| $ | Set thermostat to 68°F when you are at home and 60°F when you are sleeping or away. Open the blinds and curtains during the day to set the sun in. Use a space heater to warm up the space you are in, if necessary. |
| $$ | Caulk doors and windows to block any air drafts (DIY) |
| $$$ | Upgrade furnace to be more energy efficient (info) |