There is a federal tax credit for improving your home with energy efficient appliances or improving the overall efficiency of your home. So, need new windows? Replace them and get money back on your taxes. Want to insulate your house? Do it! Get some money back! But like anything from the government, there are time limits and catches.
The below website is an amazing comprehensive guide to what constitutes as energy efficient, how much can you get back, and how long you have till the tax credit runs out.
So you now you can shop for green and get some greenbacks!