It works very well for our basement. Our basement is only 900 sq ft. So this is overpowered for the room, but that's why we bought it. It has helped the air quality so much and my boyfriend states "it feels like I'm breathing in hospital air". I like how the unit tells you the ppm quality so it really shows you how much particles are in the air. It's also pretty quiet so it's not too much of a nuisance. Since we got it my cats and dogs have loved hanging out in the basement.