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Windows Energy Savers

 

		Windows can be one of your home's most attractive features. Windows provide views, daylighting, ventilation, and solar heating in the winter. Unfortunately, they can also account for 10% to 25% of your heating bill. During the summer,  sunny windows make your air conditioner work two to three times harder. If you  live in the Sun Belt, look into new solar control spectrally selective windows,  which can cut the cooling load by more than half. If your home has single-pane windows, as almost half of U.S. homes do,  consider replacing them. New double-pane windows with high-performance glass (e.g., low-e or spectrally selective) are available on the market. In colder  climates, select windows that are gas filled with low-emissivity (low-e) coatings on the glass to reduce heat loss. In warmer climates, select windows with spectrally selective coatings to reduce heat gain. If you are building a new home, you can offset some of the cost of installing more efficient windows  because doing so allows you to buy smaller, less expensive heating and cooling  equipment. If you decide not to replace your windows, the simpler, less costly measures  listed below can improve the performance of your windows. Cold-Climate Window Tips • Install exterior or interior storm windows; storm windows can reduce your  heat loss through the windows by 25% to 50%. Storm windows should have  weatherstripping at all moveable joints; be made of strong, durable materials; and have interlocking or overlapping joints. Low-e storm windows save even more energy. • Repair and weatherize your current storm windows, if necessary. • Install tight-fitting, insulating window shades on windows that feel drafty  after weatherizing. • Close your curtains and shades at night; open them during the day. • Keep windows on the south side of your house clean to maximize solar gain.   Cold-Climate Windows Double-pane  windows with low-e coating on the glass reflect heat back into the room during the winter months. Warm-Climate Window  Tips • Install white window shades, drapes, or blinds to reflect heat away from the house. • Close curtains on south- and west-facing windows. • Install awnings on south- and west-facing windows. • Apply sun-control or other reflective films on south-facing windows to reduce solar gain.  Warm-Climate Windows In the summertime, the sun shining through your windows heats up the room. Windows with  spectrally selective coatings on the glass reflect some of the sunlight, keeping  your rooms cooler. Buying New Windows New windows are long-term investments that have a large impact on your home's energy systems. Today, there are many new window technologies available that are  worth considering. Glazing materials now come with a variety of selective coatings and other features; frames are available in aluminum, wood, vinyl, fiber glass, or combinations of these materials. Each type of glazing material  and frame has advantages and disadvantages. Shopping Tips • When you're shopping for new windows, first, look for the National Fenestration Rating Council (NFRC) label; it means the window's performance is certified. • Remember, the lower the U-value, the better the insulation. In colder climates, a U-value of 0.35 or below is recommended. These windows have at least  double glazing and low-e coating. • In warm climates, where summertime heat gain is the main concern, look for windows with double glazing and spectrally selective coatings that reduce heat gain. • Select windows with air leakage ratings of 0.3 cubic feet per minute or less. • In temperate climates with both heating and cooling seasons, select windows  with both low U-values and low solar heat gain coefficiency (SHGC) to maximize energy benefits. For more information about windows, contact: American Architectural Manufacturers Association (AAMA), (847) 303-5664 ENERGY STAR®, (888) STAR-YES (782-7937) National Fenestration Rating Council (NFRC), (301) 589-6372 National Wood Window and Door Association, (800) 223-2301 Owens Corning Customer Service Hotline, (800) GET-PINK (438-7465) U.S. Department of Energy's Energy Efficiency and Renewable Energy Clearinghouse (EREC), (800) DOE-EREC (363-3732), and Network (EREN).