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Reading through the article suggests that they aren’t completely airtight, rather that the air comes in and out through mostly only through specific paths, with some sort of system that exchanges the heat with air leaving the house, so that the heat (or lack of heat if keeping the building cold) does not leak out much when the air circulates through.
Reading through the article suggests that they aren’t completely airtight, rather that the air comes in and out through mostly only through specific paths, with some sort of system that exchanges the heat with air leaving the house, so that the heat (or lack of heat if keeping the building cold) does not leak out much when the air circulates through.