Iowa HVAC License: Requirements, Fees and the Master of Record Rule (2026)

Iowa licenses HVAC work at the state level, through the same board that licenses plumbers: the Plumbing and Mechanical Systems Board (PMSB), housed in the Iowa Department of Inspections, Appeals and Licensing (DIAL). The statute is Iowa Code chapter 105, and the rules sit in 481 Iowa Administrative Code chapters 425 through 435.

At a glance

• Regulator: PMSB at DIAL, under Iowa Code chapter 105 and 481 IAC chapters 425 to 435.
• Five separate disciplines, including HVAC-refrigeration and mechanical, each with its own master of record.
• Contractor license plus registration: $400 for a full three-year period, plus a $5,000 bond and $500,000 liability insurance.
• Exams run through Kirkwood Community College, not PSI, Prov or Pearson VUE, at $119 per attempt.
• A master of record leaving starts a 30-day notice clock and a six-month grace period, not an open-ended one.

If a guide has told you Iowa HVAC licensing is handled locally, or has described a two-tier "contractor license plus technician certification" system with vague experience requirements, set it aside. New to licensing in Iowa? Start with the Iowa contractor license requirements, and for every other state see how to get a contractor license in each state.

Correcting the record: the journeyman experience rule

Several 2026 Iowa HVAC guides state that the journeyman mechanical license "requires documented field experience, typically 4 years in the trade." One of them also states that a master license "qualifies an individual to serve as a contractor's qualifying agent," and a decision table on the same page tells readers that commercial HVAC new construction requires a "Master or Journeyman qualifying agent."

All three statements are wrong, and the errors compound:

• Iowa does not accept generic field experience. DIAL's journeyperson licensing page states that beginning January 1, 2010, the four years of practical experience must come from an apprenticeship training program registered by the United States Department of Labor Office of Apprenticeship. Informal time in the trade under a licensed mechanic does not qualify.
• Iowa has no "qualifying agent" in chapter 105. The statutory construct is the master of record, and it carries its own rules: one contractor per discipline, a 30-day notice obligation, and a six-month grace period, none of which a page that never uses the term can describe.
• A journeyperson cannot be a master of record. The requirement is an active master license. Telling a commercial contractor that a journeyperson will satisfy it is the kind of error that surfaces at a bid opening.

The same guides cite the 2021 I-codes. Iowa's PMSB adopted the 2024 International Mechanical Code, effective March 26, 2025, and the 2024 Uniform Plumbing Code. They are a full code cycle behind.

Everything below is verified against DIAL's published licensing pages, Kirkwood Community College's exam fee schedule, and the Iowa Administrative Code as of October 2026.

Who regulates HVAC in Iowa

The Plumbing and Mechanical Systems Board licenses and regulates the plumbing, mechanical, HVAC, refrigeration, sheet metal and hydronic trades. DIAL administers it from 6200 Park Avenue, Suite 100, Des Moines, IA 50321; the board's main line is 866.280.1521.

• Iowa Code chapter 105 is the statute.
• 481 IAC chapters 425 to 435 are the rules. Chapter 425 is the state plumbing code; chapter 426 is the state mechanical code; 428 sets fees; 429 covers application, licensure and examination; 431 covers licensee practice; 432 covers continuing education.
• The adopted mechanical code is the 2024 International Mechanical Code (IMC), adopted by rule and effective March 26, 2025.

Permits and inspections are administered locally by city and county building departments. The license is a state credential.

Iowa licenses by discipline, this is the whole game

Iowa does not issue one blanket "HVAC license." It licenses five separate disciplines: plumbing, mechanical, HVAC-refrigeration, sheet metal and hydronic.

Every exam, fee and supervision rule attaches per discipline. A master licensed in HVAC-refrigeration may not superintend plumbing or hydronic work. On the business side, a contractor must have a master of record for each discipline in which it performs chapter 105 work.

That last point is where mechanical contractors get caught. A company doing rooftop units, boilers and the associated gas piping may be touching HVAC-refrigeration, mechanical and hydronic. If one master covers only one of those, the company is short a master of record for the others.

The Iowa HVAC license ladder

Notes: all fees are nonrefundable and prorated mid-cycle; a 30% multi-license discount applies when the same person files for journeyperson, master and contractor licenses together (see the continuing education section below).

Apprentice license

Iowa issues an apprentice license as the entry credential.

The supervision rule is stated from the employer's side and is worth quoting: a contractor "shall not knowingly allow an apprentice employed by the contractor to perform work covered under Iowa Code Chapter 105 without supervision of the apprentice by a master or journeyperson who is also employed by the contractor and who is licensed in the discipline in which the apprentice is performing such work."

