Hi Joseph! Great question about what it takes to be ready for this line of work. There is more to doing the work than having a few wrenches and a work truck or van. Being able to show credentials to prove your knowledge and understanding is important for potential employers or customers.
There appear to be many related and relevant certifications you may want to consider; EPA 608 certification, EPA R-410A and NATE are a few.
Brian recommends the following next steps: