Depending on if he lives in a apartment some country/cities have laws against doing any work in the appartment that impacts the outside without permission from the house owner.

E.g. you can buy a heatpump but you can't drill the hole in the outer wall.

In germany and austria most if not all windows also either open fully to one side or basically bend inwards so you can't install the ac units you install directly into the windows[1].

[1]https://external-content.duckduckgo.com/iu/?u=https%3A%2F%2F...

edit: qualified the law statement

It can be hard to justify the cost of installing and maintaining any form of household cooling in colder areas of Europe. Additionally a lot of apartment buildings don't have them, and most landlords probably wouldn't appreciate a tenant installing one without permission. Evidently heatwaves are becoming common enough now that most people should probably keep a window AC unit ready in case of emergencies though.

As an European from Spain, in south European countries air conditioners are essential(Greece, Spain, South Italy, South Spain, inner Portugal). But in other countries or places it is not really necessary(north of Spain, France, UK, Germany).

Some days of Summer it is hot there, and they are not prepared for that like people of the South of Italy or Spain, and there is chaos.

It is like when it snows heavily in Madrid: https://en.wikipedia.org/wiki/Storm_Filomena In places like Austria or Switzerland it would be routine. They are prepared and it would be not a big deal, but in Madrid it stopped everything for two weeks.

Usually, living in an apartment.

He also says it's 32C, which is slightly less than 90F.

Interestingly, some people would describe that temperature as only "warm". I recently watched a video of a machinist working in his shop (southern US) saying that it was 94 and "a little warm".