For U-value we have terms and definitions in 4 topics. The topics are Green Energy, Real Estate, Roofing and Windows.

U-value (Green Energy)

Measure of thermal transmission for a window assembly.

U-value (Real Estate)

A measure used to indicate the insulating value of a window. The U-value measures the heat flow. The smaller the U-value, the better a material can stop heat flow.

U-value (Roofing)

A measure of air-to-heat transmission (loss or gain) due to the thermal conductance and the difference in indoor and outdoor temperatures. As the U-value decreases, so does the amount of heat that is transferred through the glazing material. The lower the U-value, the more restrictive the fenestration product is to heat transfer. Reciprocal of R-value.

U-value (Windows)

U-value, or U-factor, measures how much heat the window conducts. It's the converse of R-value - the lower the U-value the better. U-values can range from 1.1 to 0.3; a rating of 0.4 is considered high-efficiency.

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