Dyson

Dyson Purifier Hot+Cool Formaldehyde Air Purifier

The Dyson Purifier Hot+Cool Formaldehyde is a three-in-one fan, heater, and air purifier that adds dedicated formaldehyde sensing and destruction to Dyson's flagship purifier line.

### Overview

The Dyson Purifier Hot+Cool Formaldehyde offers a full suite of air treatment — heating, cooling, and air purification — making for a much more space-efficient appliance than investing in separate devices. Its standout distinction from other Dyson purifiers is a dedicated system to tackle formaldehyde: it can destroy the carcinogenic formaldehyde without the need for a replacement filter, as its catalytic filter is self-sustaining, trapping formaldehyde molecules into water and CO₂. It retails at $769.99 / £699.99 / AU$1,149 and is available directly from Dyson as well as third-party retailers like Amazon and Best Buy.

---

### Standout Features

- **Self-regenerating formaldehyde destruction:** Dyson's unique catalytic filter continuously traps and converts formaldehyde into water and CO₂ — and it self-regenerates, so it never needs replacing. - **Full HEPA H13 sealed system:** The filter meets the HEPA H13 standard, and the whole machine is fully sealed to the same standard, so no pollutants can bypass it. - **Triple-layer filtration:** A solid-state formaldehyde sensor and catalytic filter detect and continuously destroy formaldehyde, an activated carbon filter removes gases and odors, and a HEPA filter captures 99.97% of particles 0.3 microns in size. - **Real-time air quality sensing:** Integrated sensors constantly analyse air quality, while a unique algorithm cross-checks data every second to diagnose pollutants and display live results on the LCD screen. - **Whole-room air circulation:** It uses patented Air Multiplier™ technology to generate circulation power that can draw even distant pollutants into the machine, projecting purified air throughout the room. - **Intelligent heating + Diffused Mode:** It features an intelligent thermostat that turns the heat off when the desired temperature is reached, preventing wasted energy. A Diffused mode can also reverse airflow and blow out of the rear, so you can purify without directing airflow at yourself.

---

### Who It's For

It's essentially an all-in-one that is just as effective in the winter as it is in the summer with added air purification benefits, letting you ditch the separate machines throughout the year. It's particularly well-suited to those in homes with newer furniture, flooring, or recent renovations — sources of formaldehyde can include paint and varnishes, air fresheners, mattresses, furniture, household cleaners, carpets, particleboard and plywood, and electronics. It may also be of particular interest to those who can't open windows — such as those living in a block with sealed windows, or those with allergies who can't open the window during the day or night because of hay fever-triggering pollen.

---

### Important Considerations

- **Premium price with ongoing filter costs:** It is among the priciest in Dyson's purifier collection, and if you're just after a Dyson-branded heater, fan, or air purifier, there are slightly cheaper options tailored to each separately. Replacement HEPA + carbon filters cost $79.99 / £65 / AU$99, and Dyson recommends replacing them once every 12 months. - **"Cool" means airflow, not air conditioning:** This fan blows air around — it does not have any cooling properties aside from those that come from airflow itself. Most buyers are satisfied with the quality, design, and features, but beware if you're buying this as a cooling fan, as users don't appear to agree with Dyson's claims on this issue. - **Auto mode required for automatic response:** The device will not remotely monitor air quality and switch on when quality drops unless you run it on Auto Mode, which adjusts the fan power based on changing air quality. - **Compact but floor-standing:** Measuring 30 inches x 8.6 inches (H x D), it's fairly compact considering the number of features it houses, and at 12.6 lb / 5.5 kg it's light enough to be moved around your home fairly easily. It is not designed to sit on a desk or tabletop.

Seen at 5 retailers from $399.99 to $849.99 as of 2026-06-25. Prices change — check the retailer for the current price.

Few home purifiers tackle formaldehyde this seriously — but the privilege comes at a significant cost.