May 5, 2022

What type of window is the most energy-efficient?

What type of window is the most energy-efficient? How to read U-values and R-values to tell. Window energy efficiency is measured by two metrics: U-value and R-value. Both values are indicators of window performance, and for windows to be as energy-efficient as possible, you’ll want to pay attention to both of these numbers.  U-value measures heat …

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