We keep ours at 62°F when we are home and awake. It is scheduled to drop to 58° during times we know we’ll be gone (like at work), as well as overnight. Our thermostat also has an away setting that kicks in automatically during the day and if we leave the house for a while, which drops it as low as 56°.
Usually it’s not too bad and we just wear sweatshirts and slippers around the house. If one of us is not feeling well, sometimes we’ll bump it up to 64° or 65° to ward off the chill.
If we have company, we’ll usually bump it up to 68°.
In the summer, the only room with a/c is our bedroom, which we will set as cold as 72° at night, but otherwise we just open windows and keep ceiling fans going.
Ed.: I wouldn’t mind keeping it more in the 65-8° range, but I like the money savings, too. Our old apartment had no insulation—you could feel a draft through the walls in the living room!—so we got used to it then. Now with a house twice as large, our heating bill is half what it was in the apartment.
P.S. Outdoor Girl, the ° symbol is alt+shift+8 on a Mac