Warmair.com Information on heating system operation, components, troubleshooting and maintenance.
HeatingHelp.com Find answers to steam heating problems by posting questions for experts or reading excerpts from books about heating.
Air Conditioning for Home Owners Interactive manual includes basic troubleshooting and maintenance tips for do-it-yourselfers. Feedback form provided for technical questions.
Honeywell Devices include thermostats, humidistats, air cleaners and humidifiers. Everything from manuals to troubleshooting guides to programming instructions to product support.
HVAC Glossary Consumer guide to the array of efficiency ratings, abbreviations and acronyms used to describe or explain the products.
Carbon Monoxide Poisoning EPA site provides advice on CO detectors, poisoning symptoms and prevention.
Heat Pipes Fact sheet illustrates the theory and operation. Add-on device for air conditioner to improve de-humidification.
Home Ideas Order form to request free literature on new units and related products.
The Boiler Room Forum to post residential steam related questions.
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.
Howstuffworks.com Article that describes air conditioning operation from window units up to large industrial applications.
Space Conditioning Systems Instructions on maintenance procedures for heating systems. Includes drawings and diagrams.
Homestore.com: Heating How-To Articles Wide assortment of tips including programmable thermostats, cleaning air ducts, reducing moisture problems, and basic maintenance.
John Mills Work Page Advice from a service manager on buying a new unit, illustrated essay on chimney liners, and a history of brand names.
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.
HVAC Mechanic Information and support on heating, ventilation and air conditioning systems or controls for home owners and professionals. Knowledge base, recalls, forum, glossary, and events.
RCD Mastics How to locate, repair, and seal ductwork.
Recalls Searchable database provided by Consumer Product Safety Commission.
National Refrigerants Technical support and regulatory updates; articles, faq, and news.
