We use this in our upstairs bedroom as our house is old and we don't have central air.  If you're looking for quiet - this is it!  If you put it on quiet mode, you'll barely hear a whisper.  The only reason I'm giving this 4 stars as opposed to 5 is that the AC only goes down to 64.  This is normally plenty cold for most people but being that we're in a bedroom upstairs and my husband runs hot, I wish it could get down to 60.  Other than that, fantastic unit, easy installation, and a good buy!