Ask The Expert Answers: energycore windows
What's the Difference between U-factor and R-value in Energy Efficient Windows?
The biggest difference between U-factor and R-value is that U-factor measures the rate of heat transfer (or loss) while R-value measures the resistance to heat loss. R-value is a measure of conductivity.
Tags: energy efficient windows, energycore, energycore windows, heat transfer, r-value, u-value
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