President Obama signed a stimulus bill (The American Recovery and Reinvestment Act of 2009) on February 17, 2009 which allows consumers to receive a tax credit on their window replacement. The tax credit is 30% of cost, up to $1500.00. Our window products meet and exceed the U-Factor and SHGC criteria of 0.30 and under with Argon Gas. For more information log onto: www.energystar.gov