[DougN7]

Many years ago I lived in a brick apartment and the afternoon/evening sun would hit the wall next to my bedroom, making it very hot at night. I started going out with buckets of water to splash on the wall a few times each evening and it made a real difference. A white sheet hung across the wall might have helped more. Lots of things can be done if you don’t mind looking silly :) Unless you’re in the an area with high temp and high humidity. That is bad.

[throwawayffffas]

Retractable awnings are very common including in residential setups in southern Europe.

[vladvasiliu]

Do those also cover the apartment walls? I've only seen large awnings covering walls in detached houses, and even then it's relatively rare to cover walls that aren't close to doors.

[throwawayffffas]

Usually no, most of the times the walls that have the longest sun exposure have terraces/balconies and awnings.