This fact sheet contains the most recent information on federal energy efficiency tax incentives for 2010 and 2011. These include tax incentives for new homes builders, appliance manufacturers, and consumer credits for heating and cooling equipment and building envelope improvements. The tax incentives have been extended in many cases for 2011, but some eligibility requirements have changed.
For more information, check out the Tax Incentives Assistance Project at http://energytaxincentives.org/.