Having lived in the south for most of my life, I cannot imagine a summer without AC. Yikes! It's been in the upper 90s here this past week. We keep our AC set at 77 during the day, and 75 in the evening. In the morning it doesn't kick in too much if it cooled off at night, but the heat accumulates during the day so it gets pretty warm in here by the evening, especially the upstairs bedrooms. The basement isn't air conditioned and stays pretty cool (that's where I am right now, ahhhh). We use our ceiling fans all summer and that helps too.
Last year in August we had a couple of weeks of 100+ temps, beginning two days after we knocked a big hole in our wall for our kitchen renovation. The AC couldn't keep up, no matter what we did to close off the kitchen from the rest of the house...ugh! We ended up hanging out in my workout room, which has a window AC unit. During that time I went to NJ for the Road Trip, and the temps there were in the 60s and 70s. I felt pretty guilty leaving DH and the kids to swelter down here!