Save money on heating and cooling bills and save on your 2009 taxes by making energy efficient improvements to your house. EnergyStar.gov has got the lowdown on how you can get tax credits by installing new windows, doors, roofs, insulation, HVAC, and non-solar water heaters. Unfortunately, upgrades made during 2008 are not eligible, but with this info you can get going for this year. For a breakdown of all the tax credits, Consumer Reports Home & Garden blog has a good post.