| AC-Pal | | Software allows input of data from instrument readings and gives solution to the problem. Definition and help section provides additional information about concepts and functions. Demonstration version available. |
| Air Conditioning for Home Owners | | Interactive manual includes basic troubleshooting and maintenance tips for do-it-yourselfers. Feedback form provided for technical questions. |
| Air Duct Calculator | | Input a desired flow rate in CFM, a limiting velocity in FPM, air temperature in degrees F, the length of the duct, and the duct material. The program calculates the duct cross sectional area, the circular duct diameter, and rectangular duct equivalents. |
| Allexperts Repair Q and A | | Volunteer mechanics answer questions via e-mail. Volunteers can be evaluated based on credentials and user ratings. |
| Big Blu Manual | | Tutorial illustrating step by step procedures for finding refrigerant leaks. |
| BTU Calculator | | Estimate the heating needs of a room, combination of rooms, or an entire home. |
| Carbon Monoxide Alert | | Comprehensive site includes safe/unsafe practices, effects, detector placement, and discussion. |
| Duct Cleaning | | EPA tips on how to determine if ductwork needs cleaning. Criteria for choosing a contractor. |
| Hannabery HVAC | | Everything from troubleshooting to maintenance and repair. |
| Hearth.com | | Information on gas, wood, pellet, and coal appliances. Cost comparison of the different fuels. |
| Heat Pipes | | Fact sheet illustrates the theory and operation. Add-on device for air conditioner to improve de-humidification. |
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