Let me put it this way:

My grandparents built a brick house in the early 1950's in northern Germany. My parents built on that foundation and doubled the size in the late 1980's. Air conditioning was not a thing back then. You just didn't need it at all.

For decades this house has kept a relatively cool 24-25°C (~75°F) during peak summer months. Just due to the way it was built.

That hasn't been true for the past ~10 years anymore.

And it's the same with almost all German infrastructure. Our traditional ways of building things are not fit for the frequent high heatwaves we've been experiencing this last decade. Even hospitals are generally not AC'd except for maybe ER and operating rooms. It's fucking miserable