R-value and U-factor differ in that U-factor measures:
Correct Answer
B) The rate of heat transfer, where lower is better (n)
U-factor measures thermal transmittance; lower means less heat flow. R measures resistance. U=1/R applies to the same assembly and compatible units. Reflectivity is not SHGC, which concerns solar heat gain; neither is vapor permeability. Source: https://www.energy.gov/cmei/femp/purchasing-energy-efficient-residential-windows-doors-and-skylights
Why This Is the Correct Answer
U-factor measures thermal transmittance; lower means less heat flow. R measures resistance. U=1/R applies to the same assembly and compatible units. Reflectivity is not SHGC, which concerns solar heat gain; neither is vapor permeability. Source: https://www.energy.gov/cmei/femp/purchasing-energy-efficient-residential-windows-doors-and-skylights
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