What is the Solar Heat Gain Coefficient on Replacement Windows ?
Posted by James Desmond on Tue, Apr 20, 2010 @ 02:18 PM
The Solar Heat Gain Coefficient indicates how well the product blocks solar radiation from the sun. The lower the SHGC, the less solar heat it transmits. The ENERGY STAR program has established specific criteria for replacement windows and doors for three climate zones in the US. It is recommended that you contact the manufacturer to ensure that the product is ENERGY STAR certified and that you check the U-value and SHGC numbers. To be eligible for ENERGY STAR certification, products must be rated, certified, and labeled for both U-value and SHGC in accordance with the procedures of the National Fenestration Rating Council (NFRC) at levels that meet the ENERGY STAR qualification criteria in one or more climate zones. 
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