The US Midwest, as well as much of Canada, is built like that. Winters are long and cold, so houses are more or less built to keep heat in, but not to keep heat out, or cool down quickly once hot. I say more or less because historically energy has been so cheap that instead of properly insulating like people do in Europe for example, many just turn up the heat in winter. So even when people can afford to buy and run an AC unit and the power grid cooperates, the AC can often only cool one room, and maybe not even quite handle that sufficiently.

In historically temperate areas like the pacific northwest, homes aren't really built with extreme temperatures in mind, so anything outside of the usual 5-25°C range is very uncomfortable very quickly.