The Massachusetts Refrigeration Technician license is issued through the Office of Public Safety and Inspections, in the Division of Occupational Licensure, acting through the Bureau of Pipefitters & Refrigeration Technicians, under Massachusetts General Laws Chapter 146 and 528 CMR 11.00. The license is required for anyone who performs refrigeration work having a capacity over 10 tons in the aggregate. The PassProfessor Massachusetts Refrigeration Technician program prepares candidates for the Commonwealth’s written examination and the pathway that earns admission to it.
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A credential that begins with a threshold
Most trade licenses are described by the work they cover. This one is described by a line. Massachusetts requires a Refrigeration Technician license for anyone who performs refrigeration work having a capacity over 10 tons in the aggregate. The trigger is capacity, not job title: the question is not what a worker is called but how much refrigeration capacity the work involves, measured in the aggregate — in totals across the work performed, not in the rating of a single unit viewed alone. And the wording is over 10 tons: the line sits above ten, and any summary that rounds it into a different phrase misstates where Massachusetts drew it.
Above that line, working without the license is working outside M.G.L. c. 146, § 85, which provides that no person shall work in refrigeration unless licensed under that section. The license must be carried on the person while engaged in refrigeration work and furnished on request to the Commissioner, the Chief, or a District Engineering Inspector.
The examination at a glance
| Item | Verified position |
|---|---|
| Program | Massachusetts Refrigeration Technician: the Journeyman Refrigeration Technician’s License under 528 CMR 11.03(2) |
| Regulator | Office of Public Safety and Inspections (OPSI), Division of Occupational Licensure, Bureau of Pipefitters & Refrigeration Technicians |
| Licensing threshold | Refrigeration work having a capacity over 10 tons in the aggregate |
| Examination | A written examination administered by the Commonwealth itself; no commercial examination vendor is involved |
| Passing standard | Candidates must correctly answer 70% or more of the examination questions to qualify for a license (528 CMR 11.03(2)(e)) |
| Operative eligibility | On or after November 9, 2026: 450 hours of approved study, 6,000 hours as a licensed Refrigeration Apprentice, EPA Section 608 Universal certification |
| Fees | $75 non-refundable application fee; $50 renewal fee — both Commonwealth instruments |
| Term | Biennial, anchored to the licensee’s birthday under M.G.L. c. 146, § 85 |
| Administrator note | PassProfessor is independent and is not affiliated with OPSI or the Bureau |
The operative pathway: 450 hours, 6,000 hours, EPA 608 Universal
Eligibility is date-sensitive, and the date that matters is November 9, 2026. For applications dated on or after that day, 528 CMR 11.03(2)(b) sets a single operative route: a formal 450-hour course of study in a refrigeration education course approved by the Bureau; an EPA Section 608 Universal certification; and refrigeration work experience totalling a minimum of 6,000 clock hours as a validly licensed Refrigeration Apprentice, verified by a licensed Master Refrigeration Technician or Refrigeration Contractor employer. Every applicant must also be a high school graduate or possess a state equivalency certificate.
Each element carries its own discipline. The study hours must come from a Bureau-approved course. The work hours must be served as a validly licensed Refrigeration Apprentice — licensed with OPSI, registered with the Division of Apprentice Standards, and employed by a Massachusetts Refrigeration Contractor for the duration of the apprenticeship — and hours count only while those conditions hold together. A Refrigeration Technician may supervise an apprentice’s work, but supervision alone does not make the hours count; the employment condition sits with the contractor. The regulation also fences credit: no credit for work for entities exempted under M.G.L. c. 146, § 88 unless part of a registered apprenticeship, and no credit for periods in which the individual held no valid Bureau license, the vocational-programme exception aside.
EPA Section 608 Universal certification deserves plain emphasis, because its posture differs sharply from state to state. Here it is a genuine prerequisite, written into the regulation’s eligibility text itself, and the application requires a copy of the Universal CFC Certification. A candidate who has not yet earned it has not finished the pathway, however complete the study and work hours may be.
The earlier pathways are closed history
Before November 9, 2026, the regulation offered three graduated routes, each combining Bureau-approved study, EPA Section 608 Universal certification, and apprentice work hours verified by a licensed employer: 250 hours of study with 6,000 work hours; 500 hours of study with 4,000 work hours; or 1,000 hours of study with 2,000 work hours. Those routes governed applications dated and received before that day and are closed to new applications now; this page records them as history because candidates will still encounter them in older material, and any preparation presenting the 250-hour route as currently available is stale. One narrow bridge remains: the Bureau may accept applications meeting the earlier requirements from individuals with a relevant, documented hardship, but no such waivers shall be granted on or after May 10, 2027.
