I didn’t see anything meme-like in the comment you responded to. Or even anything related to environmentalism. To me, it just looked like good health advice.

In case you don't know, there is a meme in the US that Europe don't know/don't have A/C. We do, but in some coutries there are laws banning A/C below 25°C (77°F) in public places, so (US) tourist don't get the cold air hit when entering a building like a musseum, leaving with the impression we don't know A/C.

No general A/C might be the case in regions that never needed it before (mild summers, cold winters), but their presence is increasing.

It was fairly impossible to find a restaurant in Paris that had an AC not so long time ago. It’s totally not an issue in states.

That's because Europeans are more of nonconformists and could deal with some 7 to 10 super hot days in a year. It's now weeks in a row.

There are still hardly any, Paris, July '26.

Something like 90% of US residential buildings have AC. For Europe, it's around 20% (for good reason, mind you). It's not a meme if it's an actual fact that many European homes are not prepared for these kinds of increasingly common heat waves, and I got the impression that the parent was showing genuine concern.