If you purchase an energy-efficient product or renewable energy system for your home, you may be eligible for a federal tax credit. Below you will find an overview of the federal tax credits for energy efficiency.
Please note, not all ENERGY STAR qualified products qualify for a tax credit. ENERGY STAR distinguishes energy efficient products which, although they may cost more to purchase than standard models, will pay you back in lower energy bills within a reasonable amount of time, without a tax credit.
More information http://www.energystar.gov/index.cfm?c=tax_credits.tx_index