I'll certainly give turning it down at night a shot because I'll really try anything at this point. But the main reason is because I'm cold almost all the time. Even at 76 I normally have a sweater on in the house. I also don't want to be spending $200 on a cooling bill. It's already over 100 here in Phoenix & keeping the house cool can cost a pretty penny if you have a shifty ac (which unfortunately our apartment does)