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Dyson purifier hot cool formaldehyde
Dyson purifier hot + cool formaldehyde™

Dyson Purifier Hot+Cool™ Formaldehyde

Captures dust, allergens and bacteria. Even destroys formaldehyde.

Removes 99.95% of ultrafine particles

Purifies and heats the whole room

Fully-sealed to HEPA standard – what goes inside, stays inside

Buy direct from the people who made it

Pioneering Dyson technology

Explore the engineering behind the Dyson Purifier Hot + Cool Formaldehyde

Pioneering Dyson technology

Explore the engineering behind the Dyson Purifier Hot + Cool Formaldehyde

Air valve motor

The valve mechanism is driven by a brushless stepper motor, to allow remote actuation and switching between Diffused mode and Fan mode.

Air Multiplier technology

Projects a long-range stream of smooth air. No need for blades.

PTC plates

Air circulates between the plates and external casing, to heat the air as it leaves the machine.

Formaldehyde sensor

Solid state electrochemical cells precisely detect formaldehyde for the lifetime of the machine.

Gas and particulate sensors

Measures and detects particles and volatile organic compounds in the air.

360 HEPA H13 filter

9 metres of borosilicate microfibres, pleated over 200 times, captures 99.95% of pollutants as small as 0.1 microns.1

Selective catalytic oxidisation filter

Traps formaldehyde in catalytic tunnels, continuously breaking it down into water and CO2.

Activated carbon filter

A layer of carbon captures gases1 such as benzene and NO2.

Dyson purifier hot+cool formaldehyde purifying a large living space

Powerful circulation to purify the whole room³

Only Dyson purifiers have Air Multiplier™ technology, to draw in distant pollutants and project purified air throughout the room.

  • Graphic comparison of CADR test v Dyson test
  • Graphic comparison of CADR test v Dyson test

Pollutant sources in a living space and kitchen

Poor air quality isn't just a problem outside.
It's a problem inside too.

From pets and flowers, to sprays and stoves, our homes can trap pollutants in the air. That's why Dyson purifiers automatically sense and remove them.

Internal sensing technology and LCD screen showing formaldehyde detected

Senses and reports, automatically

Four sensors, including a solid-state formaldehyde sensor, interact with our unique algorithm to precisely diagnose, display and react to your air quality.

Graphic of Dyson filtration system

Captures and destroys with an advanced HEPA filtration system

The HEPA+Carbon filter captures gases⁵ and 99.95% of particles as small as 0.1 microns.² Our catalytic filter continuously destroys formaldehyde¹.

Close up graphic of catalytic tunnel

Destroys formaldehyde in billions of catalytic tunnels¹

Dyson's unique catalytic filter continuously traps and converts formaldehyde into water and CO₂. And it self-regenerates, so it never needs replacing.

Graphic showing fully sealed purifier

The purifier is fully sealed to HEPA H13

To prevent pollutants leaking back into the air, it's not just the filter that's sealed to HEPA H13 standard, it's the whole purifier.⁴ So what goes inside, stays inside.

Dyson purifier hot + cool formaldehyde heating the whole room

Fast, even room heating

Air Multiplier™ technology projects purified, heated air throughout the room.⁴ Once your target temperature is reached, heating automatically stops.

Man controlling his purifier with the MyDyson app

Smart purification, controlled by app or voice

Control and monitor air quality from anywhere with the MyDyson™ app,⁶ or hands-free with compatible voice services.⁷

  • Image showing powerful, cooling airflow
  • Purified air exiting the back of the purifier
  • Dyson purifier in a dark bedroom with someone sleeping peacefully
  • Someone changing their filter

Dyson Purifier Hot+Cool™ HP09 Formaldehyde (White / Gold)

Overall rating

71% of reviewers would recommend to a friend.

Amazing changed our nights for the best


My 4 year old son has asthma and he is at his worst when trying to sleep, before we purchased our air purifier he would rarely get a full night sleep. He would wake up several times throughout the night coughing which would leave him very upset. Since we got our air purifier he no longer wakes at night unless he has a nightmare lol. Thanks very much Dyson product has been a life changer for us.

Frequently asked questions

What is new about the Dyson Purifier range and how is it different to other purifiers?

Dyson engineers are perfectionists. Channelling our relentless dissatisfaction, we have re-engineered the Dyson Purifier range to be our first purifiers fully sealed to HEPA H13 standard. Capturing 99.95% of ultrafine particles and preventing pollutants from leaking back into the air you breathe.

What is different about the Dyson Purifier Formaldehyde range?

The Dyson Purifier Cool Formaldehyde has all of the capabilities found in our advanced purification products but goes a step further to detect and destroy formaldehyde. An added solid state-sensor precisely detects formaldehyde, while our catalytic filter breaks it down into two safer molecules – carbon dioxide and water.

What is formaldehyde and what are common sources of it?

Formaldehyde is a polluting gas formed of carbon, hydrogen and oxygen that is commonly found in homes. Common sources of formaldehyde in your home could be: paint and varnishes, air fresheners, mattresses, furniture, household cleaners, carpets, particleboard and plywood, electronics, dryer sheets, nail polish remover, moth balls, toys, fireplaces and wood burning stoves.

How often should I replace my filter?

We recommend replacing the HEPA+Carbon filter every 12 months. That's because over time, filters can get clogged with pollutants, and even let unpleasant odours back into the room. The machine will alert you when it’s time to change filters. A filter life reading can be found on the LCD screen and via the MyDyson™ app. The catalytic filter never needs replacing.

  • 1 Third party full machine testing based on GB/T 18801-2018 formaldehyde cumulative clean mass testing with continuous injection until plateau of formaldehyde CADR is achieved. Results may vary in practice.
  • 2 Tested for filtration efficiency at 0.1 microns (EN1822, ISO29463)
  • 3 In maximum setting. Tested for air projection, purification coverage in an 81m³ room and heating performance in a 35m³ room.
  • 4 Particle challenge by DEHS oil specified in EN1822 within a chamber specified in ASTM F3150. Tested in Max Mode at IBR US, for whole machine efficiency above 99.95%.
  • 5 Gas capture rates may vary.
  • 6 Requires device to run app, Wi-Fi or mobile data, Bluetooth 4.0 support, and iOS version 14.0 or Android version 8.0 (or above). Standard data and messaging rates may apply. App control doesn’t apply to heating.
  • 7 Refer to the MyDyson™ app for compatible voice services.
Dyson filter

Filter replacements

Find the right filter for your purifier.