Hi trberkovich,
Excellent question. So you want to confirm if the specific window you bought qualifies for the credit? Per the IRS, "Exterior windows and skylights that meet Energy Star Most Efficient certification requirements " will qualify. The U-Factor criteria is dependent on where the home is located. Check this page for the specifics: https://www.energystar.gov/products/residential_windows_doors_and_skylights/key_product_criteria
