Imperialism 2 for windows 89/23/2023 ![]() Solar Heat Gain Coefficient: the amount of solar radiation which enters the house through radiation. The higher the number the better the glass. ![]() R-Value: the amount of heat retained by the window. The lower the number the better the glass. U Value: the total heat transfer out of a window (Btu/hr-sq ft-F or W/sq m- C). All C.O.G U- and R-values are based on ASHREA Winter Conditions. Framing, cladding, frame type and other items will affect the overall thermal values of a complete window. (centre of glass) ratings are based on Vision v4.0 simulations. Dual pane, one Low-E & one SunStop coating, Argon
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