Missouri to Massachusetts: master HVAC technician license reciprocity
Missouri does not issue a statewide master HVAC technician license, so there is nothing to transfer. Here is Massachusetts's standard path for out-of-state applicants.
Your origin state does not issue a statewide license at this level, so there is no license to transfer. The destination's standard out-of-state path is shown; expect to meet it in full.
Reference only, not legal advice. Rules change; confirm with the licensing board before you apply. Full disclaimer.
Refrigeration Contractor by examination with out-of-state license credit (all states)
Your out-of-state credentials give no advantage. You meet the destination's requirements from scratch.
A master HVAC technician or HVAC/refrigeration contractor licensed in any other state applies to OPSI for the Refrigeration Contractor examination online through the My License portal or by mail. The Massachusetts prerequisites are 2,000 hours held and used under a Massachusetts Refrigeration Technician license plus 100 hours of post-apprenticeship refrigeration training at an approved school; the application form lets the applicant instead certify 'I held and used a refrigeration license in another jurisdiction for not less than 2000 hours' and that the 100 hours of additional training were taken at an institution in another jurisdiction, with employer and school documentation, and states that such an application may be forwarded to the Bureau, which may allow the candidate to sit for the examination. Under 528 CMR 11.07(1) the Bureau decides whether the out-of-state license and its underlying experience and education are substantially equivalent and may grant partial credit or deny the petition. The applicant also submits proof of age (18+) and a 2x2 photo with the $150 non-refundable fee, is notified about four to eight weeks after receipt, and must pass the contractor exam at 70% (a failing candidate reapplies). The exam is not waived for any state because the Bureau has no reciprocity agreement; the license renews for $75.
528 CMR 11.03 states the master prerequisite as 2,000 hours 'as a Massachusetts Journeyman Refrigeration Technician', while the Bureau's own contractor application accepts 2,000 hours under a refrigeration license from another jurisdiction if the Bureau agrees; the form governs in practice but the outcome is at the Bureau's discretion. The Bureau's published materials do not say whether it may instead require the applicant to obtain the Massachusetts Refrigeration Technician license first. No separate business or law examination is published for this license. The contractor how-to page and form list only the $150 application fee; no separate exam fee or initial license fee is published.
At a glance
- Trade exam
- Required
- Law / code exam
- Not required
- Out-of-state hours
- Count toward eligibility
What you must already have
- Your Missouri license must be active and in good standing.
- You must document at least 2,000 hours of qualifying work experience.2,000 hours held and used under a refrigeration technician-level license, documented by the employer; out-of-state hours are subject to the Bureau's substantial-equivalence review (528 CMR 11.07).
- 100 hours of additional (post-apprenticeship) refrigeration training from an approved school, or an equivalent course at an institution in another jurisdiction, documented by the school
- At least 18 years of age; Bureau approval to sit for the examination on out-of-state credentials
What you'll do to get licensed in Massachusetts
- 1Application fee. Pay the application fee ($150). Non-refundable Refrigeration Contractor application fee, payable to the Commonwealth of Massachusetts (Valor Act reductions for military).
- 2Other. Employer documentation of the 2,000 hours, school documentation of the 100-hour training, proof of age and a 2x2 passport-style photo (or RMV photo release).
- 3Trade exam. Pass the destination's trade exam. Massachusetts Refrigeration Contractor (Master Refrigeration Technician) examination administered by OPSI; 70% or better required; a failing candidate must reapply.
- 4Other. EPA Section 608 technician certification (Universal) to handle refrigerants; required of every Massachusetts refrigeration technician under 528 CMR 11.03 and federal law; does not expire.
Published fees on this path total $150, excluding exam-vendor fees, bonds, and insurance.
What you'll need to buy or arrange
Exam preparation
Most boards contract PSI, Prov, or ICC for exams. Check which code edition the exam is written to before buying a prep course.
- Trade exam
- Other
How Massachusetts licenses master HVAC technicians
Massachusetts master HVAC technician · “Refrigeration Contractor (Master Refrigeration Technician)”
Statewide license
Massachusetts' highest personal HVAC-type credential is the Refrigeration Contractor license, which M.G.L. c. 146, § 81 calls the 'master refrigeration technician' and 528 CMR 11.03 the 'Master Refrigeration Technician/Contractor'. It is issued by the Bureau of Pipefitters, Refrigeration Technicians and Sprinkler Fitters (OPSI) to an individual who has held and used a Massachusetts Refrigeration Technician license for at least 2,000 hours and completed 100 hours of additional Bureau-approved refrigeration training; it allows the holder to establish a refrigeration business and employ licensed technicians and apprentices, and the license number must appear on vehicles and invoices. The applicant pays a $150 non-refundable application fee and must pass the OPSI contractor exam at 70%; the license renews for $75. There is no general HVAC or mechanical contractor license in Massachusetts; hydronic heating contractors hold a Master Pipefitter license and oil-burner firms are certified by the Department of Fire Services. The contractor application lets an out-of-state applicant substitute 2,000 hours under a refrigeration license held in another jurisdiction and 100 hours of training taken elsewhere, subject to the Bureau agreeing to let the candidate sit the exam; the exam itself is never waived because the Bureau has no reciprocity agreements.
