Refrigeration Fundamentals
Learn how refrigeration systems actually work — from the vapor compression cycle and refrigerant transitions to superheat, subcooling, and real-world fault diagnosis.
About this course
Most technicians can follow a checklist. Fewer can look at a set of gauge readings and know what the system is telling them. This course closes that gap. You'll start with the refrigeration cycle itself — how refrigerant moves through a compressor, condenser, metering device, and evaporator, and why heat flows the way it does — then build outward into refrigerants, system components, and the two measurements that define a system's operating condition: superheat and subcooling.
By the middle of the course, you'll be reading pressure-temperature charts and interpreting diagnostic combinations that point to specific faults. By the end, you'll be working through real scenarios — manifold gauges in hand, deciding whether a system is overcharged, undercharged, restricted, or something else entirely. The course also covers the refrigerant transitions happening right now in the field: R-22 to R-410A, and R-410A to the newer A2L refrigerants like R-32 and R-454B, so you know what you're working with regardless of when the equipment was installed.
This is a fundamentals course, which means it's built for people early in their HVAC/R training as well as working technicians who want to fill in gaps and sharpen their diagnostic thinking. No prior refrigeration knowledge is assumed. What you will need is a willingness to think through how systems behave, not just memorize how they're supposed to look.
Details
Skills you'll learn
Refrigeration Cycle Analysis
Trace refrigerant through all four system components and explain what's happening to pressure, temperature, and state of matter at each point.
Superheat and Subcooling Measurement
Calculate and interpret superheat and subcooling readings to determine whether a system is operating correctly or pointing to a specific fault.
Pressure-Temperature Chart Reading
Use P-T charts to find saturation temperatures for common refrigerants at any operating pressure, without guessing or looking up memorized values.
Refrigerant Identification and Handling Awareness
Identify the refrigerants you're likely to encounter in the field today — R-22, R-410A, R-32, R-454B — and understand how regulatory transitions affect how you work with each one.
System Fault Diagnosis
Read a system's gauge pressures, superheat, and subcooling together to distinguish between common faults like improper charge, restricted metering devices, and compressor issues.
Syllabus
5 units • 15 lessons • 5 assessments
Learning activities
Every lesson gives you several ways to learn.
Frequently asked questions
Similar courses
AI For All
A clear, honest, and encouraging tour through how AI actually works — and by the end, you'll have used it to build real things yourself, including your very own live app.
AI for Creators (Without Losing Your Voice)
Learn how to use AI tools to do more creative work, faster, without sounding like every other creator who's using the same tools.
Build Your First App with AI
Learn to build and ship a real app using AI tools, no coding experience required, and walk away with something live that solves an actual problem.
How to Talk to AI (And Actually Get What You Want)
Most people type questions into AI and hope for the best. This course teaches you how to actually communicate with it — so you spend less time reprompting and more time getting work done.