Air Purifiers

A purifier is only as good as the air it moves through its filter. The figure to compare is CADR, the clean air delivery rate; the Association of Home Appliance Manufacturers suggests a smoke CADR of at least two-thirds of the room's floor area in square feet.

After that, look at what it costs to keep running — the price and life of the replacement filters — and at how loud it is on the setting you will actually use at night.

Each comparison below lays those numbers side by side for one family and names the model to buy for each room.

All 13 comparisons

• Blueair Blue Signature Large Nordic Fog drops to $359.992026-09-27
• Winix 5000 and C Series: Which True-HEPA Purifier Fits Your Smoke-Odour Budget?

  Best overall: 4-stage filtration, 360 sq ft coverage and 27 dB operation at $129.99, $70 below the 5510 and 5520.

  2026-09-24
• Winix T and A Series Air Purifiers for Larger Rooms: Which Tower to Buy

  Best overall: Covers 410 sq ft with five fan speeds and runs at 22 dB, the quietest listed, for $199.99.

  2026-09-24
• Coway Airmega Mighty Series: Which Mid-Size Purifier to Buy

  Best overall: 233 CADR and 1748 sq ft coverage with a 6-month/1-year filter schedule, at $239.99.

  2026-09-23
• Levoit Core Air Purifiers: Which One to Buy for Bedroom or Living Room

  Best overall: 143 CFM and 1,066 sq ft of coverage at $84.97, only $14.98 more than the Core 200S-P.

  2026-09-23
• Best Levoit Air Purifier for Pet Hair and Dust in Larger Rooms

  Best overall: 250 CFM CADR and 1,862 sq ft coverage suit larger rooms, and its $189.99 price sits $70 above the Vital 100S-P and $70 below the Eleva 500X.

  2026-09-23
• Coway Airmega 300 vs 350 vs 400 vs 400S: Which Purifier for an Open-Plan Floor or Whole Apartment

  Best overall: Covers 3120 sq ft at 328 CADR for $649, the largest coverage in the family.

  2026-09-22
• Alen BreatheSmart Air Purifiers: Which Size Fits Your Room?

  Best overall: A mid-tier $449 unit rated 4.8, it sits $160 above the smallest model and $350 below the largest, making it the balanced choice for a large room.

  2026-09-22
• Coway Airmega 100 vs 150 vs 200M vs 250: Which Tower Purifier Fits Your Room?

  Best overall: 246 CADR and 1,748 sq ft coverage at $229.99, only $40 more than the 150 and $100 more than the 100.

  2026-09-21
• Blueair Blue Pure Max: Which Size Clears Your Large Room Fast and Quietly?

  Best overall: Highest airflow in the family at 435 CFM and 674 sq ft coverage, yet runs at 23 dB on low and is at its $349.99 90-day low.

  2026-09-21
• Blueair Signature vs Classic: Which Air Purifier Fits Your Large Room?

  Best overall: Covers 705 sq ft at 455 CFM and runs at 23 dB, the largest coverage in the Signature line.

  2026-09-21
• Windmill Air Conditioners and Purifiers: Which One Fits Your Room

  Best overall: Covers 250 sq ft at $289, the only window air conditioner here, and rated 4.8.

  2026-09-21
• Best Budget Dreo Air Purifier With App Control for a Bedroom or Office

  Best overall: At $99.99 it is the least expensive model here while covering 856 sq ft with a 3-in-1 HEPA filter and six fan speeds.

  2026-09-20