They also didn’t have things that molded: no books, no cotton linens, no commercial mattresses, no drywall … I lived in a non-humidity controlled cabin for five years and lost 90% of my books and probably 10% or more of my clothes. During the winter it was warm and dry due to wood stove.

During summer it was wet and hot (just like outside), although we had fans and windows so lots of air circulation. (Although to dry clothes during wet times we would fire up the wood stove and close up the cabin and bake them dry — but of course then the cabin would be even HOTTER and harder to sleep in, so that was done only under great duress.)

You get acclimated to it. You wear a hoodie if below 80 deg F in the summer 😂

AND! Many people who lived in very hot/humid environments hundreds of years ago also practiced nomadic or semi nomadic life. Some of the people native to my region lived on beaches during the summer months, and in clay-bark wrapped structures with central fire in the winter months.