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**U-Factor**- the u-factor is the coefficient of air-to-air heat transmission through a building envelope assembly. It is equal to the rate of heat flow per unit area and unit temperature difference between the warm side and cold side air films. Lower U-Factors act as better insulators, see [[insulation]].

Its units are //BTU's per hour per square foot per degree Fahrenheit temperature difference// (Btu/hr*sqft*°F)

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