Is it typical for windows in apartments in Lima to let some air go through even when the windows are "as closed as possible"?
Examples (red rectangle indicates air going through):
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Some answers in the comments:
In general yes. You will see a lot in South America. There is not much need for better insulation, and because of gas (hot water, and kitchen) where is need of ventilation. But so often (but on private properties) there is a sign about not putting something to block ventilation. – Giacomo Catenazzi ↵ Dec 17 '19 at 11:24
I don't know about Lima but I have seen similar things in São Paulo. There was no heating in the apartment, and I don't think there was even AC – Peter M ↵ Jan 20 at 22:11
This is also true for pretty much every home in England. ;-) It's called involuntary ventilation and a product called "double glazing film" is quite effective at stopping it. – gerrit ↵ Jan 21 at 8:45