- 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 Exchange
Glossary of heating and cooling terms and online estimating tools including HVAC operating cost analysis, HVAC efficiency finder, equipment size estimator.
- Air Conditioning for Home Owners
Interactive manual includes basic troubleshooting and maintenance tips for do-it-yourselfers. Feedback form provided for technical questions.
- Air Conditioning Information and Diagnosis
Diagnostics chart for troubleshooting. Tips on air filters, refrigerant charging, thermostats, and operation.
- 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.
- Appliance411.com
List of do's and don'ts for maintenance and repair.
- Aprilaire Owner's Manuals
For humidifiers, air cleaners, thermostats, zone control systems and fresh air exchangers.
- Arthur Hewett
Factsheets on purchasing a new system, determining proper size, ductwork, grilles, and a glossary of industry terms.
- Ask Edward
Mechanic answers homeowner's queries on a wide range of service concerns.
- Big Blu Manual
Tutorial illustrating step by step procedures for finding refrigerant leaks.
- Brazing, Soldering and Welding
Tutorial illustrating step by step procedures.
- BTU Calculator
Estimate the heating needs of a room, combination of rooms, or an entire home.
- Buried Tanks - Home Heating Oil
Legal, environmental and technical information.
- Carbon Monoxide Alert
Comprehensive site includes safe/unsafe practices, effects, detector placement, and discussion.
- Carbon Monoxide Poisoning
EPA site provides advice on CO detectors, poisoning symptoms and prevention.
- Carbon Monoxide Protocol
Guidelines to determine whether potential exists for this deadly gas to enter a house.
- Diagnostic Help
For central air conditioning, window units and heat pumps.
- Do It Yourself HVAC
Covers a wide range including information on indoor air quality, safety and thermostats. Provides cost estimate for various repairs.
- Duct Cleaning
EPA tips on how to determine if ductwork needs cleaning. Criteria for choosing a contractor.
- Furnace Blower Repair
Short example on replacing bearings and fan belt.
- 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)
- 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.
- Heating System Maintenance
Tips on preparing a furnace for winter operation.
- HeatingHelp.com
Find answers to steam heating problems by posting questions for experts or reading excerpts from books about heating.
- Home Ideas
Order form to request free literature on new units and related products.
- Homestore.com: Heating How-To Articles
Wide assortment of tips including programmable thermostats, cleaning air ducts, reducing moisture problems, and basic maintenance.
- Honeywell
Devices include thermostats, humidistats, air cleaners and humidifiers. Everything from manuals to troubleshooting guides to programming instructions to product support.
- Howstuffworks.com
Article that describes air conditioning operation from window units up to large industrial applications.
- HVAC Glossary
Consumer guide to the array of efficiency ratings, abbreviations and acronyms used to describe or explain the products.
- 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.
- 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.
- HVAC Stories at Old House Web
Advice geared toward historic or older homes.
- HVAC-Talk
Software bulletin board for HVAC contractors, home-owners, do-it-yourself enthusiasts to use for heating and air conditioning concerns.
- 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.
- Learn Ductwork
Illustrated tutorial on fabricating sheet metal ductwork.
- 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.
- National Refrigerants
Technical support and regulatory updates; articles, faq, and news.
- Novia Heating Oil
Homeowner checklist for oil furnace malfunction.
- Oil Burner Man
Detailed answers on oil heating systems with emphasis on boilers.
- Ontario Propane Association
Liquid propane gas serviceman's handbook. Installation and inspection instructions.
- Pacific Gas and Electric Company
Database of manufacturers and models searchable by user defined specifications.
- Radiant Design Institute
Illustrations and detailed tutorials for installation of radiant floor heating.
- RCD Mastics
How to locate, repair, and seal ductwork.
- Recalls
Searchable database provided by Consumer Product Safety Commission.
- RepairNet
Flat rate price guide for checking repair costs.
- Sound Home Resource Center
In-depth articles on topics related to improvement, care, and maintenance.
- Space Conditioning Systems
Instructions on maintenance procedures for heating systems. Includes drawings and diagrams.
- The Boiler Room
Forum to post residential steam related questions.
- Warmair.com
Information on heating system operation, components, troubleshooting and maintenance.
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