Window AC units exist, and are extremely easy to install. They’re nowhere near as effective as a central AC unit, but they don’t need to be. Just strategically cool the small rooms where you’ll spend a lot of time, like the bedrooms and office. The rest of the house can stay hot, because you’re intentionally not spending a lot of time there (because it is hot). That’s how lots of people in the US live, because lots of places in the US don’t have central AC but have been dealing with the high temps for far longer than Europe.

“But my windows don’t work with a window unit” I can already hear some people typing. Great, heat pumps and mini-splits exist. A single hole drilled to the outside, and you now have the ability to independently heat and cool each room.