Do I have to take the Ohio master HVAC technician exam if I'm licensed in Mississippi?

The trade exam is waived, but Ohio requires a law or code exam.

How long do I need to have held my Mississippi license?

At least 1 year before applying.

What does it cost to get a Ohio master HVAC technician license from Mississippi?

Published fees on this path total $25, not counting exam vendor fees or bonds.

Does it work the other way, from Ohio to Mississippi?

Not necessarily. Reciprocity is directed. Going from Ohio to Mississippi, the mechanism is not applicable.

Mississippi to Ohio: master HVAC technician license reciprocity

Reciprocity· Exam waivedVerified September 15, 2026· 9 sources

Ohio has a reciprocity agreement with Mississippi: a Mississippi master HVAC technician can get a Ohio license without retaking the trade exam.

Reference only, not legal advice. Rules change; confirm with the licensing board before you apply. Full disclaimer.

Reciprocity with Mississippi (HVAC and Refrigeration; Ohio Business and Law exam required)

A signed state-to-state agreement. The trade exam is waived; you apply, prove your history, and pay the fee.

OCILB lists Mississippi for Electrical, HVAC, Refrigeration and Plumbing reciprocity with the Business and Law (B&L) exam required. An applicant who has held a Mississippi HVAC or refrigeration license for at least one year, obtained by passing Mississippi's examination, has the Ohio trade examination waived but must pass the Ohio Business and Law exam; licenses obtained by grandfathering or reciprocity must apply to take the full Ohio exam. The applicant files the Mississippi reciprocity application (one application and one $25 fee per trade), a Reciprocity Verification of Licensure completed under seal by the Mississippi licensing board with the exam score, a $500,000 certificate of liability insurance naming OCILB, and assigns the license to a contracting company.

The B&L requirement is stated on OCILB's contractors page list; the Mississippi form mentions the Business and Law exam only for grandfathered or reciprocity-obtained licenses.

At a glance

Trade exam: Waived
Law / code exam: Required
Agreement: Active

What you must already have

Your Mississippi license must have been obtained by examination, not by reciprocity or grandfathering.
You must have held your Mississippi license for at least 1 year.The Mississippi form requires the license to have been held for no less than one year.
Your Mississippi license must be active and in good standing.
You must have no disciplinary action or unresolved complaints on your record.

What you'll do to get licensed in Ohio

1Application fee. Pay the application fee ($25). Reciprocity application fee, non-refundable, per trade.
2Law / code exam. Pass a law, rules, or code exam. Ohio Business and Law examination (PSI).
3Insurance. Carry the required insurance ($500,000). Certificate of liability insurance of at least $500,000, certificate holder OCILB.
4Other. Reciprocity Verification of Licensure completed under seal by the Mississippi board, including exam score.
5Other. Assignment of the license to a contracting company (R.C. 4740.01).
6Other. EPA Section 608 technician certification to handle refrigerants; federal, does not expire.

Published fees on this path total $25, 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.

Law / code exam
Other

Liability insurance

Some states require proof of general liability or workers' compensation coverage at licensing time.

Insurance · $500,000

How Ohio licenses master HVAC technicians

Ohio master HVAC technician · “HVAC Contractor / Refrigeration Contractor (OCILB state license)”

Statewide license

Verified September 15, 2026· 6 sources

Issued by Ohio Construction Industry Licensing Board (OCILB), Ohio Department of Commerce

