Instead of attaching the series of 9 incredible guides that the Rocky Mountain Institute has created to help people like us improve energy efficiency in their homes, I'm linking directly to their awesome website here.

To get the PDFs, you'll have to sign in with the Rocky Mountain Institute - so they can see who's using their stuff, but they are all free. The different guides are:

Building Envelopes

Lighting

Space Cooling

Space Heating

Water Heating

Cleaning Appliances

Electronics

Kitchen Appliances

Whole Systems Design