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ClimaGuard Performance Table

ENERGY STAR® prescribes a set of NFRC-certified U-Factor and solar heat gain coefficient (SHGC) rating levels for windows that meet its performance criteria across climate zones. Guardian Glass center-of-glass performance is calculated in accordance with NFRC-100, assuming a 3mm glass thickness for dual-pane units with an IS 20 interior surface coating, and a 2.3mm glass thickness for triple-pane units with argon fill.