[difosfor]

I'm not saying it's as hot here as it is in Florida. But we've been breaking records left and right up to the point where I've purchased an AC (a crappy mobile one for lack of better options here for rented apartments) because we go through months every summer now where I can barely sleep without one anymore.

My point was that people often don't realize how humid it is here. You apparently also can't believe it. And how our buildings are not made to keep heat out, but rather in. So I expect many more ACs to be sold here as well in the coming years.

It might just be a month or two each year. And it might be worse for you. But it's also getting pretty bad here already thanks to climate change. And that's not going to improve anytime soon thanks to all of us.

[quantified]

Is it possible to build so that hear is kept in but not out? I sort of thought that heat flow was bidirectional.

[difosfor]

Yes, mostly by using insulating (double) glass to let warmth in in the form of light that then warms up the interior. Think greenhouses. Surround that with poorly insulated walls and limited ventilation and in cold weather they'll leak out heat while in warm weather they'll also heat up in the sun and radiate that in.