featured Aluminum Window U-Factor Targets by Climate: A Designer's Reference
Why U-Factor Is the Most Critical Metric for Aluminum Window Specification When architects, builders, and contractors specify windows for a new construction or retrofit project, no single performance number carries more regulatory and energy consequence than U-factor. Unlike visible light transmittance or air leakage ratings, U-factor directly determines whether your fenestration assembly passes prescriptive energy code—or triggers a costly performance-path compliance review....
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