Hawaii’s C-52 Ventilating and Air Conditioning Contractor is a specialty contractor classification under HRS Chapter 444, licensed to a contracting entity or sole proprietor through its responsible managing employee. The examination runs in two written parts — Part I Business and Law and Part II Trade — each 80 questions in 180 minutes, closed book, with 75% to pass each part. Hawaii has no statewide mechanical code, and the C-52 trade part keys to its bulletin-printed reference list, headed by the International Mechanical Code, 2018, as an exam reference only. This guide walks the whole Hawaii route: the entity framework, the experience gate, both sittings, and the biennial clock that governs the license afterwards.
This program is part of the expanding PassProfessor catalog — join the notify list and we’ll email you when enrollment opens.
The credential at a glance
| Item | Verified position |
|---|---|
| Program | Hawaii C-52 Ventilating & A/C Contractor — specialty contractor “C” classification |
| Regulator | Contractors License Board (CLB), Professional and Vocational Licensing Division (PVL), Department of Commerce and Consumer Affairs (DCCA) |
| Examination vendor | PSI Services LLC, from January 2023; Board approval is required before registration |
| Structure | Two written parts: Part I Business and Law (common examination) and Part II Trade (C-52) |
| Each part | 80 questions, 180 minutes, closed book |
| Passing standard | 75% to pass each part — a grade of seventy-five per cent is the minimum passing grade for each part (HAR §16-77-44) |
| Trade outline | General Knowledge and Code Requirements 34, Load Calculations 6, Control 10, Ducting and Insulation 8, Piping 8, Safety OSHA 4, Equipment 10 |
| Code position | No statewide mechanical code exists; the trade part keys to its bulletin-printed reference list, with the International Mechanical Code, 2018 as an exam reference only |
| Practical component | None published — both parts are written examinations |
The framework first: an entity license qualified by an RME
Every Hawaii contractor question sits inside one structural decision the State made long ago: the license belongs to the business. Under HRS Chapter 444, the Contractors License Board licenses the contracting entity or sole proprietor, and the entity is qualified by a responsible managing employee — the RME — who holds the experience in the classification and passes the examinations. The license issues to the entity through its principal RME. A candidate is therefore always applying in two capacities at once: as the individual whose record and sittings qualify the license, and on behalf of the entity that will hold it, contract under it, and answer for it.
The corollaries run through the whole system. There is no Hawaii journeyman, apprentice, technician, or helper license for air conditioning or refrigeration work — neither the statute nor HAR Title 16, Chapter 77 creates one, and journey-worker licenses exist in Hawaii only for electricians and plumbers under HRS Chapter 448E. Unlicensed individuals may perform the work only as wage employees of a licensed contracting entity; the RME is not a journeyman under a grander title but the qualifying individual of a licensed business. The entity must designate a principal RME in residence in the State, who signs or initials all contracts and is held responsible for violations. An RME may serve more than one entity only on Board approval, under the ownership and family conditions of HAR §16-77-72. A specialty licensee automatically holds the subclassifications of its own specialty, without examination or additional fees — but neither an “A” nor a “B” licensee acquires C-52 automatically, and work outside the classifications held is unlicensed activity. The license requirement reaches further than the tools: a license is required to act, assume to act, advertise, or bid as a contractor.
The C-52 scope, and the three boundaries around it
Exhibit A to HAR Chapter 16-77 states the C-52 scope in full: to fabricate, assemble, and install warm-air heating and air cooling systems, including heating and cooling solar systems, complete ventilating systems, and complete air conditioning systems — including, but not limited to, piping, controls other than electrical, instrumentation, building automation, energy management, and trenching, backfilling, patching, and surface restoration in connection with the installation of the air conditioning systems — and including the installation of thermal and acoustical insulation necessary to maintain heat, or sound, or both, within those systems. The installation of heat pumps related to the air conditioning system is expressly included.
Three boundaries define the classification against its neighbours, and each is a recurring examination theme precisely because each is crossed in real work every week. First, electrical work is carved out. Controls are in scope only other than electrical; the electrical classification holds its own territory, and a C-52 crew’s authority stops where electrical contracting begins, however integrated the system on the drawings. Second, fuel-gas piping sits in the plumbing classification, not in C-52. A gas-fired installation does not import gas-piping authority into the air conditioning license. Third, the handyman exemption is narrower than its dollar figure suggests. The chapter does not apply to a project whose aggregate contract price for labor and materials is not more than $1,500 — but the exemption does not apply where a building permit is required, and it does not apply where the work is part of a larger project or split to evade the chapter. Read the exemption as three conditions, not one number: price, permit, and project integrity, all satisfied at once.
The route, step by step
Step one — assemble the entity-and-RME application. A separate application is filed for each contracting entity and each RME, and both pay separately; one application may seek more than one classification. The application fee at this layer is $50 per application, non-refundable, payable to Commerce and Consumer Affairs, and an additional-classification application is likewise $50. Insurance prerequisites stand at issuance: workers’ compensation coverage, and liability and property-damage coverage of at least bodily injury $100,000 for each person and $300,000 for each occurrence, and property damage $50,000 for each occurrence, plus any surety bond the Board imposes.
