The heat really annoys me a lot too. I am a winter child. But luckily we live in a well-insulated old building with thick walls. After the last heatwave, the warmest room briefly reached 27°, normally the temperature in the house doesn’t rise above 25°, and that even though the house is in the sun from morning until evening (west-south-east, to the north is the neighbor). In the attic, we keep the windows open on all 3 sides at night and air out the rest thoroughly first thing in the morning. On the ground floor, we don’t leave windows open at night due to the risk of break-ins, and not on the first floor either because that’s where the children sleep. And we shade everything immediately after morning airing (unfortunately no exterior blinds except in the attic). That way we get through these temperatures quite well, even without air conditioning.