> R-Value to U-Value Conversion Calculator
This calculator makes it easy to convert between R and U Values. R-value is how well a particular construction material insulates, the higher the better. Whereas the lower the U-Value, the more energy efficient the material is. The U-value is the reciprocal of the R-value; that is U = 1/R and R = 1/U.
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energy efficiency, sustainable development, passive solar, insulation, buildings