The phrase also employed by the contractor is the operative one. Supervision cannot be outsourced to a licensee on someone else's payroll.

Journeyperson license

To qualify you must be at least 18, document any criminal convictions, and meet one of these:

• Provide evidence of at least four years of practical experience as an apprentice and pass the Iowa journeyperson examination for each discipline requested, with that experience coming from a U.S. DOL Office of Apprenticeship registered program for anyone accruing it since January 1, 2010, or
• Provide evidence of a master-level license in the same discipline from another jurisdiction.

Iowa defines "journeyperson" as any person other than a master who, as a principal occupation, is engaged as an employee of, or otherwise working under the direction of, a master in the design, installation and repair of the covered systems.

Practice rules for a journeyperson: work under the supervision of a master licensed in the discipline; do not knowingly perform chapter 105 work for an unlicensed contractor; supervise apprentices only in your licensed discipline and only while working for the same licensed contractor; do not knowingly supervise unlicensed persons performing licensed work.

Master license

Iowa defines "master" as a person who works in the planning or superintending of the design, installation or repair of the covered systems, is otherwise lawfully qualified to conduct that business, and is familiar with the governing laws and rules.

Exam eligibility requires either:

• A master license in another jurisdiction, or
• An Iowa journeyperson license plus two years of work experience.

A master must be available to supervise journeypersons and apprentices as needed, may only do so in the disciplines the master is licensed in, shall not knowingly supervise unlicensed persons performing licensed work, and shall not knowingly perform chapter 105 work for an unlicensed contractor.

Service Technician HVAC specialty license

This one is genuinely useful and almost never explained properly. It is a sublicense under an HVAC-refrigeration or mechanical license, and it defines a precise scope: work "from the appliance shutoff valve to the appliance and any part and component of the appliance, including the disconnection and reconnection of the existing appliance to the gas piping and the installation of a shutoff valve no more than 3 feet away from the appliance."

That three-foot boundary is the whole definition. Past it, you need the full credential.

Eligibility requires being at least 18, having no disqualifying felony conviction related to the profession as determined by the board, and submitting either valid certification from North American Technician Excellence (NATE) or an equivalent board-approved authority, or evidence of a Service Technician Associate degree or board-approved equivalent training. DIAL publishes an approved-provider list covering Kirkwood, Iowa Lakes and North Iowa Area community colleges, Midwest Technical Institute, HVAC Excellence and RSES certifications, and NATE's own programs.

The exams: Kirkwood, not PSI, Prov or Pearson VUE

Iowa's PMSB examinations are administered by Kirkwood Community College, at 15 testing sites statewide according to DIAL's own licensure page. This catches out nearly every contractor arriving from a neighboring state.

The sequence:

1. Submit an Exam Approval Application, $35 per trade discipline exam, to the board. Allow up to two weeks for processing.
2. On approval, schedule with Kirkwood at 319.398.1022. The examination fee is paid directly to Kirkwood, per attempt, and is non-refundable and non-transferable.
3. After passing, file a Post-Examination Licensure Application. The license fee is prorated to the remaining portion of the three-year period.

On the Kirkwood fee: DIAL's own examination page no longer publishes a dollar amount, it directs candidates to Kirkwood. (DIAL's journeyperson and master-license pages still carry older, unreconciled figures of $99 and $95 respectively, so do not be surprised if you see those instead.) Kirkwood's current State Disciplines fee schedule lists a flat $119 per attempt for Master Mechanical, Journeyperson Mechanical, and Master or Journeyperson HVAC-Refrigeration with Gas, the same figure across every PMSB discipline exam. Confirm the current amount with Kirkwood before budgeting, since the board does not guarantee it.

EPA Section 608 is federal, and it is not a substitute

Any technician who opens a sealed refrigerant circuit needs EPA Section 608 certification under 40 CFR Part 82: Type I for small appliances, Type II for high-pressure, Type III for low-pressure, or Universal. It is a federal credential that overlays Iowa licensing; it does not replace it, and it is not authority to perform chapter 105 mechanical work in Iowa.

Licensing periods, renewal, and the September 1 cliff

Iowa runs three-year licensing periods, and licenses expire at the end of the current period no matter when they were issued. The current period is July 1, 2026, to June 30, 2029; the next is July 1, 2029, to June 30, 2032; renewal opens May 1 of year three.

DIAL's posted guidance: PMSB licenses expire June 30 but are valid through August 31; renew in July to avoid fees; application reviews can take up to six weeks.

The late-fee ladder contains a hard stop:

• After July 1, $0 late fee, still eligible to work
• After August 1, $60 per license, still eligible to work
• After September 1, $100 per license, and not eligible to work
• More than one year expired, full renewal fee instead of a late fee, not eligible to work, reinstatement required

The money is trivial; the September 1 work prohibition is not. See contractor license renewal requirements by state and expired contractor license reinstatement.

