Air purifiers rated over 400 sq ft
Every AHAM-certified purifier whose tested coverage lands in this range, ranked on smoke CADR — with what each one costs to run continuously, which is how they are actually used.
Data current as of October 23, 2026 · 42 certified units · source AHRI + ENERGY STAR
What it costs to leave running
A purifier only works while it is on, so most people leave it on — and across the 41 units here with a certified wattage that costs anywhere from $49 to $340 a year in electricity at the same tariff, a 7× spread. Median $79. Over five years the gap between the ends is larger than most of these machines cost to buy, and no retailer prints it, because it takes AHAM's certified wattage joined to a power price.
Cheapest to run
Blueair 3332111100 (Blue Pure 311i Max)
$49 a year · smoke CADR 283 · rated to 439 sq ft
True HEPA
22 of 42
carry a true-HEPA filter. CADR already measures what actually reaches the room, so a high CADR without the HEPA label still cleans — the label is not the performance.
CADR and coverage are AHAM-certified; wattage is AHAM's smoke-mode figure. Annual cost assumes continuous running at $0.1883/kWh, the EIA US average — divide by your own hours if you run it less. Replacement filters are the other running cost and are not in this figure; AHAM does not certify filter price or life, so we do not estimate it.
The 20 highest-Smoke CADR of 42 certified units · 3 with a verified place to buy
| Brand & model | Smoke CADR | Coverage | Dust CADR | Watts | Per year | Buy |
|---|---|---|---|---|---|---|
| Lux LACH-2 Hera | 450 | 698 sq ft | 400 | 120 W | $198/yr | no listing |
| Lux LACS-1 Aura | 450 | 698 sq ft | 400 | 120 W | $198/yr | no listing |
| Blueair 7711371000 (7710i US) | 435 | 674 sq ft | 400 | 75 W | $124/yr | no listing |
| Blueair 3613111100 (Pure Blue 211i Max) | 435 | 674 sq ft | 453 | 44 W | $73/yr | no listing |
| Lichen Air Lichen Air | 434 | 673 sq ft | 425 | 88 W | $145/yr | no listing |
| LEVOIT LAP-C601S-AUS (Core 600S-P) | 391 | 606 sq ft | 398 | 66 W | $108/yr | no listing |
| LEVOIT LAP-C601S-WCA (Core 600S-P) | 391 | 606 sq ft | 398 | 66 W | $108/yr | no listing |
| LEVOIT LAP-C601S-WUS (Core 600S-P) | 391 | 606 sq ft | 398 | 66 W | $108/yr | Buy |
| WOZOYO Pure Air PA12 | 363 | 563 sq ft | 372 | 64 W | $105/yr | no listing |
| WOZOYO Pure Air PA6 | 363 | 563 sq ft | 372 | 64 W | $105/yr | Buy |
| Blueair 3631101000 (Blue Pure211+ Auto) | 356 | 552 sq ft | 347 | 36 W | $59/yr | no listing |
| Whirlpool WPPRO2000 | 341 | 529 sq ft | 339 | 113 W | $186/yr | Buy |
| Blueair 3432111100 (Blue Pure 311i+ Max) | 339 | 525 sq ft | 370 | 37 W | $60/yr | no listing |
| Whirlpool WP500 | 328 | 509 sq ft | 318 | 103 W | $170/yr | no listing |
| Field Controls TRIO Plus S | 327 | 507 sq ft | 342 | 88 W | $145/yr | no listing |
| Fellowes AeraMax SE | 323 | 500 sq ft | 329 | 67 W | $111/yr | no listing |
| Insigna NS-APLWH2 | 321 | 497 sq ft | 310 | 69 W | $114/yr | no listing |
| Aerus 4431311001(Blue signature SP3i)(ROW) | 321 | 498 sq ft | 309 | 30 W | $50/yr | no listing |
| Blueair 4442411000(Blue signature SP3i)(ROW) | 321 | 498 sq ft | 309 | 30 W | $50/yr | no listing |
| Blueair 4412311000(Blue signature SP3i) | 321 | 498 sq ft | 309 | 30 W | $50/yr | no listing |
Showing the top 20 by Smoke CADR. All 42 certified units in this group are filterable in the full product list — we rank here rather than dump, because a table nobody can read is not a resource.
Capacity and efficiency are AHRI-certified values; $/MMBtu is computed by us from EIA energy prices — see methodology. Heat at 5°F is the number that decides whether a heat pump keeps up in real cold, and most listings omit it.