Increasing airflow will create a cooling effect using purified air, so you may find it beneficial to change your purifying fan heater's speed settings as the temperature changes. For personal cooling in summer, use settings 4-10. In colder periods, enable diffused mode. It projects air through the back of the machine, to avoid unwanted cooling.

If you're concerned by the brightness of your purifying fan heater's LCD display, consider enabling Night-time mode using your remote control or the Dyson Link app. During operation, a small moon icon indicates that your purifier is on, but the main display turns off after 10 seconds to help avoid sleep disturbance.

If auto mode is enabled, AUTO will be illuminated on your purifying fan's LCD display. When your machine is purifying the air, AUTO will be in white. When the air in the room is purified, it will turn green and your purifying fan heater will remain idle until pollutant levels rise.

Your purifying fan's auto mode is designed to manage the air quality in your home without you having to operate the machine – so it's only on when it needs to be. If you or someone in your home suffer from allergies or respiratory illnesses, we particularly recommend using your machine's auto mode.

Your purifying fan heater is engineered to purify single rooms, so you should use it where you spend the majority of your time at home. When placing the machine, make sure there is at least a few feet of clearance on all sides so that the air can circulate effectively.

Your purifying fan heater works most efficiently in a sealed environment – opening the windows can allow more pollutants to enter the air in your home, which means your machine will take longer to work.

The Dyson Pure Hot+Cool™ HP4A purifying fan heater works independently and doesn't currently connect to the MyDyson^™️ app. It does not feature app connectivity.

The machine will alert you when it’s time to change filters, depending on use we recommend replacing the HEPA + Carbon filter roughly every 12 months, depending on how often you use it. That’s because over time filters can become clogged with pollutants and even let unpleasant odors back into the room.

Both filters ensure a 360 degree sealed filtration system, HEPA standard and proper functioning of the machine. The black/white, 360 Combi Glass HEPA + Carbon air purifier filter is a newer model. It now combines both HEPA and carbon filter as one piece, for even more convenient installation and maintenance.

If this is your first time changing your filter, fully remove the purple and green filter from your machine before replacing it with the new, all-black 360° Combi Glass HEPA + Carbon Air Purifier Filter. Dyson has updated the filter for this machine to a 2-in-1 replacement filter that combines both HEPA and carbon filter as one piece, for even more convenient installation and maintenance.

We simplified the filter by engineering a two-part filter to replace the four-part filter.

It's important to reset your filter life after you have replaced your filter. To reset your filter life, press and hold the Night mode button on your remote control. The display on your machine will countdown from five, the filter life will be reset and your machine is ready to use.