Who Determines the Replacement Window Ratings?
The National Fenestration Rating Council (NFRC) is an organization created by the companies within the window, door and skylight community. The council relies on input from suppliers, builders, architects, manufacturers, government agencies, and many other entities to help in the window ratings creation process. The replacement window ratings system developed by the NFRC is based on total product performance. Every window that is certified to the NFRC standards will include an NFRC label on the product. This label provides the only certain way to determine a window’s energy properties and make product comparisons between windows. The NFRC label will also be found on all products which are part of the ENERGY STAR program. There are four primary replacement window ratings that the NFRC uses to determine the window performance, U-factor, Solar Heat Gain Coefficient, Visible Light Transmittance, and Air Leakage. In the near future a fifth window rating will be included: Condensation Resist
