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A marketing designation developed by the Department of Energy (DOE) and the Environmental Protection Agency (EPA). A product with the ENERGY STAR® label must meet certain energy-performance criteria. The ENERGY STAR® label is the simplest and fastest way for a consumer to ensure product performance for their region of the country. Since the energy performance of windows, doors, TDD's and skylights varies by climate, products are labeled for all US climate zones. Skylights and TDD's receive a different rating than windows and doors. Most VELUX® standard skylights meet the ENERGY STAR® requirements for all US climate zones.

National Fenestration Rating Council (NFRC) is a non-profit, public/private organization created by the window, door and skylight industry. It is comprised of manufacturers, suppliers, builders, architects and designers, specifiers, code officials, utilities and government agencies. NFRC provides consistent ratings on window, door and skylight products.

NFRC's primary goal is to provide accurate information to measure and compare the energy performance of window, door, or skylight products.

GPL, GGL, GDL products are manufactured in Europe and are not NFRC certified.