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Dyson · Air purifiers

Dyson Purifier Hot+Cool Formaldehyde HP09

3-in-1 purifier, ceramic space heater, and cooling fan with solid-state catalytic formaldehyde sensor.

List price

$799

11 attributes tracked

Catalog as of September 1, 2026

Manufacturer list price, not a live offer. Confirm current pricing before you buy.

CADR

190 CFM class (Air Multiplier 77 gallons/sec circulation)

Coverage area

500 sq ft room size with 350° oscillation

What it does well

  • Combines HEPA H13 purification, fast ceramic heating, and cooling fan in one
  • Destroys formaldehyde continuously without filter replacement
  • Fully sealed whole-machine HEPA H13 standard prevents bypass

Where it gives ground

  • CADR airflow is lower than dedicated box purifiers
  • Expensive upfront purchase price

Compare it head to head

The fastest way to decide is against the product you are actually cross shopping. Showing 4 of 12 published matchups.

Air purifiers11 differing specs

Alen BreatheSmart 75i Large Room Air Purifier

$749

Dyson Purifier Hot+Cool Formaldehyde HP09

$799

Alen leads on 4 of 5 rankable specs and costs less.

See the breakdown
Air purifiers11 differing specs

Blueair Protect 7470i

$649

Dyson Purifier Hot+Cool Formaldehyde HP09

$799

Blueair leads on 4 of 5 rankable specs and costs less.

See the breakdown
Air purifiers11 differing specs

Coway Airmega 400

$549

Dyson Purifier Hot+Cool Formaldehyde HP09

$799

Coway leads on 4 of 5 rankable specs and costs less.

See the breakdown
Air purifiers11 differing specs

Dyson Purifier Hot+Cool Formaldehyde HP09

$799

Blueair Blue Pure 211+ Auto

$339

Blueair leads on 4 of 5 rankable specs and costs less.

See the breakdown

Full specifications

Performance

CADR
190 CFM class (Air Multiplier 77 gallons/sec circulation)
Room size
Medium to large bedrooms, living rooms up to 500 sq ft
Coverage area
500 sq ft room size with 350° oscillation

Filters

Filter types
360° Glass HEPA H13 + Activated Carbon + Cryptomic Formaldehyde filter
Filter life
12 months (HEPA/Carbon) / Permanent Formaldehyde catalyst

Usability & Smart

Noise levels
46 dB (Low) – 62 dB (Max)
Energy consumption
40 W (Purifier mode) / 1,575 W (Heating mode)
Smart features
MyDyson App, voice control via Alexa, Google Assistant, Siri Shortcuts
Air quality sensors
Solid-state formaldehyde sensor, PM2.5, PM10, VOC, NO2, Temperature, Humidity

Design & Ownership

Weight
12.6 lb (5.7 kg)
Warranty
2 years
Most rows are from the official spec sheet. Marked rows are other published figures or our summary, not lab tests we ran.Official Dyson Purifier Hot+Cool Formaldehyde HP09 spec sheet (opens in a new tab)

Other air purifiers we track

Alen

Alen BreatheSmart 75i Large Room Air Purifier

$749

CompareSpecs

Blueair

Blueair Protect 7470i

$649

CompareSpecs

Coway

Coway Airmega 400

$549

CompareSpecs

Coway

Coway Airmega 250

$399

CompareSpecs

Blueair

Blueair Blue Pure 211+ Auto

$339

CompareSpecs

Levoit

Levoit Core 600S Smart True HEPA

$299

CompareSpecs

Frequently asked

How much does Dyson Purifier Hot+Cool Formaldehyde HP09 cost?

Dyson Purifier Hot+Cool Formaldehyde HP09 lists at $799 (manufacturer list price snapshot as of 2026-09-01). Retail prices vary by merchant and this is not a live quote.

What are Dyson Purifier Hot+Cool Formaldehyde HP09’s key specs?

Key specifications for Dyson Purifier Hot+Cool Formaldehyde HP09 include cadr (190 CFM class (Air Multiplier 77 gallons/sec circulation)) and coverage area (500 sq ft room size with 350° oscillation).

What does Dyson Purifier Hot+Cool Formaldehyde HP09 compare against?

Dyson Purifier Hot+Cool Formaldehyde HP09 is compared head to head against Alen BreatheSmart 75i Large Room Air Purifier vs Dyson Purifier Hot+Cool Formaldehyde HP09, Blueair Protect 7470i vs Dyson Purifier Hot+Cool Formaldehyde HP09, Coway Airmega 400 vs Dyson Purifier Hot+Cool Formaldehyde HP09, Dyson Purifier Hot+Cool Formaldehyde HP09 vs Blueair Blue Pure 211+ Auto, Dyson Purifier Hot+Cool Formaldehyde HP09 vs Blueair Blue Pure 311i Max, and Dyson Purifier Hot+Cool Formaldehyde HP09 vs Coway Airmega 250.