Spend up to $1,500 making your primary residence more energy efficient, and get 30 percent back on approved products. This includes stoves, air conditioners, insulation, roofing supplies and more. The credit is good through Dec. 31, 2010. Other specialized credits extend through 2016.
Get all the scoop here:
https://www.energystar.gov/index.cfm?c=tax_credits.tx_index