Terrific product. I used it in my basement first and it cleared the air within an hour. Moved it upstairs and keep it in the living room. Very quiet and the air seems cleaner. It's interesting to see the numbers move up and down as it cleans the air. So far, I'm very happy with this purchase. It's a little bigger than I anticipated and it would have been nice to have wheels to ease moving it around but, it's not too heavy to pick up and move.