

Represents the heat flow rate through a window. It’s expressed in thermal units, using winter weather conditions of -17°C outside and 21°C inside. The smaller the number, the better the window system is at reducing heat loss.
The higher the R-Value, the more efficient the window is in reducing winter heating costs. (This number is the inverse of U-Value.)
The amount of solar radiation that enters a building as heat. The lower the number, the better the glazing is at preventing solar heat gain.
Measures the total amount of heat passing through the glazing (total solar heat transmittance) compared with a single clear glass. The lower a window’s solar heat gain coefficient or shading coefficient, the less solar heat it transmits, and the greater its shading ability.

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