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. eBuyingGuides: Window Air Conditioning - How to buy a room 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. Epinions: Air Conditioners - Consumer reviews, price information, related appliances, buying tips and advice, ratings. Consumersearch.com: Air Conditioners - The site identifies which products reviewers like and dislike, where they agree or disagree, and why.