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Tomorrow's Energy Star Window

The Department of Energy revised its criteria for Energy Star windows, doors and skylights, raising its efficiency standards for 2010.
By Susan Melgren
November/December 2009
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Southwall Technologies Heat Mirror glass offers R-20 insulation.
Photo Courtesy Stanek Windows

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The Department of Energy revised its criteria for Energy Star windows, doors and skylights, raising its efficiency standards for 2010. For windows and skylights, the U-factor (which indicates how well a product prevents heat from escaping) and the Solar Heat Gain Coefficient (SHGC) criteria (which indicates how well a product blocks heat from entering) have been tightened. The DOE is expected to require Insulating Glass (IG) certification for Energy Star-qualified doors, windows and skylights by next July.

In addition, the Climate Zone map has changed. To see if your area is affected, go to Energy Star's website.

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