Dyson Purifier Hot+Cool Formaldehyde Hands-on Review


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Erin Lawrence

dyson, hot cool formaldehyde, fan, heater, purifier, reviewI’ve written extensively about Dyson’s lineup of heaters, fans, purifiers and humidifiers. It’s a pretty big lineup… and it’s grown again. Dyson launched its new Dyson Purifier Hot+Cool Formaldehyde not only heats and cools, but it also detects and destroys formaldehyde and senses and traps other pollutants in the air too. The fan uses Dyson’s bladeless technology to move air around your room and can be adjusted to suit your comfort and noise levels.

Dyson Purifier Hot+Cool Formaldehyde Hands-on Review

In this review, I’ll take a look at the fan’s heating, cooling and purifying properties, how well it works, plus its special features.

What is Formaldehyde? And why do I need to remove it from my home?

Formaldehyde is a chemical that is used in building materials and household products. It can also be found in materials made of pressed wood, such as particleboard and plywood, as well as glues and adhesives. Formaldehyde is also used as a disinfectant and germicide and can be found in wallpapers, some fabrics, fireplaces and vehicle exhaust. Laboratories and mortuaries often use formaldehyde for its preservative qualities. Formaldehyde gets into our homes mainly through what’s called off-gassing, where construction or renovation materials, furniture, cabinets and household products slowly release formaldehyde over time.

dyson, hot cool formaldehyde, fan, heater, purifier, review

Dyson’s special formaldehyde filter.

So what’s the problem? The Government of Canada calls formaldehyde an irritant, saying exposure to high concentrations can cause burning sensations in the eyes, nose and throat. Formaldehyde is also classified as “carcinogenic to humans” by the International Agency for Research on Cancer (IARC).
Long-term exposure to moderate concentrations may worsen asthma symptoms and may also be linked to other respiratory symptoms and allergic sensitivity.
Formaldehyde is classified as “carcinogenic to humans” by the International Agency for Research on Cancer (IARC).

So… we’d probably rather not have formaldehyde accumulating in our homes. That’s where this special Dyson Purifier Hot+Cool Formaldehyde comes in.

Formaldehyde Filter and Air Quality

dyson, hot cool formaldehyde, fan, heater, purifier, reviewThe Dyson Purifier Hot+Cool Formaldehyde uses a catalytic filter to detect then break down formaldehyde into water and carbon dioxide and Dyson claims it will never need to be replaced. The solid-state sensor is said to detect formaldehyde molecules 500 times smaller than 0.1 microns. You can actually see in detail the formaldehyde levels in your house; it’s listed as “HCHO” so you can keep tabs on it.

You can set the fan to kick into action automatically when particulate matter increases in the air and drop back down when the air is clearer.

Dyson Purifier Hot+Cool Formaldehyde also has a HEPA H13 standard filter, which can be removed and replaced. Dyson says the entire fan also is sealed to HEPA H13.

dyson, hot cool formaldehyde, fan, heater, purifier, reviewAesthetics

The Dyson Purifier Hot+Cool Formaldehyde has a beautiful, sleek look that Dyson has become known for. The gold-coloured plating on the filter cover provides a nice contrast to the silver body, and the white fan housing is white with a black accent. The remote is also gold-coloured, and curved to match the contours of the fan; a small magnet inside the remote lets it stick to the top of the fan so you can store it somewhere you can always find it.

The unit is big; there’s no getting around that; it’s a bit big in my opinion to be placed on a table or surface; it’s kind of overpowering. The device stands about 30 inches in height, and is roughly 8 inches in diameter.

Info screen

The Hot+Cold Formaldehyde has a tiny digital screen to show you different information; you can set it to display the individual particulate levels in the room, the temperature, or humidity. The current speed is always displayed at the top of the screen.

Air Control: What you can do with Dyson

The fan provides ten levels of output in both heating and cooling mode.

