When at home, use 68° to 72° as your winter set point. When you leave the house, drop the thermostat to 55° to 60°. And at night, set your thermostat to 65°, which, according to the Sleep Foundation, is the best temperature for sleep. Using these settings can help keep your winter electric bill low. Your family won’t protest as much if you drop the temperature by one degree each week. That lets everyone adjust to the lower thermostat setting.