Yep, in the southeastern US it's routinely so cold inside that were it to get that cold in the winter, they would turn up the heat. Except that instead of wearing three layers of clothing you're in shorts and a T-shirt because it's 95F/35C+ and 100% humidity outside.
I don't think I'll ever get used to this. I don't see how it's possible even in principle to acclimate to such large swings in temperature over such a short time frame.
As a person from northeastern Europe living in Tokyo, I really hate the Japanese doing something similar -- in the summer they set their ACs to 20-22, when it's 35 outside, while in the winter everywhere inside is at 25+, quite often even as high as 28. Plus, their ACs are the 'blow freezing wind in the face' type, so it's extremely terrible for the health. I have taken to wearing a quilt+buff for the neck during the summer just to avoid getting sick all the time.
At least I sit next to a window, so I can let some warmer/cooler and fresher air to compensate, but it is such a waste of electricity, it drives me nuts.. It's also imposible to concentrate when the air gets too dry from the AC.
I don't think I'll ever get used to this. I don't see how it's possible even in principle to acclimate to such large swings in temperature over such a short time frame.