American Recovery and Reinvestment Act (ARRA)
"(The) ARRA provides for a uniform credit of 30 percent of the cost of qualifying improvements up to $1,500, such as adding insulation, energy-efficient exterior windows, and energy-efficient heating and air conditioning systems. The new law replaces the old law combination available in 2007 of a 10-percent credit for certain property and a credit equal to cost up to a specified amount for other property."
This Link gives a breakdown of all the credits for 2009 & 2010.
If you want to read the full IRS text (click here)
Make sure it says "Energy Star", you don't have to bring to the tax appointment, but you do have to keep them for your records.