> Older European cities with high-density stone buildings and less green space often trap heat more effectively than typical U.S. suburban layouts.

Doesn't that mean that they would need AC, then? At least for those specific buildings.

However, as a European living in Paris, one of the densest cities in the world, I only feel the need for AC like 2-3 weeks a year. I think the issue is that most people dying of heath are already very old and much more sensitive to it.

But if you live in any kind of share building, you can't just go and set up a split. If it is outside the building, you need permits, both from the architects, so that you don't deface your ugly concrete building, and from your fellow residents, who usually vote "no" by default.