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Keywords: article_keywords:(U-factor, NFRC label, SHGC, heating degree days) article_title:(U-factor, NFRC label, SHGC, heating degree days)^4

This article is based on questions regarding Windows asked during the May REScheck Webcast as well as questions received through email.

U-factor measures how well a product prevents heat from escaping.

Solar Heat Gain Coefficient (SHGC) measures how well a product blocks heat caused by sunlight.

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.

It is common for mechanical systems in residential construction to be oversized which increases installation costs, wastes energy, and reduces comfort and moisture control. Properly sized equipment wi...

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.

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.