Bought two and both ran for more than a month continuously in an extremely uncomfortable basement infested with smell of mold and humidity because of water flood. Very powerful for it’s size, enough to clean the air where the 1000 sq. Ft. basement is not unbearable anymore and very comfortable. In a month or so I would think even that common smell of basement will be gone too.Update: Oct. 31 All the smell and the thick air is gone, the whole basement feels just as comfortable as the rest of the house. Although they sound like a jet engine running, can't hear it upstairs, even if I did I'd still use it, noise vs. cleaner air is well worth it for me. Extremely satisfied with my purchase.
Danielle 
