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One year I used a 20 inch fan on nights where the 11PM temperature was in the 70's. It worked pretty well, pulling air into the Living Room into the hall and out the bedroom . But putting the fan IN the window at 11PM and taking it OUT at 8AM proved to be an annoying chore involving a wood panel to fill the space along side the fan.
Street noise in the bedroom was annoying as well as light infiltration without tight draperies.
So now it is AC only...electric is included in maintenance so bill is a constant.