What is R-Value and U-Value?
Window efficiency and insulation is always given in terms of a U-value or an R-value. These values quantify the rate of heat loss allowing the consumer to understand the insulation value of the product. Glass types, sizes, glazings, frame materials and installation affect these values. The U-Value is simply the inverse of the R-value, so as a standard rule of thumb a window with a higher r-value and lower u-value is considered more energy efficient. If the R-value is high, there is less heat loss and similarly if the U-value is low, there is also less heat loss. Standard R-values range from 1.0 to 5.0 while U-values range from 1.0 to 0.2. A single pane of glass has very little insulating value and its R-value is about R-1. These standards are set by the American Society of Heating, Refrigeration and Air-Conditioning Engineers. The U.S.
Window efficiency and insulation is always given in terms of a U-value or an R-value. These values quantify the rate of heat loss allowing the consumer to understand the insulation value of the product. Glass types, sizes, glazings, frame materials and installation affect these values. The U-Value is simply the inverse of the R-value, so as a standard rule of thumb a window with a higher r-value and lower u-value is considered more energy efficient. If the R-value is high, there is less heat loss and similarly if the U-value is low, there is also less heat loss. Standard R-values range from 1.0 to 5.0 while U-values range from 1.0 to 0.2. A single pane of glass has very little insulating value and its R-value is about R-1. These standards are set by the American Society of Heating, Refrigeration and Air-Conditioning Engineers. The U.S. Department of Energy’s Windows and Glazings Program in collaboration with members of the Efficient Window Collaborative (EWC) have made a commitment tow
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