A journeyman HVAC license is the trade's mid-level rung: the qualified-worker credential.
In the states whose rules we verified, its holders work as employees and, where the state's law says so, supervise apprentices, while the master license adds what sits above that rung — supervising the business's workers or being in responsible charge, pulling the permit, and being the license a company contracts under.
The line between journeyman and master HVAC license is drawn state by state — this page maps it.
Supervision: who a journeyman can direct, who a master can oversee
Before comparing powers, check that your state actually has both rungs.
As of September 2026, 13 U.S. jurisdictions license HVAC workers at an apprentice, technician or journeyman rung — only about a quarter of jurisdictions.
The rest license the contractor or business only, license the master level only, split HVAC into fuel-gas, refrigeration or electrical pieces, or leave it to cities; the full map is in our guide to HVAC license requirements.
Even a worker license does not always mean a journeyman or master title.
Delaware and New Jersey license masters alone.
Texas requires anyone who assists a licensed air conditioning and refrigeration (ACR) contractor with maintenance or repair work to hold at least a TDLR technician registration; the tiers on the TDLR pages we checked are Registered Technician, the voluntary Certified Technician designation, and the ACR Contractor license (Class A/B), and those pages list no journeyman or master tier.
West Virginia has required an HVAC Technician Certification to perform or offer heating, ventilating and cooling work statewide since January 1, 2016, at three levels: HVAC Technician, HVAC Residential Technician and Technician in Training.
Arkansas requires workers who are not class holders to carry a registration and work only for an HVACR licensee, and North Carolina's technician license is optional for workers.
Where the two rungs do exist, the ladder's legal core is direction.
Start with who must be supervised: an Idaho HVAC apprentice may do HVAC work only under the supervision of an HVAC journeyman or contractor; West Virginia's Technician in Training must be directly supervised by an HVAC Technician; and Arkansas registrants can work only for an HVACR licensee.
The journeyman license sits on the supervising side of the Idaho rule — an apprentice's supervision may come from an HVAC journeyman or an HVAC contractor.
The same license binds you from above.
An Idaho HVAC journeyman works in the employ and under the direction of an HVAC contractor.
A New Mexico journeyman may work only when employed by an entity licensed — or holding an annual permit — for that type of work, on a certificate that is individual and non-transferable.
Connecticut journeypersons, such as B-4, must work in the employ of a contractor licensed for the work.
In the states whose rules we verified, the journeyman license qualifies you as an employee — not as an independent operator.
The master license reaches over you.
Delaware requires an HVACR business to have a Master HVACR licensee supervising its workers, and unlicensed employees — apprentices and journeymen alike — may do HVACR work only under a master who is their employer or works full time for the same business.
Any Iowa business doing mechanical work must at all times employ a licensed master who is actively in charge.
In New Jersey, HVACR work the master has not subcontracted may be done only by the master or by W-2 employees of the master or the HVACR business.
Kentucky shows the same umbrella from the other side: unlicensed employees working under a master HVAC contractor, who are not journeymen or apprentices and do not contract on their own, are exempt from the licensing law — the master's license is what makes their work legal.
Permits: who can pull the permit
Permits are where the rung line stops being abstract.
In every jurisdiction whose permit rule we verified — Rhode Island, New Jersey and Kentucky — permit authority sits with the master side of the business, not with the journeyman license held by the technician on the tools.
Rhode Island allows no one to contract, advertise or employ others in refrigeration and air-conditioning work without a master license, and the master's license number must appear on ads, contracts, bids and permits.
A New Jersey HVACR business must hold a pressure seal to pull HVACR permits, and it operates through a bona fide representative: a licensed master HVACR contractor.
Kentucky gives the rule a deadline — when a company's master dies, the company may keep using the deceased master's license for up to 180 days, and it must then have a new licensed master to pull permits.
Who issues the permit is a separate question from who holds the license.
Iowa licenses mechanical workers statewide, but state licensing has preempted city and county mechanical licenses there — local licenses became void on July 1, 2009 — while its cities may still charge permit and inspection fees.
On who may pull the permit in the first place, our research found no federal rule: the permit rules we did find live in state licensing law and local building codes, so that is where to confirm it.
