Well, there is a limit to what temperatures you can get used to and survive. Somewhere above 130f/50c your body cannot cool you down effectively anymore, and yo

Well, there is a limit to what temperatures you can get used to and survive. Somewhere above 130f/50c your body cannot cool you down effectively anymore, and you literally need an AC to stay alive. It's not an issue of getting used to it, though old folks will obviously be more vulnerable. And don't take electricity for granted, heat stresses the grid and power plants need cooling. So there are some physical limits, including limits of the human body, it's not just an issue of getting used to it.