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Say that you've already covered up all the windows (although heat will still be transferred through heating the windowshades).

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Surely 42 is the answer to this question as well... ;) –  Tester101 Jul 26 '11 at 2:22
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closed as off topic by Tester101, ChrisF Nov 23 '11 at 12:19

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1 Answer

up vote 4 down vote accepted

Whenever it's cooler outside than it is inside. But you have to factor into the equation the humidity, breeze, impact of sunlight since you can't keep the blinds down, etc. And if you open the windows, the humidity that enters the home takes time to be removed by the AC.

Personally, I wait until the outside high temp is about 5F above my target temp, and the lows are much lower. Then I open the windows at night, and close the windows and blinds during the afternoon if it's getting hot out. I also only bother opening a handful of windows, on each side of the house for the breeze, and high and low for the chimney effect.

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+1... just for answering. –  Tester101 Jul 26 '11 at 2:23
    
It was a coin toss between answering or voting to close. It looks like I was in a good mood this day. :) –  BMitch Jul 26 '11 at 3:03
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