Start Here
New to HVAC? Start here for the learning path: fundamentals, equipment, components, diagnostics and practice.
Content is written for four levels — Beginner, Apprentice, Technician and Advanced — so you can read the same topic at the depth you need today.
- 1
Learn
Read the concept pages. Every topic explains what it is, why it matters, and where it is used.
Browse concepts - 2
Understand
Move to equipment and components to see how the parts work together in a real system.
Browse equipment - 3
See it
Follow the diagrams: the refrigeration cycle, furnace sequence of operation, control circuits and airflow.
Browse components - 4
Troubleshoot
Work symptom-first: likely causes, the checks that separate them, and what each reading means.
Browse troubleshooting - 5
A note on safety and code
This is educational reference material. It does not replace training, supervision, manufacturer instructions, or your local code. Requirements vary by jurisdiction, adopted code edition, permits and equipment — always verify before you install or service.