Ohio has no license called 'master HVAC'; its top person-held HVAC credential is the statewide HVAC Contractor license (with a separate Refrigeration Contractor license for refrigeration work) issued by the Ohio Construction Industry Licensing Board (OCILB) to an individual who qualified by examination (R.C. 4740.01(A)), who then assigns it to a contracting company. Other states' reciprocity forms pair this license with their master HVAC or mechanical contractor licenses, so it is treated here as the master level. A new applicant must be 18, a citizen or legal alien, have five years as a tradesperson in the trade immediately before applying (or be an Ohio registered engineer with three years of construction business experience), pass BCI and FBI background checks, pass both sections of the PSI-administered examination (trade and Business & Law), carry $500,000 of contractor liability insurance in one company name, and pay a $25 application fee and $25 license fee per trade; licenses expire annually and renew with 8 hours of continuing education (24 for three-year renewals). OCILB's published reciprocity list covers HVAC licenses from Alabama, Kentucky, Louisiana, Mississippi, South Carolina, Tennessee and West Virginia (refrigeration from Alabama, Kentucky, Louisiana, Mississippi and Tennessee), with the Ohio Business and Law exam still required for Louisiana, Mississippi, South Carolina and Tennessee licensees. Federal EPA Section 608 certification is required of anyone handling refrigerants but is not part of the OCILB application.

Moving to Ohio Leaving Ohio

Why Mississippi has nothing to transfer

Mississippi master HVAC technician

Licensed by cities and counties

Verified September 15, 2026· 11 sources

Mississippi does not issue a personal master HVAC license. The state-level HVAC credential is the Mississippi State Board of Contractors (MSBOC) contractor license: commercial 'Heat, Ventilation, A/C - HVAC' under the Mechanical classification (required on commercial jobs over $50,000; application and renewal $400, $300,000/$600,000 liability insurance, CPA-reviewed financial statement) or Residential HVAC (required for residential work over $10,000 in remodeling or $50,000 new construction; application $50, renewal $100). The license is issued to the business through a Certificate of Responsibility with a named qualifying party who passes the open-book PSI HVAC (or Residential HVAC) trade exam and the mandatory Mississippi Law and Business Management exam, so a master HVAC mechanic who only wants to work for an employer has nothing to transfer to at the state level; the personal master credential exists only in cities such as Southaven (Master Mechanical, $100, which itself requires an active MSBOC license, a $10,000 bond and liability insurance) and Gulfport (Mechanical/HVAC contractor license issued to the qualifying party, $100). MSBOC waives its HVAC trade exam, for $50 per exam, for qualifying parties who have held a license for at least one year with the Alabama Board of Heating, Air Conditioning and Refrigeration Contractors, the Alabama General Contractors Board, the Louisiana State Licensing Board for Contractors, the Ohio Construction Industry Licensing Board (HVAC or Refrigeration), the South Carolina Residential Builders Commission (Residential HVAC) or the Tennessee Board for Licensing Contractors, provided the license was obtained by that board's exam and there has been no disciplinary action in the period stated in each agreement; the Business and Law exam is never waived. EPA Section 608 certification is a separate federal requirement.

How local licensing works in Mississippi

State contractor license (business). MSBOC issues commercial and residential contractor licenses to companies through a Certificate of Responsibility. The commercial HVAC classification ('Heat, Ventilation, A/C - HVAC', with Ductwork, Refrigeration and Boiler specialties) requires the PSI open-book HVAC trade exam and the Mississippi Law and Business Management exam taken by the qualifying party (owner, officer or responsible managing employee), a $400 application fee ($400 annual renewal, $100 per additional classification), general liability insurance of $300,000 per occurrence / $600,000 aggregate naming MSBOC, and a CPA-reviewed financial statement showing net worth of $50,000 for a major classification or $20,000 for a specialty. Residential HVAC and Residential Mechanical (HVAC plus plumbing) licenses require the Residential HVAC (and Plumbing) exam and the Law and Business exam, a $50 application fee ($100 per additional classification, $100 renewal), proof of liability insurance with no minimum, three reference letters and documented experience in the classification.

