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A · B · C · D · E · F · G · H · I · J · K · L · M · N · O · P · Q · R · S · T · U · V · W · X · Y · Z   entire Web this site coefficient of heat transmission (U-value) A value that describes the ability of a material to conduct heat. The number of BTU that flow through one square foot of material in one hour. It is the reciprocal of the R-value (i.e. U-value = 1/R-value). The lower the number, the greater the heat transfer resistance (insulating) characteristics of the material. Related category    • INSULATION TOPICS Also on this site: Encyclopedia of Science Transport Concepts & Designs (partner site) BACK TO TOP