When we first moved to TX from MI, we had it set pretty low, around 70 and it was perfect for us. The problem was that our electric bills were between $300-$400 a month from May through September. We had to find a way to cut down that bill, so each year we raise it a little and our bodies have adjusted. Besides, when it's 95 outside, even 80 inside feels like relief!
It only feels better for a second when you come in, then it feels like it's 80!
Sell things. Sell the children. I don't care, I'm selling something or taking out a second mortgage or whatever, but if it's 80, I'm putting the ac ON (actually usually if it's 75...), not going oh, that's fine.
Of course, this is one of the many reasons I wouldn't consider moving to Texas.