MSBOC exam waivers for out-of-state qualifying parties. Reciprocity waives the trade exam only ($50 per exam waived, plus a $25 verification fee) after the origin board completes MSBOC's Reciprocity Verification Form; the applicant must have held the origin license for one year and passed that board's exam. HVAC waivers are available for the Alabama Heating and Air board (current license, Alabama exam), the Alabama General Contractors Board (HVAC can be waived; no discipline in the last year), Louisiana (HVAC can be waived but not mechanical or plumbing; the formal agreement ended but MSBOC continues to recognize Louisiana scores), Ohio CILB (HVAC and Refrigeration; no discipline in the last year), the South Carolina Residential Builders Commission (Residential HVAC; no discipline in three years) and Tennessee (all exams, the only state whose mechanical and plumbing exams are waived; no discipline in the last year). Arkansas, Florida, Georgia, North Carolina and the South Carolina Contractors Licensing Board agreements do not cover HVAC. Everyone takes the Mississippi Law and Business Management exam.

Southaven. Master Mechanical license ($100) for the license qualifier: application, photo ID, certificate of liability insurance, $10,000 surety bond in favor of the city, an active MSBOC contractor's license certificate and the company EIN. An out-of-state contractor without an MSBOC license must instead provide a letter of good standing from a municipality where its license is active and may not take residential projects or commercial projects over $50,000; the city defers to MSBOC on reciprocity.

Gulfport. Mechanical/HVAC contractor license ($100, waived with an MSBOC Certificate of Responsibility) issued in the name of the qualifying party: notarized application, current MSBOC license if held, five reference letters (waived with an MSBOC license), $100,000/$300,000 public liability insurance naming the city, home-jurisdiction privilege license and photo ID.

Out-of-state holders. A master HVAC licensee from another state who wants to contract in Mississippi applies to MSBOC as the qualifying party of a business, uses the exam waiver if the origin board is on the list, and then registers with each city; a master who only wants employment needs no state license and, in most cities, no personal card.

