Every time you complete this action, you will reduce emissions by an estimated 8 lbs. CO2e.
Turning your thermostat down 10°–15° for eight hours can save 10% a year on your heating bill. So set your thermostat to 50° or 55° when you go to bed and when you leave for work. If you don’t want to have to turn the heat back up in the morning or when you get home, get a programmable thermostat that turns the heat on or off at preset times.
It does NOT take more energy to re-heat your house after the heat has been turned down than to keep it at the same temperature all the time. Nor does turning your thermostat up make the house warm up faster — it simply makes the boiler stay on longer before turning off.