The Dyson HP12 Purifier Hot+Cool HP2 De-NOx is a purifying fan heater for year-round use: it cleans the air, heats the whole room in winter and cools you in summer. It suits homes with gas hobs, open fires or wood burners, because its K-carbon filter is designed to catch more of the nitrogen dioxide those appliances give off.

What it does

A fully sealed, three-stage filter system captures 99.95% of pollutants as small as 0.1 microns. The HEPA H13 layer traps dust, allergens and bacteria. The K-carbon layer, treated with potassium carbonate, removes odours and gases including VOCs and absorbs 50% more nitrogen dioxide than regular activated carbon, and a catalytic filter continuously destroys formaldehyde. Air Multiplier technology moves over 290 litres of air per second, with 350° oscillation to spread warmth or a cooling breeze around the room.

Everyday use

Auto mode lets the integrated sensors analyse the air and adjust the machine, so it only uses energy when needed, and the thermostat holds the temperature you choose. The remote gives you 10 airflow settings. The LCD screen and the MyDyson app show live air quality, and the app adds schedules and voice control. The catalytic filter never needs replacing; Dyson recommends a fresh HEPA+K-Carbon filter every 12 months, and the screen tells you when. In quiet mode it runs at 38 dBA. Automatic cut-outs work if it tips over or overheats, and there are no visible heating elements.

Size and installation

It stands 76.4 cm high on a base 24.8 cm wide and 24.8 cm deep, and weighs 5.5 kg. It has a 1.8 m cord and comes with the HEPA+K-Carbon filter and a curved, magnetic remote control. As a heater, Dyson says it is only suitable for well-insulated spaces or occasional use.