Why Missouri has nothing to transfer
Missouri master HVAC technician
Licensed by cities and counties
Missouri does not issue a master HVAC license or a statewide mechanical contractor license; the Division of Professional Registration licenses no HVAC or mechanical profession, and unlike the electrical trade there is no voluntary statewide contractor license for HVAC. The master-level credential exists only at the local level under names that vary by jurisdiction: Springfield certifies Master Mechanical craftsmen (4 years as a certified journeyman or 10 years of experience, ICC exam, $50), Kansas City issues a mechanical certificate of qualification to the supervisor who qualifies a licensed mechanical contractor (Prometric or ICC exam, $60 application, $181 four-year renewal), and St. Louis County and the City of St. Louis license mechanical contractors through their boards of examiners. An out-of-state master HVAC license carries no state-level recognition in Missouri, and none of these jurisdictions publish a reciprocity path for it; Springfield accepts an identical ICC, Prometric, Experior or Block exam score in place of retesting and Kansas City may accept a comparable exam it deems equivalent. A master arriving from another state should expect to qualify in each jurisdiction separately and then obtain that jurisdiction's mechanical contractor license to pull permits. EPA Section 608 certification is a separate federal requirement.
How local licensing works in Missouri
How local licensing works. Missouri has no state HVAC license and no statute standardizing local HVAC licensing; each city or county sets its own master, supervisor and contractor requirements.
Springfield. Building Development Services certifies Master Mechanical craftsmen: 4 years as a certified journeyman in the trade or 10 years of satisfactory experience, documented on notarized employer forms and approved by the Building and Trades board; ICC master mechanical exam through Pearson Vue (about $125), 75% to pass; certification card $50 with $50 annual renewal. 'Reciprocation' applicants submit copies of their other-state licenses and an identical-exam score of 75% or better from Prometric, Experior, Block or ICC; otherwise they test.
Kansas City. City Planning and Development licenses mechanical contractors ($55 application, $181 issuance, $181 renewal every four years) whose scope covers heating, duct and ventilation systems, refrigeration maintenance, gas piping to burners and control wiring. Every licensed contractor must employ a full-time supervisor who holds a Kansas City certificate of qualification in the mechanical trade; the certificate requires an application with notarized references and a passing score from a recognized agency such as Prometric or ICC ($60 application, first four-year certificate free, $181 renewal), and the city may accept a comparable exam from another jurisdiction if it deems it equivalent or superior.
St. Louis County. The Board of Examiners for Mechanical Licensing certifies mechanical contractors (a certified contractor list is published) and requires a licensed mechanical contractor bond and, for some applicants, a financial responsibility bond; applications and renewals go through the Accela portal. Master-level exam and experience details are not published on the pages that could be opened.
City of St. Louis. The Mechanical Contractors Board of Examiners (Ordinance 62579, City Code 25.10) reviews each applicant's qualifications for a Mechanical Contractor's license issued by the Building Division; the license is required to pull mechanical permits for boilers, furnaces, exhaust systems and ventilation. Contractors also need the city's graduated business license.
Out-of-state holders. No reciprocity or endorsement path for another state's master HVAC license was found in any of these jurisdictions. The practical route is to present an identical ICC or Prometric master mechanical score where accepted (Springfield; Kansas City case by case), document experience, and apply for the local master certificate and contractor license in each jurisdiction where work will be performed.
Common questions
- Do I have to take the Massachusetts master HVAC technician exam if I'm licensed in Missouri?
- Yes. Massachusetts requires the trade exam on this path.
- What does it cost to get a Massachusetts master HVAC technician license from Missouri?
- Published fees on this path total $150, not counting exam vendor fees or bonds.
- Do my Missouri work hours count in Massachusetts?
- Yes. Documented out-of-state experience counts toward Massachusetts's eligibility requirements.
- Does it work the other way, from Massachusetts to Missouri?
- Not necessarily. Reciprocity is directed. Going from Massachusetts to Missouri, the mechanism is not applicable.
Sources
- EPA Section 608 Technician Certification Requirements · 40 CFR Part 82, Subpart F (Clean Air Act §608) · U.S. Environmental Protection Agency · Other · verified September 15, 2026
- 528 CMR 11.00 - Prerequisites for Examinations for Pipefitters, Refrigeration Technicians and Sprinkler Fitters (Mass. Register #1534, 11/08/2024) · 528 CMR 11.03, 11.07 · Massachusetts Bureau of Pipefitters, Refrigeration Technicians and Sprinkler Fitters · Admin Rule · verified September 23, 2026
- Mass.gov - Apply for an Oil Burner Technician or Apprentice Certificate (Department of Fire Services) · 527 CMR 1.00 · Massachusetts Department of Fire Services · Agency Page · verified September 15, 2026
- MGL Chapter 146, Section 81 - Definitions (pipefitters, refrigeration technicians, sprinkler fitters) · M.G.L. c. 146, § 81 · Massachusetts General Court · Statute · verified September 23, 2026
- MGL Chapter 146, Section 85 - Applications for licenses; fees; expiration · M.G.L. c. 146, § 85 · Massachusetts General Court · Statute · verified September 23, 2026
- MGL Chapter 146, Section 86 - Classification and limitation of refrigeration licenses · M.G.L. c. 146, § 86 · Massachusetts General Court · Statute · verified September 23, 2026
- Mass.gov - Apply for a Refrigeration Contractor License · Massachusetts Office of Public Safety and Inspections · Agency Page · verified September 23, 2026
- Mass.gov - Bureau of Pipefitters, Refrigeration Technicians, and Sprinkler Fitters · Massachusetts Office of Public Safety and Inspections, Division of Occupational Licensure · Agency Page · verified September 15, 2026
- Mass.gov - Apply for or Renew a Pipefitters, Refrigeration Technician or Sprinkler Fitters License · Massachusetts Office of Public Safety and Inspections · Agency Page · verified September 15, 2026
- Massachusetts OPSI - Refrigeration Contractor Application (form) · Massachusetts Office of Public Safety and Inspections · Form · verified September 23, 2026
- Mass.gov - Renew your Pipefitter, Refrigeration Technician, or Sprinkler Fitter License · Massachusetts Office of Public Safety and Inspections · Agency Page · verified September 23, 2026
Verified dates are when a person last opened each source and confirmed the facts above. Cite the board, not us.