No air in the house, at least, not till very recently. My buddy is moving to Hawaii for grad school, and sold me his air conditioner, it's one of those portable ones with the vent hose that goes out the window... So my room now has air. Since I put it in, I can actually sleep WITHOUT tossing and turning all night, and I'm not waking up anywhere near as dehydrated as I have been, so in turn, I feel a heck of a lot better during the day.
Personally, I am happy between 60 and 75 degrees. Any hotter than that, and I am uncomfortable. Colder than that, we're getting into the coat range, it's short sleeves anything after 65. The unit in my room is set to 75, according to it's thermostat, not sure how accurate it is, but the simple act of taking the humidity out of the air makes a world of difference. Because of the Great Lakes, after all, Michigan is a VERY humid state, one of those things that you just don't notice 'cause you live here, but it's everpresent. It's nice, after working outdoors in the hot sun, then in the hot kitchen (and the air is broken again), to come home and cool off a little.
We're under a severe weather warning for high humidity and heat right now through Tuesday... Glad I have it.