Learn · HVAC/R
HVAC/R
How heating and cooling actually work: the refrigeration cycle, airflow, electrical controls, and the certifications the work requires.
Learning paths
EPA 608: All Four Exams
Core plus all three types in one prepared sitting, straight to Universal
20 steps →
HVAC Technician from Zero
From nothing to a certified, employable technician's knowledge base
49 steps →
Commercial HVAC Systems
Move from unitary service work into central plants, multi-zone air and refrigerant systems, and building controls
10 steps →
HVAC Design Fundamentals
Turn comfort requirements into a defensible load, equipment selection, and duct system
9 steps →
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Content
Fundamentals 17 lessons
Refrigeration
Refrigerants
Electrical 8 lessons
Basics
Equipment 10 lessons
Refrigeration Equipment
Service 10 lessons
Procedures
Certification 10 lessons
Epa 608
Load and Duct Design 5 lessons
Hydronics and Boilers 4 lessons
- How a Hydronic System Moves Heat coming soon
- Residential Boilers coming soon
- Circulators, Zoning and Near-Boiler Piping coming soon
- Radiators, Baseboard and Radiant Floors coming soon
Commercial Systems 10 lessons
Airside
Ventilation and Air Quality 3 lessons
- How Much Outdoor Air a Building Needs coming soon
- Filtration and MERV coming soon
- Humidity Control coming soon
Safety 4 lessons
- Electrical Safety for HVAC Work coming soon
- Combustion Safety and Carbon Monoxide coming soon
- Rooftops, Ladders and Attics coming soon
- Hot Work and Brazing Safety coming soon