U-value
U–val·ue
noun \ˈyü-ˌval-(ˌ)yü\Definition of U-VALUE
: a measure of the heat transmission through a building part (as a wall or window) or a given thickness of a material (as insulation) with lower numbers indicating better insulating properties — compare r-value
Origin of U-VALUE
unit
First Known Use: 1949
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