Servicing Electrical Systems and Components

Pass The Exam

Trusted By Top HVAC Agencies

Learn Everything You Need To Pass The NATE Ready To Work Exam

Electrical/General Safety

Heat Transfer

HVAC Tools/Components


Checking Fuses

In this topic, we will discuss where and how to check fuses on different components of HVAC systems.

Electrical Meter Ratings

In this topic, we will discuss the process of reading and understanding electrical meter ratings

Checking Motor Overloads

In this topic, we discuss how to check motor overloads.

Testing Winding Resistances

Winding resistance tests measure the applied voltage and ensure circuits are wired properly and connections are tight.

Voltage Tolerances and Voltage Imbalance

Voltage imbalances occur when there is a variation between the power system. Learn to test and make sure the voltage is within the required tolerances.


In this topic, we discuss how to test and replace start and run capacitors.

Testing Starting Relays

In this topic, we discuss how to test properly test and replace starting relays

Fan Blades and Seized Motors

Cleaning fan blades and blowers is critical to maintaining efficient airflow throughout a system. This topic will also cover how to repair seized motors.

Control Wiring Troubleshooting

Learn how to debug issues with control wiring, learn the common colors used across systems and thermostats.

Checking a Compressor

This topic covers frequent issues surrounding compressor operations, including slugging, flooding, and overheating.

Troubleshooting Motors

Fan motors are a critical component found throughout HVAC systems. Learn to service and maintain motors to keep optimum efficiency throughout the system, and understand how to quickly diagnose common issues.

Electric Furnace Power Issues

This topic will explore how to troubleshoot electrical furnace issues and replace frequently damages components in a system.

Frequently Asked Questions

How Is the online course set up?

When building the course, our goal was to make online HVAC training fun, engaging, and exciting! With that goal in mind, we have put a tremendous amount of multimedia material into our courses. As a student, you will never just be reading or listening to text- this is not a textbook!​ Every single part of our courses is full of compelling graphics, informative animations, and real-life images from HVAC systems. After each lesson- and within many lessons- you will be asked to answer HVAC technician questions or do HVAC system calculations focused on what you just learned. These HVAC system exercises make learning a lot more interactive and fun.

Will you help me get hired after the course?

Once you complete the online HVAC training, you will have the option to join our talent network. We have partnered with leading HVAC companies, and they are all hiring right now! Companies will look for new hands from this talent pool since you have proven your ability through training simulations and testing. To join our talent pool, take the HVAC assessment on our website.

How much do the online courses cost?

Nothing! Our online HVAC training is entirely free, and we have made it as simple as possible. We took out all the filler, which can cause similar programs to take up to a year, and worked with hiring managers to teach you the skills that you need to know to start your career in HVAC.

How do the simulations work?

We developed the HVAC training simulations based on real-world scenarios that you will encounter as an HVAC technician. These simulations allow us to test you on the information you just learned, and they teach you how to apply the knowledge to practical tasks.

Do I need a computer for the online training courses?

To take our free online HVAC course, you will need a phone, tablet, or computer with an internet connection. A lot of our graduates took classes while they were on the job site or in between jobs. The HVAC course is super convenient and always accessible.

Is there a textbook for the online training?

No textbooks here! We wanted to design a free, online HVAC course that wasn't boring. All of our courses use animations, simulations, and quizzes to teach you the skills you will need to become an HVAC tech.

Do hiring managers like online courses like this?

Absolutely. We designed these courses with hiring managers from large HVAC companies to be sure that everything in the course is essential and approved by them. Also, hiring managers love simulations since it gives them a better understanding of how you apply the knowledge you learned in the course. That gives you an advantage over anyone who has just been studying a textbook.

© LearnToDrill 2020

  • Grey YouTube Icon