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Agreed but that’s sadly not the case for most US buildings.
Source? Generally, construction methods in the US include significant insulation especially in retail, office and residential construction. Malls and office buildings retain higher internal air pressures to keep the hot air from getting in. It's why many shops give you that cold air breeze when you open the door.
Aroogah-
Source?
Here’s one.
https://www.hersindex.com/articles/vast-majority-u-s-homes-insulated/
Muc-ed-off
Agreed but that’s sadly not the case for most US buildings. Although most do have doors.