To reach tax credit levels both the U-Factor and the SHGC must be equal to or less than .30. Each window you buy should have an energy-performance label on it supplied by the National Fenestration Rating Council (NFRC). This is the only rating council recognized by the federal government when issuing tax credits. You can check out energystar.gov for more information on qualifying windows and how you can go about getting your credit.
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