIRA: Yeah. ROSIE: Get a loan. CAIRA: Yeah. ROSIE: Low interest. CAIRA: With 0% interest. ROSIE: With 0% financing. CHRISTINE: That's right. ROSIE: Well, if you want to find out more about Wirecutter's coverage of ACs, splits, heat pumps, any of it, check out our website. As ever, you can find a link in the show notes. You can check out Thom and Liam's reporting. Stay cool out there. That's it for us this week. CAIRA: Thanks for listening. CHRISTINE: Bye. The Wirecutter Show is executive produced by Rosie Guerin, and produced by Abigail Keel. Engineering support from Maddy Masiello and Nick Pittman. Today's episode was mixed by Katherine Anderson. Original music by Dan Powell, Marion Lozano, Alicia Baetube and Diane Wong. Wirecutter's Deputy publisher is Cliff Levy. Ben Frumin is Wirecutter's editor in chief. I'm Christine Cyr Clisset. CAIRA: I'm Caira Blackwell. ROSIE: And I'm Rosie Guerin. CHRISTINE: Thanks for listening. BLOOPER ROSIE: Where in Boston do you live, remind me? LIAM: I'm out in Natick, I think you said you have some cousins out here? ROSIE: Natick, yah! I sure did.

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