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> I researched how to diagnose them and do the easy fixes, ran into the EPA requirement, studied the material and got my EPA certification

Please write more or make a video or something. I have been thinking very seriously about doing exactly this.

HVAC is an absolute racket in my area, and nothing is ever a single-visit fix. If you don't sign up for their "maintenance plan" the fix mysteriously doesn't last very long.

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Not much to say. Pass the 608 (home hvac) or 609 (automotive). Buy the refrigerant at supplier. You can buy an expensive R134a refrigerant recycling system like the one I own for 609, but you can also use a less expensive refrigerant recovery system that's functionally a vacuum pump with built-in manifold gauges and a tank or just a vacuum pump, manifold gauges, and a recovery tank. Easy fixes are on YouTube. I am looking into setting up a refurbishment service for broken AC electronics. To me, it's just a motherboard and I can fix them with my soldering station.

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