What Makes a Window Energy Efficient?
Numerous factors, including how the frame and ashes are engineered and built, the type of class used (single-, double- or triple-pane), the weather-stripping, the type of low-emissivity coating on the glass and the presence of argon or krypton gas.

What Is Energy Star?
ENERGY STAR is a U.S. government program—administered by the Department of Energy and the Environmental Protection Agency with the cooperation of manufacturers—that’s designed to reduce the consumption of fossil fuels through the education of consumers. The program covers many different types of products. Windows and doors can only carry the ENERGY STAR label if they are tested by an independent laboratory through the NFRC program and meet specific, predetermined U-value ratings. By selecting ENERGY STAR products, you will reduce your energy costs and help make the environment cleaner.

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