I considered the original question to mean: "Does / would the use of AC help?"
to which tangential, interesting information was provided but left the original question unanswered.
Are we to assume literally nobody has an AC nor is it possible for AC to even exist in those situations? Because if it helps, then maybe something productive can come out of this conversation where we can aim to improve some of these living conditions through use of AC's - which would kill 2 birds with one stone.
It seemed like a genuine question that should be actually answered. I want to assume "yes" they would help, but I'd be guessing.
AC alone wouldn’t make any difference whatsoever. You need a modern HVAC system that exchanges air with the outside with something like an ERV or HRV. And even before doing that you have to make sure the building is sealed and insulated properly so the air is going where you need it to go. It’s actually a fairly complicated problem that starts with the design, building materials, and construction processes of the building itself.