As a proud ENERGY STAR partner, we ensure our products are rated, certified and labeled for U-Value and Solar Heat Gain by the National Fenestration Rating Council (NFRC).
The ENERGY STAR label, first introduced by the Environmental Protection Agency in 1992, has grown to identify efficient products in more than 35 categories.
The ENERGY STAR criteria for residential windows and doors are tailored to four Climate Zones. A product's energy efficiency for a given climate is based on its impact on heat gain and loss in cold weather and heat gain in warm weather.
ENERGY STAR link: (www.energystar.gov)
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