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They provide a bit of a barrier between the outside and your house, so during winter the cold wind can't just blow straight inside, or it can make the house colder if there would otherwise be no door and hole in the wall at all. During summer, though, in some places doors would definitely help keep your house cooler than if there were a hole in the wall, but not cooler than if there were no door or hole at all.

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11y ago

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