If you have an air conditioner, at what temperature do you decide to turn it on?

I'm wondering if you have a higher tolerance for heat than I might, given that you're from an area where the summers get significantly hotter (even if drier) than me. At what temperature do you decide, "ok, it's too d\*mn hot, I need to turn on the A/C." Obviously this depends on your income and how much you're willing to pay for electricity, but I'm curious what people say.