In my first 31 years, I lived in a socialist Panelház / Platten Bau buildings. These have such a poor wall insulation (windows are usually double-glazed), on Su

In my first 31 years, I lived in a socialist Panelház / Platten Bau buildings. These have such a poor wall insulation (windows are usually double-glazed), on Summer nights even in night you have 25-28C, 33-35 in daytime. Most of my neighbours use their balcony to host the external unit of an AC, so they can maintain a nice 20-25 depending on the time of the day. Because there are no sliding windows because of the poor insulation, mobile ACs are not an option.