Free online courseLearn HVAC HVACR Heating Ventalation Air Conditioning

Course Description

Step into the HVACR trade with confidence by learning how heating, ventilation, air conditioning, and refrigeration systems actually move heat. This free online course is designed to turn confusing terms and scattered tips into a clear, practical mental model you can apply on real equipment. You will connect the laws of thermodynamics to everyday service calls, so concepts like temperature vs heat, sensible vs latent load, BTU, pressure, and saturation stop being abstract and start becoming tools for troubleshooting.

You will build a full-picture understanding of the refrigeration cycle and the role each component plays—from the compressor and discharge line to the condenser, metering device, evaporator, and suction line. Along the way, you will learn to interpret pressure and temperature together, use PT charts, and make sense of superheat and subcooling as measurement-based indicators rather than guesswork. This foundation supports better decisions whether you are working on a split system, a package unit, a window AC, a refrigerator, or a cooler.

Because HVAC work is hands-on, the course emphasizes service practices that prevent contamination and reduce mistakes. You will get comfortable with manifold gauge sets, hoses, low-loss fittings, and service valves, and you will understand why small details like valve cores, caps, o-rings, and proper purging matter. The course also connects measurements to outcomes, helping you recognize patterns behind common scenarios such as low airflow, dirty coils, overcharge, undercharge, restrictions, and low ambient conditions.

You will also develop core competence in modern field workflows: charging strategies, recovery and reuse rules, faster recovery approaches, evacuation and dehydration concepts, vacuum measurement, and nitrogen pressure testing for leak checks. In addition, you will strengthen your understanding of refrigerants, blends, glide, and why certain refrigerants have been phased out. Knowledge checks throughout the course reinforce key ideas so you retain what you learn and can apply it on the job. By the end, you will have a strong starting point for entry-level HVACR work and a solid framework for continued professional growth in refrigeration and air conditioning.