Glass U-values – what are they?
Best Local Painting inspection contractors - Pro Forum Service Pages - The glazing on the glass has its own U-value. For controlling energy consumption, it’s important to control heat transfer. Materials with very different U-values that are used to make a unit like a window can reduce the unit’s overall ability to stop the transfer of heat. The more similar the U-value of a unit’s components, the more similar the U-value of the finished product will be. The lower the U-value, the better the material will resist heat transfer. . U-values describe heat transfer – whether heat is moving into or out of a building. With regard to windows, all components of the window have a U-value. That means window glass has a U-value, but so does the window frame. Glass has a low R-value, so by definition, it has a high U-value
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