Hey Northern #Europe, welcome to #hot summers! Here are some simple things that I do which really help, which are common practice in hot climates:

* Drink lots of water, really, lots. Careful, alcohol will work against you.
* Close all your windows and curtains in the midday heat. Insulation works both ways, keeping the heat in or out.
* Open all the windows and curtains at night, if its cooler outside.

This is probably enough to avoid buying #AirConditioning, and helps keep cool even with AC