There was one sweltering Summer where the classroom's air conditioner was hyperactive, and we measured it at 60°F in there. It was an unpleasantly humid, high 90's °F outside.
So we'd walk to school in shorts & T-shirts, and put on sweatpants and sweatshirts before going into lecture. It was silly. We had to keep warm clothes in our lockers outside the classroom, and during lectures would slug down hot coffee, tea, and cocoa to keep warm.
We called building maintenance repeatedly to complain, without success. I remember at one point a frustrated guy actually dialed them during a lecture, and screamed "DO YOU HAVE ANY IDEA HOW COLD IT IS IN HERE?" into the phone.
The next day we got to class to find they'd hung up a large wall thermometer, so we could see how cold it was (59°F).