- Central Air Conditioner and Refrigeration
- Offers information on how central air conditioners works, air conditioner history, refrigeration cycle and other step by step guides.
- The Home Improvement Centre: Air Conditioning
- Provides information about purchasing an air conditioner, different types of air conditioning systems, costs and manufacturers, and how air conditioners work.
- Howstuffworks: Air Conditioners
- Informative presentation covering air-conditioning basics, systems, units, operation, and household use.
- HVAC Mechanic
- Collection of free answers to questions and problems related to furnace, heating, heat pumps, and air conditioning.
- SoYouWanna Buy an Air Conditioner?
- Consumers' guide to choosing an AC unit to buy. Presents tips and related links and resources.
- Superior Air
- Provides consumer information related to buying or contracting an installer of heating and air conditioning units.
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