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Replacing your old windows with double pane energy saving windows can save you 20% on your energy bills and reduce CO2 emissions by about 1,500 pounds every year. You’d also be pleasantly surprised to discover how affordable new energy windows can be.
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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 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.
Replacing your old windows with double pane energy saving windows can save you 20% on your energy bills and reduce CO2 emissions by about 1,500 pounds every year. Alternatively, try low emissive glass, which allows the same amount of visible sunlight to pass through the window as normal glass but has a special transparent coating that restricts the conduction of thermal energy. This minimizes heat loss during cold weather and heat gain during hot weather. If you're on a budget, opt for storm windows, which are a less permanent, but reasonably effective or apply an adhesive insulating film to the glass in the fall and peel it off in spring.
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You can use a heavy-duty, clear plastic sheet on a frame or tape clear plastic film to the inside of your window frames during the cold winter months. Remember, the plastic must be sealed tightly to the frame to help reduce infiltration.
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Install tight-fitting, insulating window shades on windows that feel drafty after weatherizing.
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Close your curtains and shades at night; open them during the day.
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Keep windows on the south side of your house clean to let in the winter sun.
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Install exterior or interior storm windows; storm windows can reduce heat loss through the windows by 25% to 50%. Storm windows should have weather stripping at all moveable joints; be made of strong, durable materials; and have interlocking or overlapping joints. Low-e storm windows save even more energy.
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Repair and weatherize your current storm windows, if necessary.
- Install white window shades, drapes, or blinds to reflect heat away from the house.
- Close curtains on south- and west-facing windows during the day.
- Install awnings on south- and west-facing windows.
- Apply sun-control or other reflective films on south-facing windows to reduce solar gain.
- $ Long-Term Savings Tip: Installing new, high-performance windows will improve your home's energy performance. While it may take many years for new windows to pay off in energy savings, the benefits of added comfort and improved aesthetics and functionality may make the investment worth it to you. Today, many new window technologies are available that are worth considering. Glazing materials (the glass part of the window) 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.
- Look for the ENERGY STAR.
- When you're shopping for new windows, look for the National Fenestration Rating Council 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 a 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 co-efficiency (SHGC) to maximize energy benefits.
- Remember that new windows must be installed correctly to avoid air leaks around the frame. Look for a reputable, qualified installer.
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