I have a programmable thermostat which I have set to come on for an hour in the morning before I get up, and it comes back on about an hour before I get home to work. My furnace(gas) then runs until about the time I go to bed, and the thermostat shuts it off for the night. My question is what should the lowest temperature be that I set my thermostat to? The temperature here right now is dropping to minus 40 at night, and my house temperature is dropping 20 degrees during the day. So basically at what temperature drop difference does it not become economical enough to heat my house back up. Make sense to anyone?
