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Our single greatest challenge in energy code enforcement is verification of the thermal performance of windows and doors. The NFRC provides a solution to the challenge. The NFRC is a non-profit organization that administers the only uniform, independent rating and labeling system for the energy performance of windows, doors, skylights, and attachment products. Their goal is to provide fair, accurate, and reliable energy performance ratings for architects, builders, code officials, homeowners and manufacturers.