Continuing education, and the 30% discount most licensees miss

Each PMSB license requires at least 8 hours of classroom instruction during each three-year licensing term, under Iowa Code section 105.20 and chapter 272C. The catch is approval, not volume: both the instructor and the course must be pre-approved by the board. Eight hours across three years is among the lightest requirements in the country; see contractor continuing education requirements by state.

Separately: applying for or renewing more than one of the journeyperson, master or contractor licenses lets you deduct 30% from the license fees, provided every license belongs to the same individual and all applications go in on the same day (online) or in the same envelope (paper). It excludes the $25 paper application fee, the $150 registration fee, and late fees. For a mechanical contractor whose master carries HVAC-refrigeration and mechanical licenses plus the contractor license, that is meaningful money every three years.

Becoming an HVAC contractor in Iowa

Holding a mechanical license and contracting as a mechanical business are separate regulatory acts. Our national explainer covers the general distinction between a contractor license and a business license; here is Iowa's version.

A "contractor," for PMSB purposes, is a person or entity providing plumbing, mechanical, HVAC, refrigeration, sheet metal or hydronic services on a contractual basis, paid a predetermined amount under that contract. Iowa requires mechanical contractors to be both licensed with the board and registered with DIAL, two obligations, one joint application.

Requirements for the PMSB contractor license:

• At least 18 years old
• Documentation of criminal convictions related to the profession, with a full explanation
• Application and fees
• Required bond and information to receive a DIAL Contractor Registration Number
• A valid unemployment insurance number, even with no employees
• Evidence of a permanent place of business
• Public liability insurance, a surety bond, and a master of record

Public liability insurance: minimum $500,000, from an insurer licensed in Iowa, with the certificate stating the policy will not be cancelled without 10 days' written notice to the board. Certificate holder: Bureau of Environmental Health & Contractor, Iowa Dept of Inspections, Appeals & Licensing, 6200 Park Ave Ste 100, Des Moines, IA 50321.

Surety bond: minimum $5,000, same 10-day notice requirement. Iowa is unusually specific about the obligee, and getting it wrong is a common rejection: the person responsible for the bond must be the customers of the principal, not the State of Iowa and not the board. Accepted wording includes "licensee's Iowa customers" or "Person(s) injured by Principal's breach of construction contract." Compare thresholds nationally in contractor bond requirements by state and contractor insurance requirements by state.

DIAL contractor registration under Iowa Code chapter 91C adds workers' compensation proof for any contractor with employees (certificate naming DIAL as holder), unemployment insurance compliance, and for out-of-state contractors a $25,000 surety bond on DIAL's out-of-state form, unless prequalified to bid Iowa DOT work, in which case a letter suffices.

Fees: contractor license $250 plus registration $150, $400 for a full period, prorated later in the cycle, plus $25 for paper filing. A self-employed contractor may file a notarized Fee Exemption Form covering the registration portion only, under Iowa Code 91C.1, if the contractor does not work with or for other contractors in the same phases of construction and does not pay more than $2,000 per year to employ others.

Hard deadline: a contractor license expired more than one year cannot be renewed; you file a new application with all bond and insurance documents again.

The master of record, Iowa's qualifier requirement

This is the provision that determines whether a mechanical company can hold a contract.

A contractor must show the board that it holds an active master license or employs at least one person holding an active master license under chapter 105 for each discipline in which it performs chapter 105 work. The master of record is the individual "responsible for the proper designing, installing, and repairing" of the systems and "actively in charge of" the contractor's work.

The three rules that follow:

1. One contractor per discipline. A master may be master of record for only one contractor per discipline at a time, absent prior board approval. The duty runs on the company too: a contractor "shall not knowingly utilize a master licensee to meet this requirement if the master licensee is simultaneously associated with another contractor in that discipline."
2. Multi-discipline masters may serve multiple companies, one per discipline.
3. Losing the master of record starts two clocks. A contractor may keep operating for up to six months without naming a replacement, but only if it notifies the board within 30 days of the separation. Miss the 30-day notice and the six-month grace period is gone. The departing master separately owes notice to both the board and the contractor within 30 days.

Full detail, including the certification form and what to do the week a master resigns, is in our Iowa master of record guide.

Where a qualifying agent fits

Iowa's master of record is a qualifier under a different name. The company signs the contract; a licensed master stands behind the competence. Lose that person without a replacement, and the company's authority to contract goes with them.

