To qualify, you may need to attend hvac workshops and training which provide you with professional certification. There are a few HVAC institutions that may help you to obtain the above certification.
The following is written by and according to the U.S. Department of Labor and particular to the education and training required for plumbers, pipefitters, and stemfitters. Most plumbers, pipelayers,...
Five year apprenticeship 10,000 hours plus 744 hours of class room studies codes, formulas etc and then work for a Master plumber for 5 years and once you have 10 years documented time in then you...