AC is probably more common than it used to be in relatively wealthy countries in a certain band than it used to be, especially for newer construction. I'm not s

AC is probably more common than it used to be in relatively wealthy countries in a certain band than it used to be, especially for newer construction. I'm not sure it's so much changes in temperature as it is just overall expectations changing. I live in an old house in central MA in the US and I'll sometimes turn on a window/portable AC unit for a handful of days a year but I'm certainly not paying to have central air installed. Undergrad in the urban Boston area the older dorms certainly didn't have AC.