Even when we moved to Texas, in the early 90s, lots of people lived in small homes, some with no air conditioning or central heat. You were doing pretty well with a rancher the size of a mobile home and a swamp cooler or whole-house fan. And lots of trailers. Most of my relatives lived in trailers.

They would have screen doors, front and back, and they would open both and let the air through, to cool.

And always only one toilet.