Energy Expert links Heat System Cost Calculator (compare existing with new) http://www.energyexperts.org/fuelcalc/ Cooking System Cost Calculator (comparison tool) http://www.energyexperts.org/ac_calc/default.asp US DOE Office of Energy Efficiency & Renewable Energy Consumer's Guide to Energy Efficiency and Renewable Energy http://www.eere.energy.gov/consumer/ US EPA/DOE Energy Star http://www.energystar.gov/ Western Area Power Administration Energy Services, Energy Fact Sheets http://www.wapa.gov/es/pubs/fctsheet/default.htm Western's Holiday Lighting Fact Sheet http://www.wapa.gov/es/pubs/fctsheet/HolidayLites08branded.pdf Energy Star, Decorative Light Strings http://www.energystar.gov/index.cfm?c=dls.pr_dls http://www.energystar.gov/index.dfm?c=dls.pr_dls_brands (qualified brands) http://www.energyideas.org http://www.moneynowusa.com/v1/articles/saving-energy-to-save-money.php http://nicorhomeservices.com/info/nicor-home-services-energy-efficiency-guidebook-for-kids