Energy Efficiency and Renewable Energy – U.S. Department of Energy: http://www.eere.energy.gov/

National Renewable Energy Laboratory (NREL): http://www.nrel.gov/

National Fuel Cell Education Program by Eco Soul: http://www.ecosoul.org/main_ecosoul.html

Home Power Magazine: Solar | Wind | Water | Design | Build: http://www.homepower.com/home/

The Association of Energy Engineers: http://www.aeecenter.org/

Technology and the Environment: http://www.technologystudent.com/energy1/engex.htm

Energy Information Administration: http://www.eia.doe.gov/

Energy Star. http://www.energystar.gov/

U.S. Department of Energy. http://www.energy.gov/

U.S. Environmental Protection Agency. http://www.epa.gov/

Home Heating Systems: http://www.heatinghelp.com/

Home Energy Saver: Glossary of Energy Terminology: http://hes.lbl.gov/hes/glossary_dat.html

Insulation Fact Sheet: http://www.ornl.gov/sci/roofs+walls/insulation/ins_01.html