Overview of R Factor Windows
U-Factor and R-Value impact the performance of the windows . Here's the difference between the two ratings and why it matters for window insulation.
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Key Details About R Factor Windows

Visit Vinyltek's showrooms to see NFRC labels on actual windows and discuss what the ratings mean for your specific situation. Our team explains performance numbers honestly and helps you choose windows that deliver real value. Contact our experts with questions about U-factors, R-values, or any other aspect of window performance.

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What is window R-value? See charts for single, double & triple panes, compare U-value, learn what's a good R-value, and discover the highest R-value windows & doors.
Window Energy Rating Guide
More Context About R Factor Windows
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