From the Energy Star web site:
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 in your home by using ENERGY STAR certified products. Products that have earned the ENERGY STAR are independently certified to save energy, save money and protect the environment. Use up to 30% less energy in your home by outfitting with ENERGY STAR certified products available across more than 70 categories.
*Disclaimer: The tax credit information contained within this website is provided for informational purposes only and is not intended to substitute for expert advice from a professional tax/financial planner or the Internal Revenue Service (IRS).
We encourage people to check the EnergyStar web site for updates. Tax credits are not available for EnergyStar appliances or CFL light bulbs. However, although not tax credits, EnergyStar Partners sometimes have special offers/rebates. When buying a new appliance, you may want to check the “Rebate Finder” first.
Maine residents! There may be other energy-related incentives available via Efficiency Maine.