InspectAPedia HVAC
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Free reference encyclopedia of air conditioning and heat pump diagnosis, with photographs, wiring details and step-by-step fault trees. Useful for identifying refrigerant, airflow and control problems on residential equipment before calling a technician.
More resources on HVAC Basics
Energy Vanguard
Building-science blog by Allison Bailes covering duct design, Manual J load calculations, air sealing and dehumidification. Readers come away understanding why HVAC systems underperform in real houses and how enclosure choices drive equipment sizing.
Introduction to HVAC
Learn HVAC basics! This free course introduces heating, ventilation, and air conditioning systems.
HVAC School Podcasts and Free Training
Learn air conditioning repair with HVAC School! Free training and podcasts from Bryan Orr to boost your HVAC career.
Modern Refrigeration and Air Conditioning
Goodheart-Willcox trade textbook covering refrigeration cycles, refrigerant handling, compressors, controls and system service procedures. Working through it gives apprentices the theory and equipment knowledge needed for installation, diagnosis and EPA certification on residential and commercial systems.
HVAC Troubleshooting Guide
McGraw-Hill field manual organized around symptoms in heating, cooling and ventilation equipment, with wiring diagrams and test sequences. Readers finish able to isolate electrical, airflow and refrigerant faults using meters and pressure readings rather than guesswork.
U.S. Department of Energy
Official website of the U.S. Department of Energy, covering federal energy policy, the national laboratories, and programs in renewables, nuclear, fossil energy, grid modernization and efficiency. Readers find authoritative explainers, research news, funding opportunities and consumer guidance on home energy use.