Auto mode will speed up and slow down the fan as needed to clean the air, or to maintain a specific heat level if you’re using it for heating.

dyson, hot cool formaldehyde, fan, heater, purifier, reviewDepending whether you like air blasting directly at you, or you’re just trying to get some flow through, you can adjust the airflow of the Dyson purifier hot plus cool formaldehyde. With the diffuse mode, it circles the air around the blade less top to keep things moving, or you can adjust it for a more directional and powerful flow that will wash over you.

The airflow is naturally adjustable from 1-10 and I found level 5 got good flow going without being too loud. Speaking of loudness.. how loud is the fan? On it’s highest levels I’d say it’s about average-to-quieter.

How cool/hot does it feel?

I always get asked if a Dyson fan is like air conditioning… I think folks think if it’s this expensive it must also be able to cool the air, right? Not so. This fan straight up blows air around, it does not have any cooling properties, aside from those that come from airflow itself.

How hot does it get?

When it comes to heat, the Dyson Hot+ Cool really shines. You can choose a heat setting almost like using a thermostat, and the Dyson will maintain it for you by cycling the heater on and off. I like using this setting at night so it doesn’t get too hot in the room. The temperature on the Dyson will heat up to ??? degrees

dyson, hot cool formaldehyde, fan, heater, purifier, reviewControls and Settings: Remote Control or use the app

The remote allows you to change the fan speed at ten different increments, turn the heat function on or off, and turn the fan itself on. It also allows you to set the night mode and turn on the timer function.

Identical controls exist in the Dyson Link app, so you can always have a remote handy. The app is super easy to use and navigate. In the app is where you can really get a detailed look at your pollutant levels too; you can see historical data, as well as current levels, and you can view overall air quality, or drill down and see which specific pollutants are being detected.

dyson, hot cool formaldehyde, fan, heater, purifier, reviewOther modes & settings

Night Mode
The Dyson Purifier Hot+Cool Formaldehyde also features a night mode, which lowers the screen’s brightness, and puts the fan into a quieter operating mode.


You can also set a timer that will automatically turn the fan/heater off after 15 minutes up to 9 hours.


Want the fan to swing side to side? Not only can you set that inside the app, but you can control the size of the arc, from 45 degrees all the way up to a nearly full circle 350 degrees.

Smart Voice Control

dyson, hot cool formaldehyde, fan, heater, purifier, reviewYou can use Google Assistant, Amazon Alexa or Apple’s Siri to gain voice control and hands-free automation. You’ll be able to access specific functions of the fan and use those as steps in more advanced routines. Siri and Alexa are accessed through the Dyson app while setting up your Dyson device for Google requires you to go into the Google Home app and set up a new products by searching for Dyson.

Overall review: Dyson Purifier Hot+Cool Formaldehyde

Overall, this is a pretty great and versatile device. I’ve had great experiences with Dyson products; they work very well, require almost no maintenance and they look good in my space.

The price tag on this device may seem steep, but consider that you’re getting a powerful fan for summer, a heater for winter, and a powerful air purifier that also cleans formaldehyde from your air for year-round comfort and clean air. Downsides? Aside from the price some folks will point out… I suppose it is rather large and you will really need a dedicated spot for it.

In short, the Dyson Purifier Hot+Cool Formaldehyde delivers solid heating, cooling, and air purifying in an attractive package. I can recommend it for your home too.

It sells for about $899CAD from many major electronics retailers and from Amazon.

**A note about Affiliate Links: TechGadgetsCanada & TechGadgetsInternational is supported by our readers. Occasionally I will include affiliate links in my reviews. I do this partly for convenience of the reader (since I’ll almost always include a link to the company website or similar anyway) in case you want to read more or purchase, but I also may get a small commission from the click, which helps me keep the blog running. If you choose to use this link I thank you greatly for supporting the blog. There’s no obligation or cost to you for using these links. As an Amazon Associate I earn from qualifying purchases.

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