Dictionary.com
definitions
  • synonyms

U-value

[yoo-val-yoo]
noun
  1. a measure of the flow of heat through an insulating or building material: the lower the U-value, the better the insulating ability.
Show More
Compare R-value.

Origin of U-value

1945–50; U, symbol for internal energy
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018