You might want to compare the program options and costs/benefits from the Job Corps and EPCC. Visit both institutions and ask counselors questions about the program courses, length of program, and earnings potential once certified.
Harry recommends the following next steps:
You would need to attend a technical college to get the training necessary. To be a licensed HVAC technician usually requires a certification, which can be obtained through the technical college. That usually takes about 1 - 1.5 years. Good luck!