Main house: forced steam/radiators with a simple programmable thermostat. Addition (large family room): forced hot water baseboard with an old-school dial thermostat.
But there is only one zone. When you turn up the heat in the addition, all of the house radiators heat up and heat the rest of the house. It's absurd.
Having just moved into this house and do not have money to burn, I'm looking to determine what - if anything - I should do to make this arrangement the most efficient. Just put a programmable thermostat in the addition to time things correctly with the main thermostat? Just accept the fact that I need to crank the heat in the addition for warmth and that the rest of the house will be warmer than I need or want?