You'll make your heating system run more efficiently, and you may help keep it running longer.
How low can you go?
Every degree you set your thermostat above room temperature (68° F) uses 3% more energy. To save energy and money, lower your thermostat to 60° F at night (and when you're away), and set it to 68° F during the day. Want to go one step further? Install a smart thermostat.