The examination itself: written, state-administered, by Notice to Appear
The Refrigeration Technician examination is administered by the Commonwealth. OPSI holds examinations in such cities and at such times as may be necessary, its district engineering inspectors act as examiners, and examinations are held as applications are received, first come, first served. There is no commercial examination vendor for this sitting, no vendor bulletin and no vendor fee.
The published mechanics are these. Every applicant files the Division’s application form with the appropriate fee, and all completed and approved applications for examination must be filed 30 days before the day of examination. Applicants are notified by email approximately four to eight weeks after the Office receives the application, and receive a Notice to Appear with the date, time and location of the examination. The examination prescribed by 528 CMR 11.03(2)(e) is a written examination. After the sitting, the score is available on the OPSI website within approximately one week, and a candidate who passes receives the license by email. A candidate who does not earn a passing score must reapply to take the exam — no waiting period, attempt cap or retake fee beyond that rule is published. Results may be appealed under procedures set by the Commissioner, with no further review beyond that process.
The passing standard is a regulation sentence, quoted here exactly as 528 CMR 11.03(2)(e) prints it: candidates for examination must pass a written examination and must correctly answer 70% or more of the examination questions to qualify for a license. The same sentence is printed for the Master tier above this license.
What OPSI does not publish matters as much. There is no candidate bulletin for this examination, and the governing sources publish no question count, no duration in minutes, no content outline, no pretest count, and no statement of whether books may be brought into the examination room. This page states none of those figures in either direction, and candidates should treat any source supplying them with caution: those numbers do not exist in the Commonwealth’s published record. Preparation is therefore organised around the regulation, the work the license covers, and the study literature the Bureau itself recommends.
Recommended literature — recommended, and nothing more
OPSI publishes recommended exam study materials for pipefitters, refrigeration technicians and sprinkler fitters. Under the heading for the Refrigeration Technician and Refrigeration Contractor, its Recommended Literature lists three items: Refrigeration and Air Conditioning Systems — 522 CMR 9.00; Modern Refrigeration and Air Conditioning, by Althouse; and ANSI/ASHRAE Standard 15 and 34, in the 2013 Edition. The list is the Bureau’s pointer to where reading should concentrate — and its label controls its meaning. It does not state that the examination is drawn from, keyed to, or limited to those works, publishes no outline against them, and does not state that any of them may be taken into the examination room. This program presents the list exactly as OPSI presents it: recommended literature for study, never the examination’s tested references and never its allowed books. The 2013 edition on the ASHRAE entry is likewise a study-list figure, not the edition the field code adopts.
Two tonnage lines that must never be merged
Massachusetts refrigeration law contains a second tonnage figure, and confusing it with the licensing threshold is the most consequential reading error in this field. Separately from the over-10-tons licensing line, 522 CMR 9.00 — the Refrigeration and Air Conditioning Systems regulation administered under the Board of Boiler Rules — sets the scope of that safety and inspection code, and its scope section excludes, among others, systems having less than 20 tons capacity. Those are different lines, in different instruments, doing different work: the 10-ton line decides who must be licensed to perform the work; the 20-ton line helps decide which systems fall inside an inspection code’s scope. A system can sit on one side of one line and the other side of the other, and candidates should refuse any summary that collapses Massachusetts refrigeration law into a single threshold.
The field the license works in
The study literature is one layer; the codes governing installed work are another, and the two must not be merged. Massachusetts building work runs under 780 CMR, the State Building Code, Tenth Edition, first effective October 11, 2024 and based on modified versions of the 2021 International Codes, including the International Mechanical Code; the Ninth Edition concurrency period ended June 30, 2025. Fuel gas is governed by 248 CMR — the Massachusetts Fuel Gas Code at 248 CMR 4.00 through 8.00, which for most installations adopts NFPA 54 as modified by 248 CMR 5.00; Massachusetts fuel gas is not governed by the International Fuel Gas Code. Refrigeration systems sit under 522 CMR 9.00, whose construction section requires systems to be initially constructed in accordance with ASHRAE 15, ASHRAE 34 and ANSI/IIAR 2. These are field layers, and none is published as the examination’s keyed edition.
