WinixC535

Air purifier · DOE basic model 5300-2

DOE certified smoke CADR

239cfmDOE test

Dust 244 · PM2.5 241 cfm

Effective room size 370 sq ft (DOE)

DOE data as of 2026-11-03DOE record

Does it fit your room? How DOE sizes rooms

Winix C535: certified to DOE with smoke CADR 239 cfm, dust 244, PM2.5 241, effective room size 370 sq ft. DOE data as of 2026-11-03.

Every model number on this record

Filed with DOE under basic model 5300-2. A listing with any of these numbers is this unit.

Every model number filed under basic model 5300-2, DOE data as of 2026-11-03
Model numberFiled by
5300-2 (DOE basic model)–
C535Winix

How much does the Winix C535 cost to run?

About $5.39 a month, or $64.65 a year, on DOE's annual energy figure of 356 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 $3.56.

How does the Winix C535 rank in its DOE class?

In its DOE class (air purifiers, PM2.5 CADR 150+ cfm), 63 models have a matched Amazon listing. Its CADR/W of 4.1 is tied for 46th of the 63, and 18% below their median of 5.

DOE's annual energy figure for it is 356 kWh, against their median of 266 kWh: $16.34 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)239

Higher than 68 of 140.

143591 cfm

Efficiency (CADR/W)4.1

Higher than 27 of 140. 3 others share 4.1.

313.5

Three to compare with

From models with a matched listing.

  • Within 20 cfm of its size, highest CADR/W

    DREAME CVF20B224 smoke CADR

    Room size 347 sq ft, CADR/W 8.8: about 53% less power for the same clean air.

  • Nearest size in its class with a higher CADR/W

    Coway AP-1512N242 smoke CADR

    Room size 375 sq ft, CADR/W 4.5: about 9% less power for the same clean air.

  • Nearest bigger unit

    MEDIFY AIR MA-50-V3.0264 smoke CADR

    Room size 409 sq ft, CADR/W 6.3.

DOE record

Air cleaning

Smoke CADR
239 cfm
Dust CADR
244 cfm
PM2.5 CADR
241 cfm
Effective room size
370 sq ft
Efficiency (IEF)
4.1 cfm/W
Energy use
356 kWh/year

Record

DOE basic model
5300-2
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

Questions

What room size is it for?
DOE lists an effective room size of 370 sq ft, based on its smoke CADR of 239 cfm: CADR and room size.
How much does the Winix C535 cost to run for a year?
About $64.65: DOE's annual figure of 356 kWh at 18.16¢/kWh, the US residential average for August 2026 (EIA).