> Massive museums in Munich don’t have air conditioning.

Are you sure it wasn't just broken? Large commercial spaces do tend to have it, because lots of people produce lots of heat. 100 people in a room is ~equivalent to running a 10kW heater constantly. Unless the temperature outside is _reliably_ under about 20 degrees (in which case you can maybe get by on active ventilation) you're going to need it, really.

> We were in Germany and Italy during a heatwave this summer. In Munich I managed to find a hotel with aircon, in Italy I didn’t.

Okay, I'm sorry, if you couldn't find a hotel with aircon in Italy you weren't looking too hard. I just went on Google Maps, searched hotels in Rome, took a random 70 euro/night hotel (an Ibis Budget), has aircon. I'm pretty certain just about any of the budget chains will have it, never mind the higher end ones.

Yes, I’m sure it wasn’t just broken. Feel free to google if the Deutsches Museum in Munich doesn’t have air conditioning.

We weren’t in Rome.