Where this license sits — and what it is not
Massachusetts has no general HVAC contractor license. The Commonwealth’s HVAC-adjacent examined licenses are this refrigeration family, administered through OPSI, and the separate sheet metal family administered by a different board under a different regulation — two frameworks inside one state, kept apart throughout this program. Below this license stands the Refrigeration Apprentice License, the DAS-registered, contractor-employed training tier through which the 6,000 operative hours are served. At this tier, the Journeyman Refrigeration Technician performs the licensed work and may supervise an apprentice’s work. Above it stands the Master Refrigeration Technician, also styled the Refrigeration Contractor’s License, whose holders may have a regular place of business and employ duly licensed people to perform refrigeration work; its gate is at least 2,000 hours as a Massachusetts Journeyman Refrigeration Technician plus 100 hours of Bureau-approved education. The Technician tier carries no place-of-business or employer authority — employing other licensees is precisely what the tier above adds.
Fees, term and renewal
Every dollar in this program is a Commonwealth instrument, because there is no examination vendor to pay. The application fee is $75, non-refundable — stated on the application form as a non-refundable processing fee payable to the Commonwealth of Massachusetts; the sources do not itemise any part of it as a separate examination fee, and the statute prints no dollar amounts, providing instead that the fees for the first license, for biennial renewal and for examination are determined annually by the commissioner of administration. The renewal fee for this license is $50. Licenses run on a biennial, birthday-anchored term: a license continues in force until the licensee’s birthday occurring more than twelve but not more than twenty-four months after its date, and renewals then expire on the birthday in the same even-year or odd-year parity, with a February 29 licensee’s license expiring March 1. Licenses are valid throughout the Commonwealth and are not transferable. Renewal notices go out 60 days before expiration, with a registration code for online renewal through the MyLicenseOne portal, and the renewal page states that licenses of this family require no further documentation for renewal. The governing sources pulled state no continuing education hours for this license, and this page states none. Licenses not renewed at expiration become void, and after one year are reinstated only by reexamination.
What the PassProfessor program will cover
Threshold first. The over-10-tons-in-the-aggregate threshold, the § 85 licensing duty, and the separate 20-ton scope line in 522 CMR 9.00 — taught as two instruments, never as one threshold.
The operative pathway as a checklist. The 450 hours of approved study, the 6,000 apprentice hours and the conditions that make them count, the high school or equivalency requirement, and EPA Section 608 Universal certification as the regulation’s own prerequisite — with the earlier pathways and the hardship window closing May 10, 2027 taught as dated history.
The regulation and the recommended reading. Original practice material built around 528 CMR 11.00 and the subjects OPSI’s Recommended Literature points to — 522 CMR 9.00, the Althouse text, and ASHRAE Standards 15 and 34 — presented throughout as recommended literature, because that is what the Bureau calls it.
Independence, stated plainly. PassProfessor is an independent preparation provider, not affiliated with the Office of Public Safety and Inspections, the Division of Occupational Licensure, or the Bureau of Pipefitters & Refrigeration Technicians. This program confers no license; the Commonwealth alone licenses. The companion guide — the Massachusetts Refrigeration Technician Exam Guide at /massachusetts-refrigeration-technician-exam-guide/ — works through the threshold, the pathway change and the examination record in full.
Tell me when enrollment opens. This program is in the works and enrollment is not yet open. Leave an email address and PassProfessor will write to you when the program is ready — and only about this program.
Frequently asked questions
What score passes the examination?
528 CMR 11.03(2)(e) states that candidates must correctly answer 70% or more of the examination questions to qualify for a license.
What does eligibility require now?
For applications on or after November 9, 2026: a formal 450-hour Bureau-approved course of study, 6,000 clock hours as a validly licensed Refrigeration Apprentice verified by a licensed Master Refrigeration Technician or Refrigeration Contractor employer, EPA Section 608 Universal certification, and a high school diploma or equivalency certificate.
Are the 250-hour, 500-hour and 1,000-hour pathways still available?
No. They governed applications dated and received before November 9, 2026 and are closed history. Documented hardship applications under the earlier requirements may still be accepted, but no such waivers shall be granted on or after May 10, 2027.
How long does the license last?
On a biennial cycle anchored to the licensee’s birthday under M.G.L. c. 146, § 85: the first term runs to the birthday occurring more than twelve but not more than twenty-four months after issue, and renewals keep the same even-year or odd-year parity. An unrenewed license becomes void, and after one year it is reinstated only by reexamination.
When does enrollment open?
The program is in the works and enrollment is not yet open. Leave an email address on this page and PassProfessor will write to you when the program is ready — and only about this program.