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Energy Code Lookup

Windows that meet code, wherever you build

Enter a project ZIP to see its IECC climate zone and the U-factor and SHGC caps that apply. We check every Alumen system against those caps and recommend the right glass package for each.

Or pick a climate zone

Caps shown are the active IECC edition's prescriptive fenestration values alongside ENERGY STAR 7.0 targets; local amendments may differ — confirm with your building department. Performance figures are representative NFRC ratings per product and glass package.