I have a basement apartment so an air conditioner is not really necessary but a fan to stir the air is sufficient. This fan can be adjusted to fit a window and even lock in so it doesn't fall out if you open the sash. It can be adjusted to low , med or high and can be used to bring air in or pull air out. It's light weight, has enough cord and so far has been enough even for 95 degree days. It is energy efficient. The only problem I have is that it is LOUD. It doesn't hum or buzz but it has a loud wind sound. If I am in bed I have to turn my television way up just to hear.Probably wouldn't be as much of an issue if the window wasn't right over the bed. Take that into account. The openings are very small so little fingers would be safe. I am NOT an affiliate of the brand but inadvertently clicked it and it won't let me undo.