This little AC unit is really impressive. We installed it in the guest bedroom so that the little noise it does make doesn't bother us when we sleep. But the white noise is in fact very subtle. What's really amazing is that the one little unit in an upstairs bedroom is cooling almost the whole house (about 1,200 sq ft). The cool air and reduced humidity reaches down the stairs and reaches at least two-thirds of the main floor as well as perfectly cools the entire upstairs. It is exceptionally quiet inside and out, which is a huge bonus. We have only had it installed for a few days, but the Temps have been 85-90° each day and it remains noticeably cooler inside the whole house.