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Originally Posted by getforfree
We have an old house and very thin insulation, doublepane windows. But when the difference between outside and inside is like 30 degrees, AC has to work a lot. It was 114 today, but the night will be 72, so I hope I can open the windows after midnight today.
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I think that's what the insulation standards are based on. (The difference that the house has to be able to deal with.) Around here -30 is unusual, but it happens, so if you want your house at 70 your house has to deal with a 100 degree difference. Luckily even in the hottest place on the planet it doesn't get to 170, so no houses have to deal with a 100 degree difference on the cooling side of things. I do wonder if places like California could deal better with weather like they're having now if houses were insulated better. (I have no idea what the cost effectiveness of insulation is in warm places, but some types of insulation are really cheap!)