Fifty years ago any area outside of the south was not likely to have residential air conditioning. That has changed and now even the formerly cool west is building homes with central air.
But of course there is no global warming, the summers are not getting hotter, this is all a hoax by scientists who want to enslave the economy and by air conditioning sales folks.
All New Houses in the South Today Are Built With Central Air
Share of new single-family homes that have central air-conditioning.