It is the comparison of the total solar energy transmittance with 3 mm colourless glass. Lower shading coefficient means better solar control. This coefficient is the ratio of the solar heat gain coefficient of the window for which the window is given to the solar heat gain coefficient of a standard reference window with a single-leaf 3 mm transparent glass receiving radiation in the same environmental conditions and in the same way. If this value is greater than 1, it is taken into consideration in increasing solar gain and if it is smaller, it is taken into consideration in reducing solar gain and therefore in solar control. We can find the SHGC value by multiplying the SC value by 0.87.
