Air purifiers with a heating function also heat the air in addition to cleaning it. That way, you also have a warm and comfortable air flow in your house on a cold day. You can set the desired temperature. The air purifier then heats up to space until it reaches the set temperature. These air purifiers also remove dust particles, bacteria, and gases from the air with filters. Want to clean and heat the air? Go for a Philips or Dyson Hot+Cool air purifier.