WinixAT40
Air purifier
DOE certified smoke CADR
265cfmDOE test
Dust 259 · PM2.5 261 cfm
Effective room size 410 sq ft (DOE)
DOE data as of 2026-11-03DOE record
Does it fit your room? How DOE sizes rooms
Winix AT40: certified to DOE with smoke CADR 265 cfm, dust 259, PM2.5 261, effective room size 410 sq ft. DOE data as of 2026-11-03.
Every model number on this record
Filed with DOE under basic model AT40. A listing with any of these numbers is this unit.
| Model number | Filed by |
|---|---|
| AT40 (DOE basic model) | Winix |
| AT41 | Winix |
How much does the Winix AT40 cost to run?
About $4.12 a month, or $49.40 a year, on DOE's annual energy figure of 272 kWh.
Electricity at 18.16¢/kWh, the US residential average for August 2026 (EIA Electric Power Monthly, table 5.6.A). Each 1¢/kWh you pay above or below 18.16¢ moves the yearly figure by $2.72.
How does the Winix AT40 rank in its DOE class?
In its DOE class (air purifiers, PM2.5 CADR 150+ cfm), 63 models have a matched Amazon listing. 25 of them have a higher CADR/W than its 5.6, which is 12% above their median of 5.
DOE's annual energy figure for it is 272 kWh, against their median of 266 kWh: $1.09 a year more at the US average price.
Air purifiers for 300 sq ft (44 with a listing)Among 140 air purifiers, PM2.5 CADR 150+ cfm
Smoke CADR (cfm)265
Higher than 82 of 140.
143591 cfm
Efficiency (CADR/W)5.6
Higher than 72 of 140. 5 others share 5.6.
313.5
Three to compare with
From models with a matched listing.
Within 20 cfm of its size, highest CADR/W
Blueair 3332111100283 smoke CADRRoom size 439 sq ft, CADR/W 8.4: about 33% less power for the same clean air.
Nearest size in its class with a higher CADR/W
MEDIFY AIR MA-50- 264 smoke CADRV3.0 Room size 409 sq ft, CADR/W 6.3: about 11% less power for the same clean air.
Nearest bigger unit
DREAME CVF14A286 smoke CADRRoom size 443 sq ft, CADR/W 5.4.
DOE record
Air cleaning
- Smoke CADR
- 265 cfm
- Dust CADR
- 259 cfm
- PM2.5 CADR
- 261 cfm
- Effective room size
- 410 sq ft
- Efficiency (IEF)
- 5.6 cfm/W
- Energy use
- 272 kWh/year
Record
- DOE basic model
- AT40
- DOE class
- 150 <= PM2.5 Clean Air Delivery Rate
- Brands on the filings
- 1
- In DOE's list since
- 2026-11-02first snapshot we hold
- ENERGY STAR record
- AT40certified 2026-05-29
Questions
- What room size is it for?
- DOE lists an effective room size of 410 sq ft, based on its smoke CADR of 265 cfm: CADR and room size.
- How much does the Winix AT40 cost to run for a year?
- About $49.40: DOE's annual figure of 272 kWh at 18.16¢/kWh, the US residential average for August 2026 (EIA).