Ah yeah let me check my thermometer after a whole night of ventilation.... yeah it's still 27, down from 28 last night whooo. And this is my bedroom which is towards north.

European living in a "temperate climate" here. A decade ago, I didn't need AC. Temperatures over 30 happened for a few days at a time a couple times per summer. Heatwaves that killed old folk with sustained temperatures over 35 for a week happened once a decade.

Now it's the norm. We see temperatures in May that would only have been possible in the peak of August in the mid-2000s. We see temperatures over 35 everyday for weeks at a time. When it finally rains, it doesn't cool down anymore. It just gets unbearably humid. Temperatures at night don't fall down below 28 after a few days.

Even worse. My living room, home office and kitchen are in full sunlight the whole afternoon. I can live in the dark, but the walls have a thick insulation. Insulation doesn't deflect heat, it stores it and slows it down. It's literally accumulating heat as soon as a single sun ray touches it. Once the heat creeps through, they stay hot and radiate for a week. You could ventilate all you want, you can't fight the thermal mass of a wall heated through its core up to 45C.

Climate change transformed my mild-winters, warm-summer region into a rainy-winters, unbearably hot summers region in a few decades.

I was looking at it from an European standpoint.

Nah, I'm in Europe too and my external thermometer last night recorded a minimum temperature of 26,6°C, it's on the wall so real temperature was probably 25. My apartment is at the last floor of an old building, so insulation isn't good..

My roller shutters (external, real European ones) and awnings are automated to maximize airflow and reduce sunlight exposure, but in August my AC never turns off.