I live in a 1400 sq ft 3 bedroom condo in San Diego.  Our HOA prohibits window fans, so instead of mounting this fan in the window, I've mounted it in the access opening to the attic. This fan fits perfectly in the standard sized ceiling panel (16x22) opening leading up to the vented attic above my condo.  This fan pulls a lot of air through all of the rooms, creating a nice breeze and keeps my electric bill low by reducing my use of AC.  It is relatively quiet considering the amount of air it moves.  I'm rating this a 4 instead of a 5 because the control dial works well enough but it feels flimsy, is made of cheap plastic and comes off too easily.