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Solar Heat Gain Coefficient (SHGC) or Shading Coefficient (SC)

These are indicators of total solar heat gain. SHGC, which is replacing SC, from is the ratio of total transmitted from is the ratio of total transmitted solar heat to incident solar energy, typically ranging from 0.9 to 0.1, where lower values indicate lower solar gain. These indices are dimensionless numbers between 0 and 1 that indicate the total heat transfer of the sun’s radiation.

SC is the ratio of solar gain of a particular glazing as compared to a benchmark glazing (1/8″ or 3 mm clear glass) under identical conditions. These properties are widely used in cooling load calculations. To convert between these properties, SC = 1.15 x SHGC.