As far as controlling heat, don’t forget one aspect of architecture that was very popular then, and which has faded away with the advent of better insulation and air conditioning - the sun porch. In fact, according to some social theorists the culture changed with the advent of air conditioning, because people used to go outside on their porches, which would cause them to become closer to their neighbords. Now people shut themselves inside their houses, which erodes the sense of community somewhat.
I actually lived for a long time in much the same way people in the 30’s would have - my grandparents were poor farmers, and I lived with them for long stretches of time (every summer until I was 18, and I lived there and went to school for a couple of years when I was younger). We did not have running water, or indoor toilers. Our house was built in the late 1800’s, and was largely unchanged from then. We had an outhouse, and a hand pump in the house connected to the well (luxury!), and a giant cast-iron wood burning stove in the center of the house. The stove was used to cook supper, and the heat from the stove would warm up the house while we got ready for bed. In the winter, we’d pile what felt like 20 pounds of blankets on top of us, because by morning the house would be ice cold. Midnight bathroom runs were a real adventure.
I still remember when my grandmother got her electric wringer washer. It was a big, big deal to her. Until then, washing was an amazing chore. Hand-scrubbing each piece of clothing on a washboard. Wringing them by hand, or with a crank-operated mechanical wringer. Then you’d have to take them out and hang them on a line, and then take them down later.
When I first got old enough to work the farm seriously, I used to drive an old Case tractor that dated from the 1930’s. So I know a bit what that part of it was like. It had a hand crank on the front which could break your arm if you weren’t careful. It had a hard metal seat on a spring for shock absorption. Riding that thing was loud, hot, and very, very dirty. At the end of a cultivation day, you’d be just black from head to toe.
Which brings me to bathing. Preparing for a bath consumed at least an hour. We would heat pots and kettles on the stove, and pour them into our tin bathtub. It takes a LOT of kettles to get a reasonable amount of hot water. And then we would share all the bathwater, because it would be far to much work, and waste far too much water, for each bather to get his own fresh tub. And of course, just to heat the kettles meant hauling wood, stoking the stove, getting the fire going, etc.
The people who have really been helped by technology in the past 70 years are not the rich. They had servants. The people who really did better were the poor, the lower middle class, and women. Women, especially. I am still amazed at how much work my grandmother had to do back then to keep the household going. From keeping her own garden, to making clothes and constantly repairing them, to having to can food for the winter, she was BUSY. All the time. When we woke up in the morning, she had already been up for an hour making breakfast and preparing clothes and such for the day (and we were up at 5:30 or 6). At night, when the men could relax and chat, she would be mending clothes, cleaning, washing, getting baths ready, you name it.
The poor and middle class today live like the rich did then, because we have technology to replace all the servants, and mass production to replace the expensive, handmade things the rich had then. But the rich in the 1930’s lived fine lives. Medical and dental care lacked, but in terms of living quality it wasn’t so bad. They had electricity, and radio, and nice cars, and warm homes.