I survived most of a childhood in Denver without AC. It gets into the low 100s during the summer, but it's dry.
On the other hand, there is no way I could survive life here int he tropics without AC. Even if I could physically handle it, I wouldn't be able to stomach the effects on my personal belongings - mold, rust, etc.
I've known a few mainlanders who have moved out here and thought they were being very "islander" by living without aircon (that's what we call AC out here). Fools! Any islander who can afford it will run the aircon. I remember when I first moved out here, the first "possession" I bought was a board game - Risk - to play with our group of friends in the evening (back before the movie theater was open and half the other things there are to do nowadays). We put it away on the shelf in his non-aircon house, and two weeks later the board had molded and warped so bad, it was unusable.