Where to begin . . . it doesn't cool well on hot days, doesn't have decent fresh air exchange on cooler nights when you just want the fan, and is noisy. On a 90 degree day in New England, it couldn't keep my 200 sqft bedroom cooler than 78 degrees. On a night in the 50s, the fan couldn't cool below 72. It's so noisy that the manual - almost unusable on the important stuff - devotes two whole pages to all the kinds of noise this thing makes. Plus it generates condensation that drips down one side of the unit. I was better off with the 20-year old unit I replaced this with. I would have returned this if I hadn't missed the window before we hit enough hot weather for me to discover just how inadequate this is.