Installation of certain products or equipment in a principal residence can qualify for a tax credit equal to 30% of cost, with the maximum credit capped at $1,500. The products or equipment, must be installed by December 31, 2011 and include energy-efficient:
• Exterior doors
• Windows
• Insulation
• Heating and/or cooling systems
• Heat-resistant roofs
Home Renewable Energy Sources
Installing renewable energy systems – in either a principal or second home – can qualify for a tax credit equal to 30% of costs with no maximum cap. Consumers have until December 31, 2016 to install:
• Solar water heating and/or solar electric power
• Small wind systems
• Geothermal heat pumps
• Microturbine systems
EnergyStar.gov's Federal Tax Credits for Energy Efficiency has complete details for both programs. See also the Database of State Incentives for Renewables and Efficiency (DSIRE) for information on federal, state, local, and utility incentives.