See also:

• Business: Construction and Maintenance: Materials and Supplies: Mechanical: Heating, Ventilating, and Air Conditioning  (403)
• Home: Consumer Information: Appliances: Heating  (23)
• Shopping: Home and Garden: Climate Control: Air Conditioning  (31)

• 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.
• Consumersearch.com: Air Conditioners - The site identifies which products reviewers like and dislike, where they agree or disagree, and why.
• eBuyingGuides: Window Air Conditioning - How to buy a room air conditioner.
• Epinions: Air Conditioners - Consumer reviews, price information, related appliances, buying tips and advice, ratings.
• 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.
• HowStuffWorks: Air Conditioners - Describes air conditioning from window units up to large industrial applications.
• 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.
• Refrigerant-22 Phaseout - EPA site with homeowner information for consideration when purchasing or repairing a residential system or heat pump.
• SoYouWannaBuy.com: Air Conditioner - Step-by-step instructions on how to buy an air conditioner.
• Warmair.com: Cooling Topics and Tools - Includes information on all aspects and variations of cooling, air conditioning, including consumer information on how these appliances work and what to look for.