The Solar Heat Gain Coefficient (SHGC) is the measurement of how well a window blocks heat from sunlight. The SHGC is the fraction of the heat from the sun that enters through a window. SHGC is expressed as a number between 0 and 1. The lower a window''s SHGC, the less solar heat it transmits.

The value can act as a part of compliance documentation for meeting the requirement of SHGC