The Shark® Air Purifier 3-in-1 is one of the few air purifiers that have combined the air purifier the heat and the fan altogether. The Shark Air purifier 3-in-1 combined with a true Hepa filter and clean sense IQ keeps your air quality in your home clean. It cleans up to 1,000 square feet entry level and covering 500 square feet rooms. I am not sure about all that but it works in my whole small house. This air purifier with the true Hepa filter captures all the small particles in a room and you can use it with just the fan or with heat. I started using the heat right away because the cold weather has just begun. The purifier shuts itself down when it gets to the temperature you have set it too. The purifier is very user-friendly which makes it so easy to run. If you have pets this purifier is for you! This is one top-notch Air Purifier that you expect from SHARK. I Highly recommend the SHARK 3-1 AIR PURIFIER.