- 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.
- Allexperts Repair Q and A - Volunteer mechanics answer questions via e-mail. Volunteers can be evaluated based on credentials and user ratings.
- Buried Tanks - Home Heating Oil - Legal, environmental and technical information.
- Carbon Monoxide Protocol - Guidelines to determine whether potential exists for this deadly gas to enter a house.
- Heating System Maintenance - Tips on preparing a furnace for winter operation.
- Duct Cleaning - EPA tips on how to determine if ductwork needs cleaning. Criteria for choosing a contractor.
- Sound Home Resource Center - In-depth articles on topics related to improvement, care, and maintenance.
- Hannabery HVAC - Everything from troubleshooting to maintenance and repair.
- Learn Ductwork - Illustrated tutorial on fabricating sheet metal ductwork.
- Hearth.com - Information on gas, wood, pellet, and coal appliances. Cost comparison of the different fuels.
- Carbon Monoxide Alert - Comprehensive site includes safe/unsafe practices, effects, detector placement, and discussion.
- HVAC-Talk - Software bulletin board for HVAC contractors, home-owners, do-it-yourself enthusiasts to use for heating and air conditioning concerns.
- Aprilaire Owner's Manuals - For humidifiers, air cleaners, thermostats, zone control systems and fresh air exchangers.
- BTU Calculator - Estimate the heating needs of a room, combination of rooms, or an entire home.
- Brazing, Soldering and Welding - Tutorial illustrating step by step procedures.
- RepairNet - Flat rate price guide for checking repair costs.
- Appliance411.com - List of do's and don'ts for maintenance and repair.
- Big Blu Manual - Tutorial illustrating step by step procedures for finding refrigerant leaks.
- Furnace Blower Repair - Short example on replacing bearings and fan belt.
- 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.
- Air Conditioning Information and Diagnosis - Diagnostics chart for troubleshooting. Tips on air filters, refrigerant charging, thermostats, and operation.
- Carbon Monoxide Poisoning - EPA site provides advice on CO detectors, poisoning symptoms and prevention.
- Gas Furnace Alert - Warning about the potential danger if flue pipe is not replaced when a modern high efficiency furnace is installed. (click "alert" to get to page)
- HVAC Help for the Homeowner - Experienced mechanic shows how to get help from the web. Includes advice from other mechanics and numerous searches of alt.hvac where many industry experts have answered a variety of questions.
- 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.
- Radiant Design Institute - Illustrations and detailed tutorials for installation of radiant floor heating.
- 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.
- Ontario Propane Association - Liquid propane gas serviceman's handbook. Installation and inspection instructions.
- 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.
- MSN House and Home: Climate - Overview of systems which contribute to climate within the home - insulation, air conditioners, vents, humidifiers and dehumidifiers, forced air heaters, filters, and thermostats. Illustrations, common problems, and basic repair instructions.
- 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.
- HVAC Stories at Old House Web - Advice geared toward historic or older homes.
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