U Values for Windows

By |2012-09-24T12:45:23-05:00September 24th, 2012|Blog|

What is the U-factor? The U-factor, or U-value, is the measure of a window’s thermal efficiency, based on its resistance to the flow of energy. The lower the U-factor, the more thermally efficient the window. Most new window technology has been aimed at lowering U-factors through the use of three important innovations: warm-edge seals, low [...]