Moving to Michigan as a master HVAC technician: every state's rule

Michigan's HVAC credential is the Mechanical Contractor license issued by LARA's Bureau of Construction Codes under Article 8 of the Skilled Trades Regulation Act (2016 PA 407). Although called a contractor license, it is issued to an individual who qualifies by examination, so this file treats it as the master level: a business performs mechanical work by designating a licensed individual as its contractor of record (MCL 339.5809, 339.5815). The license is classified; an HVAC business typically holds HVAC Equipment (which includes ductwork and gas piping), Refrigeration and the heating and refrigeration/air conditioning service classifications. For each classification the applicant documents 3 years or 6,000 hours of experience with statements signed under penalty of perjury by each employing contractor of record (a 2-year HVAC program may be credited up to 1 year or 2,000 hours), is approved by LARA, and passes the PSI exam for that classification (75% to pass; the HVAC Equipment exam is 150 questions, open book, 3 hours, $100; other classification exams are 55 questions, 60 minutes, $50). The license fee is $300 for the 3-year cycle ($100 per year, prorated), licenses expire August 31 every third year, and municipalities may not impose their own licensing (MCL 339.5811). Michigan has no reciprocity with any state and no licensure by endorsement: LARA's out-of-state form states that Michigan 'does not reciprocate with any other state for licensing' and that out-of-state applicants must be approved to sit for the examination, so an out-of-state HVAC or mechanical contractor's experience counts toward eligibility but the Michigan exams must be passed. Federal EPA Section 608 certification is separately required to handle refrigerants.