We don't exactly set a thermostat, or rather only a crude one. Our only heat, really, is a pellet stove insert to the fireplace. But that's more than enough even on the coldest days we get to keep us quite comfortable. But we generally set the thermostat that controls it to 20 degrees (68 F). But since the thermostat is next to the fireplace...
Mostly done with that first mug of Scottish Breakfast. Perfect on a day like this when the fog is so thick I can't see the other side of the road. Time to make another pot.