That's also true in Denmark (everything is built for the winter). Although since it doesn't get that hot, rather than AC, it would suffice if things were just b

That's also true in Denmark (everything is built for the winter). Although since it doesn't get that hot, rather than AC, it would suffice if things were just better ventilated. There are 2-4 weeks every summer where office buildings, the metro, buses, etc. get incredibly hot (e.g. 35º inside when it's 28º outside), which could be fixed with better window-opening technology. On the other hand, very few people will be in the office during those 2-4 weeks anyway, since everyone just takes that time as vacation. And apartments (unlike office buildings) typically have good ventilation.