77 or 78 during the day, when needed, & 80 at night, we have a ceiling fan going, over our bed at night, & others in the house, going during the day, when & if needed. Alot depends on your house, the windows, how well it is insulated & so on. Also, our own personal inner thermostats. I like to be comfortable, but not cold. Dh had a double bypass several years ago, so he tends to stay cool better than I do, & he now gets colder in the winter, so it takes some working together on this. We like the lower power bills too!...