Moving to Mississippi Leaving Mississippi

Common questions

Do I have to take the Ohio master HVAC technician exam if I'm licensed in Mississippi?: The trade exam is waived, but Ohio requires a law or code exam.
How long do I need to have held my Mississippi license?: At least 1 year before applying.
What does it cost to get a Ohio master HVAC technician license from Mississippi?: Published fees on this path total $25, not counting exam vendor fees or bonds.
Does it work the other way, from Ohio to Mississippi?: Not necessarily. Reciprocity is directed. Going from Ohio to Mississippi, 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, 2026Federal requirement in every state: technicians who maintain, service, repair or dispose of equipment that could release refrigerants into the atmosphere must be certified (Type I small appliances, Type II high-pressure, Type III low-pressure, Universal). Apprentices under direct supervision are exempt. Certification does not expire; the core exam must be proctored for Universal certification. State HVAC boards commonly require it before licensure, but it is not itself a state license.
OCILB - Contractors & Contracting Companies (state license requirements, reciprocity list, document checklists) · Ohio Department of Commerce, Division of Industrial Compliance · Agency Page · verified September 15, 2026Opened through the r.jina.ai text proxy because com.ohio.gov returned 404 to the fetcher. States that OCILB issues state licenses to commercial contractors in five trades: Electrical, HVAC, Hydronics, Plumbing and Refrigeration. Requirements: age 18, citizen or legal alien, five years as a tradesperson in the trade (or Ohio registered engineer with three years of construction business experience), no disqualifying offense, pass the trade examination, $500,000 contractor liability coverage, fees; BCI and FBI background checks after board approval and before the exam. Fees: $25 application per trade, $25 licensing fee per trade, $60 annual escrow renewal. 'Reciprocity with other states' section: Ohio offers reciprocity only to applicants who passed the state-recognized test; Tennessee accepts Ohio grandfathered licensees; where noted the Business and Law (B&L) exam is required. List: Alabama - HVAC and Refrigeration; Arkansas - Plumbing; Kentucky - Electrical, HVAC, Refrigeration; Louisiana - Electrical, HVAC, Refrigeration - B&L; Mississippi - Electrical, HVAC, Refrigeration, Plumbing - B&L; North Carolina - Electrical; South Carolina - Electrical, HVAC, Plumbing - B&L; Tennessee - Electrical, HVAC, Refrigeration, Plumbing, Hydronics - B&L; West Virginia - Electrical, HVAC, Plumbing; Virginia - Electrical; Texas - Electrical. Reciprocity applicant checklist: notarized reciprocity application, OCILB verification form signed by the other state's board, $25 application fee per trade. The page says nothing about a journeyman, technician or individual HVAC license and nothing about EPA Section 608.
OCILB Examination Application (PDF) · Ohio Construction Industry Licensing Board · Form · verified September 15, 2026Standard route: last five consecutive years of tax documents plus one of: a permit for each of the last five years obtained by the licensed contractor employer, an active journeyman's card in the trade, an apprenticeship completion certificate (Ohio- or US DOL-approved), or 40 hours of live/virtual code continuing education from an OCILB training agency; or an Ohio registered professional engineer with three years of business experience; or five years as an Ohio government inspector in the trade. $25 application fee; exam types Hydronics, Electrical, HVAC, Plumbing, Refrigeration.
OCILB - Testing Application (form DIC 3524) · Ohio Department of Commerce, Division of Industrial Compliance · Agency Page · verified September 15, 2026Opened through the r.jina.ai text proxy. Lists the trades licensed (Electrical, HVAC, Refrigeration, Plumbing, Hydronics) and links the Testing Application PDF (DIC 3524); last reviewed March 2020.
OCILB - Reciprocity Application - Mississippi (EL, HV, RE, PL) · Ohio Department of Commerce, Division of Industrial Compliance · Agency Page · verified September 15, 2026Opened through the r.jina.ai text proxy. Covers Electrical, HVAC, Refrigeration and Plumbing; requires current Mississippi licenses obtained by passing Mississippi examinations. Last reviewed November 2024.
OCILB Mississippi Reciprocity Application (PDF) · Ohio Construction Industry Licensing Board · Form · verified September 15, 2026Types: EL, HVAC, RE, PL. Applicant must currently hold a Mississippi license for no less than one year and have tested with Mississippi; licenses obtained by grandfathering or reciprocity must apply to take the Ohio exam and the Ohio Business and Law exam. One application and one fee per trade; Reciprocity Verification of Licensure under state seal with exam score.
Ohio Revised Code 4740.01 - Construction industry licensing board definitions · R.C. 4740.01(A), (C), (E) · Ohio Legislative Service Commission · Statute · verified September 15, 2026'License' means a license the board issues to an individual as a heating, ventilating, and air conditioning contractor, refrigeration contractor, electrical contractor, plumbing contractor, or hydronics contractor. 'Tradesperson' means an individual employed by a contractor who performs the work without assuming responsibility for the means, method or manner of the work; tradespersons are not licensed under the chapter. 'Contracting company' is a company in the construction industry working on construction projects. Effective September 17, 2014.
Ohio Revised Code 4740.06 - License application; qualifications for examination · R.C. 4740.06(B), (C), (F), (H) · Ohio Legislative Service Commission · Statute · verified September 15, 2026(B) age 18, citizen or legal alien, five years as a tradesperson in the trade (or registered engineer with three years' business experience), contractor's liability insurance. (C) alternative qualification for holders of a substantially similar out-of-state license: at least five building authorizations and a tax return showing income under that license. (F) the specialty section authorizes the license within 90 days of the application once the applicant qualifies and passes the exam. (H) renewal without re-examination with continuing education. Effective September 30, 2025 (H.B. 96, 136th General Assembly).
Ohio Revised Code 4740.08 - Reciprocity · R.C. 4740.08 · Ohio Legislative Service Commission · Statute · verified September 15, 2026When a written reciprocity agreement between the states exists, an individual licensed in the other state who submits a copy of the agreement and pays the licensure fee is licensed without examination if the specialty section finds the other state's requirements substantially equal and that it extends similar reciprocity to Ohio licensees; the section may withdraw authorization for good cause before issuance. Effective December 29, 2023.

Verified dates are when a person last opened each source and confirmed the facts above. Cite the board, not us.

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