If you are considering puurchasing an energy-efficient product or renewable energy system for your home, you may be eligible for a federal tax credit. This link    http://www.energystar.gov/index.cfm?c=tax_credits.tx_index                                                              will provide an overview of the federal tax credits for energy efficiency. 

Energy efficiency includes the following categories.  Be sure to access the links provided.

Key in the article are the following line items that are included in the tax credit:

Tax Credit: 30% of cost up to $1,500

Expires: December 31, 2010

Details: Must be an existing home & your principal residence. New construction and rentals do not qualify.

Biomass Stoves
Heat, Ventilating, Air Conditioning – HVAC
Insulation
Roofs
Water Heaters
Window & Doors

Tax Credit:  30% of cost with no upper limit

Expires:  December 31, 2016

Details:  Existing homes & new construction qualify. Both principal residences and second homes qualify. Rentals do not qualify.

Geothermal Heat Pumps
Small Wind Turbines (Residential)
Solar Energy Systems