In Croatia more than 55% of households have AC installed, and only 10 years ago it was less than 25% of households. It got more popular as our summers are getting increasingly more hot and humid. Average salaries in France are probably double compared to Croatia. It definitely can't be classified as luxury if more than half of the country can afford it, in one of the poorer EU member states. I assume in the next 10 years it's probably gonna be 70+% of all households.

Regarding technical sophistication, AC is more or less using the same technology as a fridge, just scaled and adapted for room cooling instead of food storage.