I am under the impression that a lot of people live in rented flats, and good luck having the landlords put some insulation and have the apartment unavailable f

I am under the impression that a lot of people live in rented flats, and good luck having the landlords put some insulation and have the apartment unavailable for some time instead of just renting it to a new person. Although it seems F and G flats will be illegal to rent soon in my city, so that could help. Meanwhile, I've had single pane windows in most of my flats. Can't wait to move somewhere better insulated (I can hear the wind hissing through small gaps in the sliding windows right now). This is in a major city in France.