We heat with gas and keep the thermostat set on 70 during the winter months. Jack prefers 75, I prefer 68 so we comprised on 70. We keep a little electric radiator type heater in the den and he stands in front of it most of the day.
Electric and firewood. We keep the thermostat at 69 during the day and turn it down to 65 at night. This is the first year we have burned wood in our fireplace in a long time, but we had a big tree get knocked down by high winds this summer and decided since we had the wood readily available that we would use it up!