My room is fairly dim, thanks to decently thick curtains, and between the air conditioner and two fans, I actually have to use a blanket. Not bad for the beginning of summer, those days that hit the high 80's and drive us insane, but that we'll be begging for when the temperatures begin to reach the 100's.
If this were winter, it'd be the complete opposite. We'd be shying away from this and attempting to warm the house. Ideally, it's one temperature all year round - the same one, though the effect is different - one that's warm enough in winter, cold enough in summer.
Funny how that works, isn't it? Temperature means something different depending on the season, on the weather, depending on where you are, what you're doing, the mood you're in. I guess everything does.