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NFRC (National Fenestration Rating Council) is an independent, nonprofit organization that provides ratings on energy-efficient windows, doors, and skylights. They provide accurate and credible information on the performance of these products.

The NFRC conducts a series of tests and evaluations to determine the various performance parameters of each fenestration product. This information is then used to calculate the energy efficiency ratings for the products. The energy efficiency ratings are based on several factors, such as the heat gain coefficient and the U-factor of the product.

The heat gain coefficient (SHGC) is a measure of how much solar heat is transmitted through a window. It ranges from 0 to 1 and is affected by the type of glass used in the window. The lower the SHGC, the less solar heat is transmitted through the window, resulting in lower cooling costs.

The U-factor measures the thermal conductivity of the window. The lower the U-factor, the better the insulation properties of the window, resulting in lower heating costs. The NFRC also provides ratings for air leakage, visible transmittance, and condensation resistance.

The ratings provided by the NFRC are useful in helping homeowners and businesses make informed decisions about the fenestration products they purchase. The ratings can be found on a product's label and can also be accessed through the NFRC's online directory.

The NFRC's ratings also provide a standard for manufacturers to measure the energy efficiency of their products. By adhering to these standards, manufacturers can ensure that their products meet the needs of consumers who are looking for energy-efficient products.

In addition to providing ratings for fenestration products, the NFRC also provides education and training for industry professionals. They offer training on how to properly install and maintain products to achieve optimal energy efficiency.

Overall, the NFRC plays a vital role in helping consumers and manufacturers make energy-efficient choices in fenestration products. The organization's ratings provide accurate and credible information that helps consumers make informed decisions, while also providing manufacturers with a standard to strive for in their product development.