This is your best Home Improvement Energy saving tip for 2006.
If you really want to save a substansual amount of money on your monthly utility bills then this is the only thing you need to do, add more insulation to your attic either in the form of roll insulation or blown in insulation. Nothing will pay you more than adding insulation to your attic. It will pay you back from 20% to 35% in savings this year alone on your heating and cooling bills. TIP-- also you may be able to deduct the improvement from your federal taxes.