Mother Earth Living

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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