We are a Certified Green Professional Call Us for a Free Consultation! Tax credits for energy-efficient home improvements such as windows, doors, skylights, insulation, roofing and HVAC have been increased. To qualify for the tax credit, windows (and doors and skylights) must have a U-factor and solar heat gain cient (SHGC) less than or equal to 0.30. Click Here for More Information. Energy Tax Credit Replacement Windows Designing, Remodeling, Building & Educating for the way you live Christine Fortenberry PO Box 70  ~  Powder Springs, GA 30127 TEL: 770-222-3215  ~  FAX: 770-222-3239  ~  christine@FCSatlanta.com © 2009 Fortenberry Construction Services, LLC. All Rights Reserved.