Solar Heat Gain Coefficient

Abbreviation: SHGC

Quantifies the amount of solar radiation through the window [1].  The SHGC number ranges between 0 and 1, and represents the fraction of solar heat transmitted through the window, as compared to the amount of heat that would flow through a comparable unobstructed opening of the same size [2].


  1. National Trust for Historic Preservation, Preservation Green Lab, Cascadia Green Building Council, Ecotope, and National Centre for Preservation Technology and Training. “Saving Windows Saving Money,” 2012. Windows Saving Money.
  2. Kinney, Larry, and Amy Ellsworth. “The Effects of Energy Efficiency Treatment on Historic Windows,” January 24, 2011.


WP Glossary Term Usage

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