You get used to it pretty quickly. And you need to because central AC is such a huge waste of electricity that in 50 years you won't have it ;-). Buy a sweater and decent t-shirt.

It's not a cost issue, as AC cost around 5-10k (https://climatisation.ooreka.fr/comprendre/prix_tarif_climat...), which is not much compared to the price of a house (150-300k), but a cultural one.