Understanding
Windows

Energy-efficient windows go beyond just being a frame with glass. These windows contain cutting-edge technologies that are seamlessly integrated into their design. By familiarizing yourself with the different types of energy-efficient windows and the options available, you can add long-lasting value to your home in just a matter of minutes.

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About Us

provides unbiased information and education to the public on the energy efficiency, technical, and human considerations that influence window selection and use. The EWC collaborates with allied organizations, educational institutions, and government agencies that promote energy efficiency in residential windows. We do not sell, service, install, or recommend products, or endorse manufacturers. Descriptions and specifications of the products in the Window Selection Tool are provided by the manufacturer. The EWC is not liable for any manufacturing defects or inaccurate product descriptions and specifications and does not guarantee the performance of NFRC-certified windows, doors, and skylights.

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ewc@nfrc.org
National Fenestration Rating Council
6305 Ivy Lane, Suite 410
Greenbelt, MD 20770
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