You can purify as well as heat up or cool down the air with Dyson Hot+Cool air purifiers. That's because these Dyson air purifiers have a fan function and heating function. With the fan function, you can provide a cool breeze on a hot day. Is it cold? Use the heating function to heat up the room to the set temperature. These air purifiers also ensure cleaner air, of course. With the filters, they remove dust particles, pollen, bacteria, and gasses from the air.