I worked several years designing and installing commercial hvac systems in Switzerland. Plenty of offices, banks, museums etc. have ACs. It’s definitely allowed. But you will need a permit to install a fixed system if it affect/changes the building facade.
The reason why most homes don’t have one is that it’s too expensive for the 3-5 days a year you need it. Especially the new minergy houses can keep cool very well even during summer without an AC.
The reason why most homes don’t have one is that it’s too expensive for the 3-5 days a year you need it. Especially the new minergy houses can keep cool very well even during summer without an AC.