Years ago, many people in northern Nevada did not have AC because the nights cool off so much. However, in the 28 years, I have been here we have become the fastest warming city in the nation.
During the summer, our heat gets up to the high 90s and low 100s. For instance, last night our low was only 67. I don’t know anybody that doesn’t have central air.
When I lived in Wisconsin many people did not have AC. It can get hot and humid there, but not usually consistently in the summer. Sometime during the 80s we had a really hot miserable summer and we tried to buy window air conditioners for the bedrooms, but we couldn’t find any to buy even in the big cities of Chicago or Milwaukee.
By September, they were back in the stores and we bought one for each of the three bedrooms although by then we didn’t need it. We used them every summer after that and it was really nice to be able to sleep well. Now, all my friends that have stayed there have installed central AC in their homes.