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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.

$799List price

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

Compare with another product →Explore the specs
CADR
190 CFM class (Air Multiplier 77 gallons/sec circulation)
Coverage area
500 sq ft room size with 350° oscillation

A closer look.

Reasons to choose it

  • 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

Worth considering

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

Put it next to your other option.

12 published comparisons feature this product.

Choose another product →
Air purifiers11 differences

Alen BreatheSmart 75i Large Room Air Purifier

$749

Dyson Purifier Hot+Cool Formaldehyde HP09

$799

Compare the differences
Air purifiers11 differences

Blueair Protect 7470i

$649

Dyson Purifier Hot+Cool Formaldehyde HP09

$799

Compare the differences
Air purifiers11 differences

Coway Airmega 400

$549

Dyson Purifier Hot+Cool Formaldehyde HP09

$799

Compare the differences
Air purifiers11 differences

Dyson Purifier Hot+Cool Formaldehyde HP09

$799

Blueair Blue Pure 211+ Auto

$339

Compare the differences

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)

Catalog snapshot: September 1, 2026. Published specifications, not independent lab tests.

View the official source ↗

Keep your options open

Also worth a look.

Coway

Coway Airmega 250

Modern slim aesthetic air purifier with Green True HEPA Max2 filtration, covering up to 930 sq ft, Smart Auto mode, and easy-clean washable pre-filter.

$399List price
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A few common questions.

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.