How To Choose An Air Purifier
Whether it's wildfire smoke sneaking into your windows, pet dander floating through the air, or just that persistent smell of yesterday's dinner, a good air purifier can seriously upgrade your indoor air quality. But with so many models, acronyms, and marketing claims floating around, choosing the right one can feel like trying to find fresh produce in January.
Here's a practical, no-nonsense guide to help you make the right choice for your space, your needs, and your budget.
What Exactly Is an Air Purifier?
An air purifier pulls in your indoor air, filters out contaminants like dust, pollen, smoke, and odours, and then pushes cleaner air back into your space. Most purifiers rely on filters (ideally True HEPA) and many include activated carbon to absorb VOCs and smells.
Bonus: Some models even tackle bacteria and viruses, though you'll want to read the fine print (and the science) before betting your health on UV lights or ionizers.
Questions to Ask Before You Buy
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How Big Is the Room?
Air purifiers are sized based on square footage (sq ft or m²). Buying one that's too small for your space is like trying to heat your garage with a toaster.
Bedrooms or offices? 100–200 sq ft (9–18 m²) typically only require a compact unit.
Open concept living rooms? Look for models rated for 400+ sq ft (37+ m²).
Check the CADR (Clean Air Delivery Rate) — higher means faster filtration.
What Do You Want to Remove?
Allergies? Look for a True HEPA filter — not 'HEPA-type' or 'HEPA-like'. The real deal captures 99.97% of particles down to 0.3 microns.
Smells or VOCs? Make sure your purifier includes activated carbon.
Smoke? Check CADR ratings specifically for smoke.
Mould? Consider a unit with a pre-filter and good humidity control.
Is It for a Bedroom?
Look at the noise rating (in decibels). Below 30 dB is whisper-quiet. Over 50 dB? That's white noise territory, which may or may not help you sleep.
How Much Energy Will It Use?
Since purifiers often run 24/7, energy efficiency matters. Look for Energy Star® certified models (recognized by Natural Resources Canada). Your energy bill will thank you.
Types of Air Purifiers
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True HEPA Filters
Captures fine particles like dust, pollen, pet hair, mould spores, and wildfire smoke. Always check for 'True HEPA' — it's a regulated standard.
Activated Carbon Filters
Essential for removing odours, smoke, and VOCs (volatile organic compounds). Especially helpful if you cook often or live with smokers.
UV-C Light
Claims to neutralize bacteria and viruses using ultraviolet light. Mixed evidence on real-world effectiveness, and bulbs need regular replacement. Use with a healthy dose of skepticism.
Ionizers and Ozone Generators
Some models 'ionize' the air, charging particles so they clump and fall. The catch? Some ionizers release ozone, which can be irritating or even dangerous at high levels. Look for CARB-certified models if you're considering this route.
Features Worth Your Attention
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Air Quality Sensors & Auto Mode: Detect pollution in real-time and adjust fan speed automatically. Efficient and lazy-friendly.
Filter Replacement Indicator: Trust us, you won't remember on your own.
Smart Features: App control, Alexa/Google compatibility, scheduling — helpful if you like tech, or forget to turn things off.
Sleep Mode: Dims the lights and lowers fan speed for night-time use.
Filter Cost & Availability: Some filters cost as much as the machine. Check before you buy — especially if it's a lesser-known brand.
Important Numbers to Know
CADR Rating: Speed of air cleaning (higher = faster)
Coverage Area: Room size in sq ft / m²
Noise Level: Measured in dB; <30 dB = quiet
Filter Life: Typically 6–12 months; check the cost to replace
Energy Use: Energy Star = lower Hydro bills
Final Tips
One purifier ≠ whole house. You'll need one per major room (or a fancy HVAC-integrated system).
Don't forget to factor in filter replacement every 6 to 12 months — and shipping if it's not stocked at Canadian retailers.
Our Top Picks for an Air Purifier
Our Guide To The Best Air Purifiers In Canada In 2025 (And Where To Get Them)
Our Guide To The Best Portable Air Conditioners In Canada In 2025 (And Where To Get Them)
Our Guide To The Best Vacuum/Mop Combos In Canada In 2025 (And Where To Get Them)
Disclaimer: The prices displayed are accurate at the time of publication. We'll do our best to keep them as up-to-date as possible, but you may see slight changes. The products in this list are ranked by independent third parties. Rankings are based on both reviews and independent testing.
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