Free Courses / HVAC University A-Z

HVAC University A-Z

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Read me first: This course does NOT make you licensed, EPA-certified, insured, or qualified to do paid HVAC work alone. In North Carolina, contracting HVAC work requires a state license and handling refrigerant requires EPA Section 608 certification. Practice only the safe activities listed — never open, wire, charge, or repair real equipment without qualified supervision.

Welcome, future tech 👋

This is a free, 12-unit, ~120-hour course that takes you from zero HVAC knowledge to apprenticeship-ready. Every training video is embedded right here — you never have to leave this page. Your progress saves automatically in this browser.

How to use this course

Do the units in order — each one builds on the last. Plan ~10 hours per week (one unit per week).
Watch each video actively: pause at every new term, write a one-line definition in your own words, then resume. Tick “Mark watched” when done.
Read “The big picture” and “Critical points,” do the practice tasks, then take the quiz — answer out loud before revealing.
Download the unit notes (a one-page summary) and keep them in a binder.
When you meet the “Done when” standard, hit Mark unit complete and move on. Unit 2's safety quiz requires 100% — no exceptions.

🃏 Tool Flashcards

The 8 Hard Stops (memorize before Unit 3)

Never touch a capacitor — it stores a lethal charge even with power off.
Never open an equipment panel without supervision.
Never measure live circuits — multimeter practice is batteries only.
Never touch refrigerant connections without EPA 608 + supervision.
Never work on gas appliances. Gas smell = leave, call 911/utility from outside.
Never climb a damaged ladder; inspect before every use; never the top two rungs.
Stop at dizziness or cramps in heat — water, rest, shade (OSHA).
Carbon monoxide is odorless. CO alarm = everyone out, now.

About the videos and sources

All 48 videos were verified (title, channel, publish date, duration) and published within 5 years of the course's research date (2026-06-12). Three topics — ladder safety, power-tool safety, and data plates — have no qualifying current video; those units link the official OSHA pages and written guides instead, and say so plainly. Safety and certification facts are confirmed against EPA, OSHA, NIOSH, BLS, and North Carolina sources. If a video and an official source ever disagree, the official source wins.