Definitions: U - Windows and exterior doors


Similar - thermal transmittance

A U-value is the overall heat transfer coefficient for an exterior facing component such as an exterior wall assembly, door, or window. The higher the U-value, the larger the amount of heat is transferred or lost through the object, for a given indoor and outdoor temperature.

References - U-value

See the following for additional U-value information:

Service Professionals that can help with U-value issues

Common projects involving U-value

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