Homeowners can make energy-conscious purchases that will provide tax benefits when filling out ther tax returns for 2009. The NEW law provides tax credits for making your principal residence more energy efficient and for buying certain energy efficient items. The new law increases the energy tax credit to 30% of the cost of all qualifying energy-effieient improvements to existing homes. It also raises the maximum credit limit to $l,500 for improvements placed in service in 2009 and 2010. These improvements include adding insulation, energy efficient exterior windows, energy-efficient heating, air conditioning systems and more. When filing your taxes asking your tax professional what you can deduct.