Keep your energy bill and your pollution output low this winter by taking a whole-house approach to heating. Start with setting your thermostat as low as is comfortable. A programmable thermostat can help by adjusting the temperature according to your schedule -- it can cut back heating at night, for instance, and turn it up again before you rise in the morning. Weatherize your home -- caulk and weatherstrip any doors and windows that leak air. Make sure your equipment is properly maintained and cleaned, and regularly replace furnace filters. Finally, insulation is inadequate in many homes. Check the insulation in your attic, ceilings, exterior and basement walls, floors and crawl spaces to see if it meets the levels recommended for your area. Check out Heating and Cooling for more tips. This tip is brought to you by the U.S. Department of Energy and ISU Extension.