Tax credits for residential energy efficiency have now expired.  The tax credit for builders of energy efficient homes and tax deductions for energy efficient commercial buildings have also expired.

The tax credits for residential renewable energy products are still available through December 31, 2021. Renewable energy tax credits for fuel cells, small wind turbines, and geothermal heat pumps now feature a gradual step down in the credit value, the same as those for solar energy systems.

While the tax credits for residential energy efficiency have expired, you can still save money and energy

Homeowners can take advantage of energy efficient mortgages (EEM) to either finance energy efficiency improvements to existing homes, including renewable energy technologies, or to increase their home buying power with the purchase of a new energy efficient home. The U.S. federal government supports these loans by insuring them through Federal Housing Authority (FHA) or Veterans Affairs (VA) programs. This allows borrowers who might otherwise be denied loans to pursue energy efficiency, and it secures lenders against loan default.

FHA Energy Efficient Mortgages
The FHA allows lenders to add up