Step 1

Register for the online courses you wish to take by clicking on the 'Register' link and pay with your credit card. An email will be sent to you with login instructions directing you to go to

Step 2

If this is your first time taking a course, go to the site and create an account. Once you have created your account, you will receive an email indicating your account is ready. Open this email, and follow the instructions to confirm your account. This normally takes less than one hour, but if you have not received a confirmation within an hour it has likely been blocked by your spam blocker. Send a note with your email to Carrier University. The account will be manually confirmed on the next business day.

Step 3

Once confirmed, you are now able to access the class on You will need to provide the enrollment key, which was included in your confirmation email. Please note, you will not need this enrollment key again for this class. You have access to this class for 4 weeks after first log-in.

Course No. Course Title Register
OL001 NATE Core Prep Class
OL002 ABCs of Air Conditioning
OL003 Basic Refrigeration Cycles
OLGTAC1 General Training Air Conditioning 1
OLGTAC11 GTAC 1: Introduction to Air Conditioning
OLGTAC12 GTAC 1: Temperature & Pressure
OLGTAC13 GTAC 1: The Refrigeration Cycle
OLGTAC14 GTAC 1: Systems
OLGTAC15 GTAC 1: Compressors
OLGTAC16 GTAC 1: Condensers
OLGTAC17 GTAC 1: Evaporators
OLGTAC18 GTAC 1: Metering Devices
OLGTAC19 GTAC 1: Electrical & Refrigerant Controls
OLGTAC110 GTAC 1: Refrigeration Cycle Accessories
OLGTAC2 General Training Air Conditioning 2
OLGTAC21 GTAC 2: Refrigerant Characteristics
OLGTAC22 GTAC 2: Refrigerant Oils
OLGTAC23 GTAC 2: Refrigerant Piping
OLGTAC24 GTAC 2: System Dehydration
OLGTAC25 GTAC 2: Charging, Recovery, Recycling & Reclamation
OLGTAC26 GTAC 2: Installation Procedures
OLGTAC27 GTAC 2: Heat Pumps
OLGTAC28 GTAC 2: Part Load
OLGTAC29 GTAC 2: Troubleshooting
OLGTE2 General Training Electrical (Fundamentals)
OLGTE21 GTE: Introduction to Electricity
OLGTE22 GTE: Electrical Components and Their Symbols
OLGTE23 GTE: Wiring Diagrams
OLGTE24 GTE: Wiring Diagram Exercises
OLGTE25 GTE: Electric Meter and Their Uses
OLGTE26 GTE: Alternating Current Fundamentals
OLGTE27 GTE: Motor Fundamentals and Motor Protection
OLGTE28 GTE: Electronic Devices and Circuits
OLGTE29 GTE: Electrical Troubleshooting
OLGTH2 General Training Heating 2
OLGTH21 GTH: Introduction to Gas Heating
OLGTH22 GTH: Principles of Gas Combustion
OLGTH23 GTH: Gas Furnaces
OLGTH24 GTH: Gas Burners
OLGTH25 GTH: Gas Controls
OLGTH26 GTH: Gas Ignition Systems
OLGTH27 GTH: Gas Safety & Operating Controls
OLGTH28 GTH: Furnace Installation Practices
OLGTH29 GTH: Ventilation & Combustion Air
OLGTH210 GTH: Gas Troubleshooting
OL IVU i-Vu Basic Self-Paced Online Tutorial