What does ENERGY STAR have to do with the National Fenestration Rating Council (NFRC)?
Windows and patio doors qualify for the ENERGY STAR label when they reach certain energy-saving specifications required by the ENERGY STAR program. This qualification is determined by those values listed on the NFRC label. In order to participate in the ENERGY STAR program, manufacturers must have certified NFRC U-factor and solar heat gain coefficient (SHGC) performance values. NFRC also requires a visible transmittance rating on the label. ENERGY STAR qualifying windows and patio doors are tailored to fit the needs of different regions of the country.
