eBuyingGuides: Window Air Conditioning  
   How to buy a room air conditioner.
   http://www.ebuyingguides.com/how/WinAC2_H.htm

Epinions: Air Conditioners  
   Consumer reviews, price information, related appliances, buying tips and advice, ratings.
   http://www.epinions.com/hmgd-Large_Appliances-All-Air_Conditioners

Warmair.com: Cooling Topics and Tools  
   Extensive information on all aspects and variations of cooling, air conditioning, including consumer information on how these appliances work and what to look for.
   http://www.warmair.com/html/cooling.htm

Carrier  
   Brand name product site. In addition to Carrier information, also has pages with consumer information such as what size air conditioners to buy for both home and industrial use.
   http://www.global.carrier.com/

HowStuffWorks: Air Conditioners  
   Describes air conditioning from window units up to large industrial applications.
   http://www.howstuffworks.com/ac.htm

SoYouWannaBuy.com: Air Conditioner  
   Step-by-step instructions on how to buy an air conditioner.
   http://www.soyouwanna.com/site/syws/aircond/aircond.html

Heating and Air Conditioning Buying Tips  
   From a sales site, consumer information on buying heating and air conditioning and on hiring a contractor for installation.
   http://superior-air.com/hvac.htm?buying_tips.htm~mainFrame

ACDoctor.com: Brand Neutral Air Conditioning Information  
   Information on buying and maintaining air conditioning systems.
   http://www.acdoctor.com/air_conditioning/air_conditioning.htm

Refrigerant-22 Phaseout  
   EPA site with homeowner information for consideration when purchasing or repairing a residential system or heat pump.
   http://www.epa.gov/ozone/title6/phaseout/22phaseout.html

Consumersearch.com: Air Conditioners  
   The site identifies which products reviewers like and dislike, where they agree or disagree, and why.
   http://www.consumersearch.com/www/house_and_home/air_conditioners/index.html

HVAC Mechanic.com  
   Information and support on heating, ventilation and air conditioning systems or controls for home owners and professionals. Knowledge base, recalls, forum, glossary, and events.
   http://www.hvacmechanic.com