Energy Efficiency and Renewable Energy Website
U.S. Department of Energy website with extensive links to publications, other websites.

Home Energy Saver
Interactive government website that allows you to specify a residence, then calculates energy and financial performance of energy design elements that you specify.

NC Solar Center
The NC Solar Center has information and factsheets on many issues related to solar energy in N.C. – including the N.C. Renewable Energy Tax Credits.

NC Sustainable Energy Association
This is a renewable energy membership organization that has both practical and policy information about renewable energy technologies in North Carolina.

Energy Star
A federal government website that describes energy-efficient products and maintains lists of "energy star"-rated products.

Oak Ridge National Lab Building Technology Center
This is a building technology site with publications/factsheets, links.

Southface Energy Institute
Nonprofit organization that has factsheets on many issues related to residential energy efficiency and building science.