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The best air purifier for your room size
An air purifier that is too small for the room barely makes a difference. The number to check is CADR (clean air delivery rate). Here is how to use it, and our picks for each room size.
How to size an air purifier
AHAM's rule of thumb is that a purifier suits a room of about 1.5 times its smoke CADR in square feet. A 250 CFM purifier suits about 375 sq ft. When a brand gives a much bigger number, it is usually for one air change per hour, which is too slow for allergies or smoke. Where no room size was published, our figures use the 1.5 rule and are labelled as estimates.
| Room | Size | Our pick |
|---|---|---|
| Bedroom, office | Up to about 250 sq ft | Levoit Core 300 or Winix A231 |
| Living room | About 350 to 400 sq ft | Levoit Vital 200S-P or Coway Airmega AP-1512HH |
| Large or open-plan | 600 sq ft and up | Blueair Blue Pure 211i Max |
Small rooms
Levoit Core 300
At about $90, the Core 300 is the cheapest purifier we list, rated for about 219 sq ft. Reviews are split: HouseFresh praises its CADR per dollar, while Tom's Guide found it less effective than other models. Sources also disagree on whether its filter is True HEPA, so check the label if that matters to you.
| Price | About $90 |
|---|---|
| CADR | About 140 CFM (dust). Levoit lists 143 CFM. |
| Room size | About 219 sq ft |
| Noise | 24 to 54.5 dB |
| Filter | Pre-filter, H13 True HEPA per Levoit, activated carbon |
| Wi-Fi | No |
Best for: Bedrooms and home offices under about 220 sq ft on a tight budget.
Sources: Levoit product page · HouseFresh review · Tom's Guide review
Winix A231
The Winix A231 has an AHAM-verified rating of 246 sq ft and a 147 CFM smoke CADR, at $129.99 on Nov 4, 2026. Its filter set is $54.99 every 12 months.
| Price | $129.99 (Nov 4, 2026) |
|---|---|
| CADR | 147 CFM smoke |
| Room size | 246 sq ft (AHAM Verified) |
| Noise | Not confirmed |
| Filter | Filter O set |
| Wi-Fi | Not confirmed |
Best for: Bedrooms and small rooms.
Sources: Dupple price check
Medium rooms and living rooms
Levoit Vital 200S-P
HouseFresh names the Vital 200S-P the best air purifier for most people. It has Wi-Fi, an air quality sensor and an estimated 254 CFM, for under $190. Note that this CADR is HouseFresh's PM1 estimate at turbo, not an AHAM rating.
| Price | Under $190 (exact price not stated) |
|---|---|
| CADR | 254 CFM (PM1, turbo mode only, HouseFresh estimate) |
| Room size | 381 sq ft (HouseFresh) |
| Noise | 42.5 dBA at speed 2 (lowest and highest not stated) |
| Filter | Bonded filter with a removable pre-filter and pelleted carbon |
| Wi-Fi | Yes, VeSync app |
Best for: HouseFresh's pick for most people.
Sources: HouseFresh air purifier tests
Coway Airmega AP-1512HH Mighty
The Coway Mighty is a long-time favourite with AHAM figures of 246 dust, 233 smoke and 240 pollen CFM, rated for 361 sq ft. TechGearLab measured an annual running cost of $110.16. It has no Wi-Fi.
| Price | $229.99 to $239.99 |
|---|---|
| CADR | 246 dust, 233 smoke, 240 pollen (CFM) |
| Room size | 361 sq ft |
| Noise | 24.4 to 53.8 dB |
| Filter | Washable pre-filter, deodorization (carbon) filter, True HEPA |
| Wi-Fi | No |
Best for: Buyers who want a proven, low-maintenance purifier and do not need Wi-Fi.
Sources: Coway product page · Walmart business listing (CADR, coverage) · TechGearLab review
Large and open-plan rooms
Blueair Blue Pure 211i Max
With 410 to 452 CFM depending on the source and a 674 sq ft recommendation, the 211i Max has the most cleaning power we list. It runs at 23 to 53 dB. Its HEPASilent filter is not a certified HEPA filter, though Blueair rates it at 99.97% down to 0.1 micron.
| Price | $349.99 list |
|---|---|
| CADR | 410 to 452 CFM, depending on source and particle type |
| Room size | 674 sq ft recommended |
| Noise | 23 to 53 dB |
| Filter | HEPASilent (mechanical plus electrostatic), activated carbon, washable pre-filter |
| Wi-Fi | Yes |
Best for: Large or open rooms where you want the most cleaning power and low noise.
Sources: Blueair US product page · SmartHomeCompared · Best Buy listing
Our verdict
For most bedrooms and living rooms, the Levoit Vital 200S-P is the pick. If you do not need Wi-Fi and want low running costs, get the Coway Airmega AP-1512HH. For big spaces, the Blueair 211i Max. Compare all 13 air purifiers →