Permit rules live in state law and local codes — confirm before you promise it
Qualifying a company: the master-only power
The sharpest legal difference is which license a company can run on.
In six jurisdictions the master-level individual license doubles as the contracting license: Maryland, Delaware, New Jersey, Kentucky, Connecticut and Rhode Island.
Maryland has no separate company license — contracting is done under an individual Master, Master Restricted or Limited HVACR license, and licensees who sign or approve contracts must carry at least $300,000 general liability and $100,000 property damage insurance, $400,000 combined, naming the HVACR Board as certificate holder.
In Delaware, the master license is what the business's workers operate under; Rhode Island requires either a licensed master as an officer or partner continuously supervising the work, or a contractor license backed by a continuously employed master.
Elsewhere the master is the qualifier behind a separate contractor license.
Virginia requires a master tradesman license as a condition of licensing HVAC contractors, and the qualified individual for an HVA contractor must hold the Master HVAC tradesman license.
An Iowa contractor license requires holding a master license or employing at least one master licensee — and any Iowa business doing mechanical work must have a licensed master actively in charge at all times, which for a sole proprietor means holding the master license personally.
Kentucky requires a master HVAC contractor in responsible charge, who must notify the department when that employment starts and ends.
The journeyman license carries none of this authority.
Connecticut's contractor licenses — the S-1, D-1, D-3 and B-1/B-3 classes, for example — are held by individuals, and its journeypersons work in the employ of a contractor licensed for the work.
New Mexico's journeyman certificates are individual and non-transferable, valid only inside employment by a licensed entity.
In none of the states whose rules we verified does a journeyman license qualify a company to contract: the employee credential and the qualifying credential are different rungs, and the six-state pattern above belongs to the master.
What the business adds on top of the qualifying license — insurance minimums, responsible-charge rules and contractor classes — is the employer's half of the story, in our guide to the HVAC contractor license by state.
And for the master rung itself — which states issue one, and what each requires — our guide to the master HVAC license has the detail.
How long between the two licenses
The states that use both rungs price the gap in journeyman years, and the numbers differ more than the titles do:
- Rhode Island — at least one year as a licensed Rhode Island journeyperson before you can sit the mechanical master exam (or an equivalent master license from another state)
- Iowa — at least two years of experience as a licensed journeyperson in the discipline (or a prior master license), plus the master exam
- Kentucky — the master HVAC contractor license takes at least 2 years as a journeyman HVAC mechanic under a master (or 2 years as a master-equivalent contractor elsewhere, or as a licensed mechanical engineer), plus the exam
- Maryland — at least 3 years of active experience as a licensed journeyman (or higher) under a master, at least 1,875 hours worked in the year before applying, and a 70% score on the master exam
- Delaware — a journeyman certificate from an apprenticeship meeting federal standards plus 2 years under a master, or 7 years under a master plus the apprenticeship equivalency ("by-pass") test — and the master exam either way
Not every state measures the gap in journeyman-license years.
A District of Columbia master refrigeration and air-conditioning mechanic needs at least 5 consecutive years, immediately before applying, spent working on systems larger than 25 compressor horsepower and verified in writing by a master.
New Jersey counts five years in the HVACR business, at least four of them in a U.S. Department of Labor-approved HVACR apprenticeship or training program and at least one as a journeyperson or licensed plumber — the journeyperson time is one ingredient, not the whole measure.
Stack the rungs and the climb is long.
Maryland's journeyman license alone takes an apprentice license held for at least 4 years with at least 6,000 hours of training under a licensed contractor, plus a 70% exam score; the master license then asks at least 3 years as a licensed journeyman (or higher) under a master on top of that.
If you have not yet earned your HVAC journeyman license, that is the rung to plan for first — in Maryland, Iowa, Kentucky and Rhode Island, the master requirement is measured from it.
Where you stop is a question of what you want to be legally able to do: run your own jobs and qualify a company, or work as the qualified employee under someone else's license.
If you are weighing the two rungs, browsing current HVAC technician jobs in your area is a practical next step.
This page is career information, not legal or licensing advice. Journeyman and master licensing is set by state boards and, where licensing is local, by city and county offices — confirm the current requirements with the authority for where you work before you apply, sit an exam or sign a contract.
Confirm the current numbers with the board