During the day if I can open the windows I will. But right now it's just too hot until probably late September and the A/C is set on about 78. I can't leave it off when we're not home because it would be a furnace in here otherwise and we have the pet's comfort to think about. I run colder than my husband so we battle sometimes over the temperature. The only time I like it really cold is at night. I can't stand to be hot when I'm sleeping and set it at around 74 or 75.