Reduce, but don't turn off heat completely, heat to areas of the home that are not used. Keep outside doors closed and reduce trips in and out of the home or apartment. Once the energy audit is complete and the findings known, adding weather-stripping and caulking where needed with reduce air infiltration. Keep air filters clean. It is recommended to check them monthly.
Most manufacturers recommend replacement monthly during the peak heating season.
If you know you will need to replace a furnace, choose heating equipment that is properly sized for the house. Dress in layers, adding sweaters or sweatshirts when you reduce the thermostat setting. Normal levels are around 70 degrees, but you can make substantial savings by reducing the thermostat setting 2-3 degrees. This information was gathered from the Minnesota Energy Resource Center, Louisiana Cooperative Extension Service, Northern States Power, and the Wright-Hennepin Cooperative Electric Association. This is a three-panel display.