my apt is a 2 story configuration. I leave the upstairs windows open while at work and it usualy gets to about 77degrees down stairs, abit warmer upstairs. When I come home at about 7pm I open the down stairs windows and the breeze sucking up through the apartment cools it to about 73 on its own.
I have only used the a/c a few times when the windows opening dosn't drop it below 83, then its only on for about 2 hours till the sun goes down.
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