Where it's hot, people come home from work as the sun is setting, and turn on the A/C. It can be 85F overnight in many parts of the world, which makes sleep very difficult.
Yes. Our house in Australia is reasonably well insulated, but if I turn off the A/C, it feels warm again within about 15-30 minutes. During summer, it can remain 30C (86F) overnight, and higher than that well into the evening. Recently in Oman, the overnight minimum didn't drop below 42.6C (108F) overnight.
A "reasonably well" insulated house by Australian standards is still laughably poor compared to modern European standards. We build rubbish houses here, and we can't insulate worth a damn.
