Ours is set at 67F all the time. Two days a week, we have a sitter come to the house so we want it comfortable throughout the day. We also have a wood burning insert that keeps the living room/dining about 70F. The bedrooms stay much cooler, since the thermostat is about 5 feet from the wood burner. Before we had kids, we'd keep the house around 64-65 (and use a wood stove in the family room), but our 3 year old is not capable of keeping covers on his body all night, so I don't like to let it drop that low. I have found that the temperature of my house has a direct correlation to my mental health in the winter. We can easily go all summer without using A/C, but I cannot tolerate being cold in my house. I layer up at all times, and rarely got too warm, even when standing directly in front of the wood burner. I've had my living room up to 78F at times, and I still had a blanket on. My internal thermostat is broken, and my psychological well being depends on me not feeling like I'm risking frostbite inside my house.
Semi-Related story/rant: When I was growing up, my dad and stepmom heated with a wood stove and kept the central heating set VERY low, with the stairway to the bedrooms closed at all times. My stepmom is pushing 60 years old and has permanent nerve damage in her feet due to suffering frostbite INSIDE her house. Now that they are empty-nesters, they have built a new home and have filled it with absolutely useless amounts of stuff. My dad has had to build 3 pole barns to hold all of his auction/swap meet shit. They each have multiple vehicles, etc. I just want to ask them...was it worth it? Was it worth being so frugal all those years, just so you could blow your money on useless shit now? (and no, it wasn't that they couldn't afford heat way back then) /end rant