I sometimes wonder how I managed to survive the summers in New York City and Japan with absolutely no AC. Since I never experienced AC except in stores and such I guess I never really knew any better. All I used was a fan. I only had AC during my last 4 years in Japan and didn't even have it my car yet. It was still an expensive option then. But it was only in one room and we still slept at night with just a fan.
Besides, in my first 5 or 6 years in Japan there wasn't even any AC on the trains! Imagine that after speed walking to the train station!
Today I am quite spoiled with central air in the house, air in the car, and air in my truck for my long drive every night. I constantly move from controlled environment to controlled environment. I have a feeling that I will be in a world of hurt, psychologically, if I suddenly had no AC. Especially since last week temps here were approaching 40C!