You know why the AC is not common in residential buildings? Because they are build with stones and concrete and can handle a few days of heat during the summer. Close the windows and curtains during the day and let fresh air at night and you'll be fine during the summer in Germany.

Yes. This year's heat waves were perhaps the first time in my life when simply closing the window at day and airing it out at night wasn't enough as nights rarely went below 20°C for almost two weeks. Usually you'd get one or two tropical nights a year.

There were like 16K heat related deaths in Germany this summer. Seems like it’s not working.