Apprenticeships   
Career Opportunities in HVACR   
Cool Careers   
General Maintenance Mechanic   

Home Appliance Repairer
HVACR Technician     
Plumber and Pipefitter   
Sheet Metal Worker

Learn the Basics

Absorption Systems
Absorption- How it Works
About Temperature
Boiler Conversions
Control Tutorials
Compressed Air Glossary
Copper Tube Handbook
History of Ammonium Refrigeration  New
History Resources and Links
HVACR History
How Air Conditioners Work
How a Heat Pump Works
How a Refrigerator Works
How Stuff Works
How Things Works
How To Guides - Plumbing
Indoor Air Quality FAQ
Lubricant Chart
Motor Formulae
Pressure Vessels
Pumps - Internet Glossary of Pumps
RES.org- Temperature Pressure Chart
Thermostats -Auto-Programmable
Thermostats - How They Work
Toiletology-Toilet Repair Tutorial
Soldered Joints


Math and Calculators

BTU Calculator
Circular Duct Differential Pressure Calculator
...Additional Math Resources


Heat Pumps

Carrier
Heat Pump Center
Heat Pumps- Save Energy
Heat Pumps - Water Loop
History of Carrier
Trane
York International


Refrigerants

Refrigerator History
Refrigerant Cycle
Refrigerant Handling
Refrigerant History
Refrigerant Safety


Energy,  Oil and Gas

Alternative and Renewable Energy Links
Clean Energy Basics
Consumer Energy Info
Energy and Power Resources 
Fuel Oil
Heating and Cooling - Energy Savers
Natural Gas - Info & Educational Resources
OilHeat.com
Petroleum Institute
Science Links & Resources

HVACR Directories and Links

Advanced Building Technologies
Air Conditioner & Refrigeration Achievements
American Gas Cooling
An Outlook for HVACR in 2020
Cool Net
Gas Cooling
Heating - Ventilation - AC - Refrigeration
HVACR Excellence
HVACR Industry Links
HVACMall
Popular Mechanics
Process Pumps and Filtration  New
Space Conditioning Systems
Technology Education Lab
Technology Education


Plumbing

History of Plumbing 
Plumbing-CAE and Repair
Plumbing and Pipefitting Tutorials New
Plumbing Systems
Plumbing Web 
Plumbnet


Repair, Maintenance and Construction

Build. Com
Building Materials
Construction Education
Construction Web Links
Electrical Links and Resources
Home Maintenance & Repair Encyclopedia
Microwave Repair
RepairClinic.com - Appliance Repair Help  New
Welding & Metal Work Resources


Jobs, Associations & Training

Air Conditioning Contractors of America
Air Duct Cleaners Association
Air Movement & Control Association
American Gas Association
ARTA - Ammonium Refrigeration Technician Association
ASHRAE
Certification - How to become NATE Certified
HVACJob- Employment Source
HVACR Related Organizations
Mechanical, HVAC Trade Organizations 
Indoor Air Quality Association
North American Technician Excellence - NATE
Trade Jobs Online - Plumbers, Pipefitters, Steamfitters
Training - NATE Education & Training Schools
...More Trade and Technical School Links


Safety

Occupational Safety Resources