Thanks for clarifying. Yes, I have also seen the online discussions that say "just install air conditioning, duh" that never address the root cause of the issue. Elsewhere in this thread I posted some comments about other ways to deal with a warming climate, though they don't have the technological cachet of airconditioning and they don't allow people to cool down at the touch of a button! For example, shading sunny windows with deciduous trees.
Where I live, I do have a heat pump. But I also have hop vines which grow up the windows that receive the worst of the summer sun. Some people may prefer grape vines which can serve a similar purpose. The house has solar PV on the roof to offset some of the electrical load - in the day time in summer, the AC is effectively "free" to run, and the panels shade the roof, which also helps keep the interior cool. There is a deciduous tree which shades the morning sun in the east and fruit trees which shade the afternoon sun in the west. The roof, walls and underfloor are all insulated, even though I live in a "temperate" area. The windows have screens so I can close them during the hottest part of the day and open them in the cool of the night, without worrying about insects.
As for airconditioning in Europe, I think a priority should be to install AC in trains and buses. The passengers can't do anything about a train schedule that requires the train to sit in the hot sun at noon, but they are the ones who have to deal with the heat.