# Trades From Scratch by BRIX

Trades From Scratch is a free academy for people learning a trade and techs working toward running their own shop. Lessons are organized into tracks and modules, each explains one concept with worked examples, links practice questions and the matching state licensing page, and saves your progress in your browser.

## Lessons

- [HVAC From Scratch: A Free HVAC Course](https://www.brix.so/academy/hvac): A free HVAC course in 9 modules, from tools and safety to refrigeration, EPA 608 prep, licensing and running calls as a lead tech. No signup.
- [Superheat and Subcooling, Explained with Worked Examples](https://www.brix.so/academy/hvac/refrigeration/superheat-subcooling): Superheat and subcooling explained with worked R-454B and R-32 examples: which PT column to use, the formulas, common mistakes and five check questions.

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Canonical: https://www.brix.so/academy