Whats the NFRC?
The National Fenestration Rating Council is a nonprofit organization that rates windows, skylights, and doors in terms of energy efficiency. The NFRC label on a window or door product provides you with all the information you need to know about the energy performance of a product by giving numerical ratings to the U-Factor, Solar Heat Gain Coefficient, Visible Transmittance, and Air Leakage. These ratings tell you how well a window or door conserves energy and saves you on heating and cooling bills..
