They definitely exist, and are very cheap. I got one for 200, gave away to a friend when I moved out of an attic apartment. They have a window-attachment access

They definitely exist, and are very cheap. I got one for 200, gave away to a friend when I moved out of an attic apartment. They have a window-attachment accessory that makes it easy to attach to those European windows. The real reason most of us don't have AC is because it's hot for a very short period. Last year it definitely wasn't too hot for me to warrant having one. This year so far, it was, for a week: we had about 30°C (86°F) last week, but next week my mobile phone promises it's gonna be 20°C (68°F) maximum, which does not need AC. Maybe that will change, though.