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The NFRC has developed a window energy rating system based on whole product performance.
Solar Heat Gain Coefficient (SHGC) measures how well a product blocks heat caused by sunlight.
The solar heat gain coefficient (SHGC) for your window may be found on the National Fenestration Rating Council (NFRC) label affixed by the window manufacturer prior to sale.
The terms "fenestration", "window", and "glazing" are often used interchangeably. However, window actually describes a system of several components. Window is the term given to an entire assembly comp...
Solar Heat Gain Coefficient (SHGC) measures how well a product blocks heat caused by sunlight.
U-factor measures how well a product prevents heat from escaping.
The basic principles presented on our pages titled "About Solar Gain," "Choosing Windows," and "Q A on Florida Residential Window Replacement" apply to windows with applied plastic window films as we...
This article is based on questions regarding Windows asked during the May REScheck Webcast as well as questions received through email.
Windows typically have a higher U-factor than the rest of the building envelope so structures with high glazing areas are less likely to comply with the energy code.