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Re:Ask HN: Any certification that is worth it? Legitimately ... by SoftTalker on Saturday June 25, 2022 @02:09PM (#31877389)
Correct me if I'm wrong but I think 80% of it boils down to "do not release refrigerant gas into the atmosphere"
Re:Ask HN: Any certification that is worth it? Legitimately ... by MerelyMortal on Saturday June 25, 2022 @02:22PM (#31877494)
You're not wrong.

The test does not cover how to do repairs or fix HVACs. I learned that elsewhere.