LINKS

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A.R.I. Institute     Look up the Seasonal Energy Efficiency Rating of your air conditioner
G.A.M.A.  Gas Appliance Manufacturers Association.  Look up the efficiency of your gas appliance.
A.S.H.R.A.E.  American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. . Information about technical  products and issues.  
E.P.A.   Environmental Protection Administration ;This website gives in depth information about the Clean Air act and Freon and Ozone rules amongst  others.
Better Business Bureau    Check companies with whom you do business
US Department of Energy Some good tips on how to save energy; lots of good information.
The White House Web Site Also has good information on energy usage and policies.
http://www.energy.gov/taxbreaks.htm  some good information on tax credits for new heating and cooling equipment.

http://www.energystar.gov/index.cfm?c=heat_cool.pr_hvac   Calculate savings when you upgrade your heating and cooling systems, good tips on maintaining your heating and cooling equipment.
http://www.energystar.gov/index.cfm?c=tax_credits.tx_index Also Some Good Tax SavingTips from Energy Star !