First Known Use: 1949
Dictionary
U–value
noun U–val·ue \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
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Origin of U-VALUE
unit
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