I was outside bbq'ing last night and I heard our AC kick in. So I'm assuming it'll be a while before the heat gets turned on. I think the AC is set to 74, so it hasn't gotten below that in our house yet. New windows and 2 feet of attic insulation really helps hold the temperature in the house.
Once it drops in temp we'll have to keep it on, since we have an infant in the house.