This is why mechanical contractors bring in a qualifying agent: a licensed master who joins the business as a W-2, full-time employee and serves as master of record so the company can hold its license and bid work. Iowa's own language points the same direction throughout: apprentice supervision must come from a licensee "also employed by the contractor," and neither a journeyperson nor a master may knowingly perform chapter 105 work "for an unlicensed contractor."

That structure is not compatible with attaching a licensee's credential to a company while keeping that person at arm's length on someone else's payroll. If you are considering that, read can a qualifying agent be a 1099 contractor and contractor license qualifier: owner vs. employee first.

New to the concept? Start with what a qualifying agent is. Ready to move? See hire a qualifying agent.

Iowa HVAC license FAQ

Does Iowa require an HVAC license? Yes. HVAC, refrigeration, mechanical, sheet metal and hydronic work are licensed statewide by the Plumbing and Mechanical Systems Board under Iowa Code chapter 105. Permits and inspections stay local; the credential is a state license.

Does the Iowa Board of Technical Professions license HVAC contractors? No. That board licenses engineers, architects, land surveyors, landscape architects and geologists. HVAC contractor licensing sits with the Plumbing and Mechanical Systems Board at DIAL.

Can I qualify for the journeyman exam with four years of on-the-job experience? Not by itself. Since January 1, 2010, the four years must come from an apprenticeship program registered with the U.S. Department of Labor Office of Apprenticeship. This is the most frequently misreported Iowa requirement.

Who administers Iowa HVAC exams, and what do they cost? Kirkwood Community College, at 15 sites statewide. Iowa does not use PSI, Prov or Pearson VUE for PMSB exams. The board charges a $35 exam approval fee per discipline; Kirkwood's own published fee schedule lists $119 per attempt for mechanical and HVAC-refrigeration exams at both journeyperson and master level.

What is the Service Technician HVAC specialty license? A sublicense under an HVAC-refrigeration or mechanical license covering work from the appliance shutoff valve to the appliance, including disconnecting and reconnecting an existing appliance to gas piping and installing a shutoff valve within three feet of the appliance. It requires NATE certification, a Service Technician Associate degree, or board-approved equivalent training.

How much does an Iowa HVAC contractor license cost? For a full three-year period, $250 for the PMSB contractor license plus $150 for DIAL contractor registration, $400 total, plus $25 for paper filing. Individual licenses are $50 apprentice, $180 journeyperson, $240 master for a full period, prorated mid-cycle. Add $500,000 public liability insurance and a $5,000 surety bond. Fees are set by the board and change; verify with DIAL.

What does a qualifying agent cost in Iowa? It depends on the disciplines you need covered, how many, your market, and the risk the licensee takes on by attaching their credential to your company. It is priced per situation, not off a rate card. See hire a qualifying agent for how the arrangement works.

How long can we operate if our master of record leaves? Up to six months, conditional on notifying the board within 30 days of the separation. Without that notice, the grace period does not apply.

Do I need a separate license for plumbing work? Yes. Iowa licenses per discipline, and your company needs a master of record in each discipline it contracts in. See our Iowa plumbing license guide.

Next steps

The individual path is: enter a DOL-registered apprenticeship, log four years, file a $35 Exam Approval Application, test with Kirkwood, then apply for post-examination licensure, and two years later, the master exam.

The company path has a different bottleneck. Bond, insurance and registration are paperwork with known prices. The master of record is a person, and if you do not have one on staff in every discipline you contract in, that is the item standing between you and a signed contract. If that is where you are stuck, call 615-219-2110 or see hire a qualifying agent.

Sources

• Iowa DIAL: Plumbing and Mechanical Systems License Fees (retrieved October 10, 2026)
• Iowa DIAL: Journeyperson License (retrieved October 10, 2026)
• Iowa DIAL: Master License (retrieved October 10, 2026)
• Iowa DIAL: Contractor License (retrieved October 10, 2026)
• Iowa DIAL: Examination (retrieved October 10, 2026)
• Iowa DIAL: Service Technician HVAC Specialty License (retrieved October 10, 2026)
• Iowa DIAL: Plumbing and Mechanical Systems overview (retrieved October 10, 2026)
• Kirkwood Community College: State Disciplines exam fees (retrieved October 10, 2026)
• Iowa Code chapter 105 (retrieved October 10, 2026)
• 481 Iowa Administrative Code chapter 426, State Mechanical Code (retrieved October 10, 2026)
• 481 Iowa Administrative Code chapter 428, Fees (retrieved October 10, 2026)
• EPA: Types of Technician Certification, Section 608 (retrieved October 10, 2026)

Related Iowa and regional guides: Iowa plumbing license · Iowa electrician license · Iowa master of record · Minnesota HVAC license · Wisconsin HVAC license · Missouri HVAC license · how to get an HVAC contractor license · browse all state guides