U-value

U-value
  or U-factor
  A measure of how well heat is transferred by the entire window - the frame, sash and glass - either into or out of the building. U-value is the opposite of R-value. The lower the U-factor number, the better the window will keep heat inside a home on a cold day.
  California Energy Comission. Dictionary of Energy Terms

Energy terms . 2014.

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