In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
Unoccupied house temperature setting
For a house in Maine that at least some winters will be unoccupied, I need advice on the following questions. Note that conditions are a gas-fired boiler feeding radiant on 1st floor and HWBB on 2nd floor. Assume insulation to meet local standards [at least] Assume home may not have an occupant from Nov to May [most/many winters]. Plan is to use antifreeze/water mix in the heating system. House plumbing would be "drained but perhaps not fully evacuated."
1) Is the best plan to leave the heating system running but at a lower setting? I have assumed yes to protect the house condition.
2) How low can I lower the zone settings considering a desire to conserve energy/costs balanced by not risking the home? Would 40F be too low?
3) Given the type of heating system described above, is there a point of "no or low payback in energy saved" if temperature is set lower?
As always your expert advice is appreciated!!!