Can I get a tax break for putting energy-efficient windows in my home? Yes, a limited credit is available if you install them by Dec. 31. The tax law extended through 2016 the credit for energy-saving items such as windows, insulation, roofs and doors. It stays at 10% with a $500 maxiumum. Any credits taken in prior years count against the $500. Many items are capped: no more than $50 for circulating fans, $150 for furnaces, and $200 for windows.