DysonHP4B

Air purifier

DOE certified smoke CADR

34cfmDOE test

Dust 64 · PM2.5 49 cfm

Effective room size 53 sq ft (DOE)

DOE data as of 2026-11-03DOE record

Does it fit your room? How DOE sizes rooms

Dyson HP4B: certified to DOE with smoke CADR 34 cfm, dust 64, PM2.5 49, effective room size 53 sq ft. DOE data as of 2026-11-03.

Every model number on this record

Filed with DOE under basic model HP4B. A listing with any of these numbers is this unit.

Every model number filed under basic model HP4B, DOE data as of 2026-11-03
Model numberFiled by
HP4B (DOE basic model)Dyson

How much does the Dyson HP4B cost to run?

About $2.01 a month, or $24.15 a year, on DOE's annual energy figure of 133 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 $1.33.

How does the Dyson HP4B rank in its DOE class?

In its DOE class (air purifiers, PM2.5 CADR 10 to 99 cfm), 42 models have a matched Amazon listing. 35 of them have a higher CADR/W than its 2.3, which is 31% below their median of 3.35.

DOE's annual energy figure for it is 133 kWh, against their median of 94.5 kWh: $6.99 a year more at the US average price.

Air purifiers (133 with a listing)

Among 90 air purifiers, PM2.5 CADR 10 to 99 cfm

Smoke CADR (cfm)34

Higher than 17 of 90. 2 others share 34.

1993 cfm

Efficiency (CADR/W)2.3

Higher than 13 of 90. 5 others share 2.3.

1.914

Three to compare with

From models with a matched listing.

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

    DREAME CVA10B54 smoke CADR

    Room size 84 sq ft, CADR/W 10.3: about 78% less power for the same clean air.

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

    Purivortex AC300 Pro34 smoke CADR

    Room size 53 sq ft, CADR/W 3.6: about 36% less power for the same clean air.

  • Nearest bigger unit

    Cuckoo CAC-I0510FW59 smoke CADR

    Room size 92 sq ft, CADR/W 3.

DOE record

Air cleaning

Smoke CADR
34 cfm
Dust CADR
64 cfm
PM2.5 CADR
49 cfm
Effective room size
53 sq ft
Efficiency (IEF)
2.3 cfm/W
Energy use
133 kWh/year

Record

DOE basic model
HP4B
DOE class
10 <= PM2.5 Clean Air Delivery Rate < 100
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 53 sq ft, based on its smoke CADR of 34 cfm: CADR and room size.
How much does the Dyson HP4B cost to run for a year?
About $24.15: DOE's annual figure of 133 kWh at 18.16¢/kWh, the US residential average for August 2026 (EIA).