Staying cool in the summer was all about being outside to hopefully catch a cool breeze. Some of our family would literally take a bed outside to sleep in the cooler night air because a house will hold heat. I remember sitting between wet bed sheets on the clothesline.
I know for a fact that several of these children lived into their nineties because they were my Grandparents and Aunties and Uncles. They drank milk from the cow and played in the dirt. They ate meat from the farm and id not need electricity to live.
I am sharing a link to a couple that lives off the Grid with no solar power and more like people did in the past. They have a youtube channel and power the equipment they need to do the videos in a very brilliant way. Here is the link to off the grid with Doug and Stacie. I think you will find some very good information on their channel.