My learning thermostat is called "Hey hon, Start a fire dammit." Got some good old thermo's that are set at 55 to keep the house from freezing and a good quality wood stove with 6-8 cords per year. Truthfully, the house is ICF with lotsa south facing windows. Most winter nights, it'll only lose a few degrees inside. Unless it's overcast all day, the heaters rarely kick on.