Step two — prove the experience gate. The individual applicant or RME must show not less than four years of supervisory experience as a foreman, supervising employee, or contractor in the C-52 classification, within the past ten years, describing on-site supervision and direction of employees in the classification. Proof takes the Board’s specified form: not less than three notarised certificates, plus a Chronological History of Projects Form — the Project List — per classification. The applicant must be at least 18 years old and of good reputation for honesty, truthfulness, financial integrity, and fair dealing; an undisputed debt or judgment failure within the six years prior creates a presumption against financial integrity. Training may count toward the experience, up to a maximum of one year — a supplement inside the cap, never the record’s foundation.
Step three — obtain Board approval, then register. Board pre-approval is mandatory before PSI registration; there is no direct-to-vendor route. The approval letter states the date by which the examinations must be passed. Registration then runs through PSI’s Hawaii portal or its candidate line, for examinations delivered at Kapaa, Honolulu, Kahului, and Kailua Kona, with remote proctored delivery also offered.
Step four — pass both parts inside six months. The mechanics and the clock are detailed below; the headline is that both parts must be passed within six months of approval, or a new application and application fee are required.
Step five — hold the license on its fixed cycle, detailed near the end of this guide — including the verified absence of any continuing education condition.
The two parts, stated without blending them
Hawaii’s examination for a C-52 candidate consists of two written parts, administered as separate sittings with separate results, and this guide states them separately throughout.
Part I — Business and Law is a single common examination, not classification-specific: every new approved applicant sits the same Part I. By rule, it tests general knowledge of the building, safety, health, labor, and lien laws of the State and the basic administrative principles of the contracting business (HAR §16-77-39). Its published mechanics are 80 questions, 180 minutes, closed book, with the same passing standard as every part. In this guide Part I is treated as structure and boundary — its requirement, character, and mechanics in full, its detailed content the province of the catalog’s business and law family. That boundary is a catalog decision, not a judgement about its weight: Part I must be passed, on its own mark, before the license can issue. A candidate already licensed who is adding C-52 does not sit Part I again.
Part II — Trade (C-52) tests specialised knowledge in the particular classification (HAR §16-77-40). Its published mechanics match Part I exactly: 80 questions, 180 minutes, closed book. Its content outline and reference list are the subject of the next two sections. A candidate seeking two classifications sits a Part II for each — the trade parts are per-classification examinations, and no trade score transfers between them.
The passing standard is per part and is stated in the rule’s own words: “A grade of seventy-five per cent shall be a minimum passing grade for each part of any examination” (HAR §16-77-44). The bulletin prints the same standard as 75% minimum passing for each part. Nothing is averaged, banked, or carried between parts. One delivery rule sits across both parts: up to 10 experimental (unscored) questions may be administered on an examination, and their time does not count against examination time — the bulletin’s only unscored-item statement, recorded here in the bulletin’s own form. The 80-question figures for both parts are the scored published counts.
Both parts are closed book in the strict sense: reference material is study material and is not allowed in the examination center, and the misconduct rule gives the closure teeth — reference to crib sheets, textbooks, or other unauthorised materials is examination misconduct, with sanctions that may include invalidating the examination and suspension from retesting for up to three years (HAR §16-77-46). No hands-on practical or performance component is published for either part. Candidates arrive 30 minutes early with one government-issued photo identification, and no appointment may be made on the same day as a taken examination.
Part II in depth: reading the outline as a study plan
The trade outline sums to the 80 scored questions, and its proportions are the most honest study plan available for this examination. General Knowledge and Code Requirements — 34 questions. At more than two-fifths of the paper, this block is the examination: command of the classification’s framework — its scope, its boundaries, its governing statute and rules — together with the knowledge the bulletin keys to its printed references. Preparation that treats this block as preamble arrives underweight in the only area that can, by itself, decide the result. Control — 10, and Equipment — 10. A quarter of the paper: how systems are controlled — within the classification’s non-electrical boundary — and the equipment the classification installs, where an experienced candidate’s supervised years convert most directly into marks. Ducting and Insulation — 8, and Piping — 8. The fabrication core; the SMACNA duct standard on the reference list speaks directly to the first of these. Load Calculations — 6. The smallest technical block and the least forgiving: six calculation questions cannot be averaged away, and ACCA Manual N is on the list because this block exists. The study method is worked problems, end to end, until the method is routine. Safety OSHA — 4, anchored to 29 CFR Part 1926. Small blocks punish neglect out of proportion to their size.
The code question: an exam reference in a state with no statewide mechanical code
No layer of this examination is more often misdescribed, so this guide states it in full and in order. First: Hawaii has no statewide mechanical code. No statute or rule in the licensing frame adopts the International Mechanical Code or the Uniform Mechanical Code as a statewide code for private construction, and HRS Chapter 444 and HAR Chapter 16-77 contain no mechanical-code adoption at all. Second: that negative must not be overstated. Hawaii operates a State Building Code under HRS Chapter 107 through the State Building Code Council; the counties adopt and enforce building codes; state projects are subject to the state code directly. Code compliance in Hawaii is regulated — it is simply not regulated by one statewide mechanical edition, and this guide states no Hawaii field mechanical-code edition, because the fact base verifies none. Third: the illustration the sources give is Honolulu, whose code treats the International Mechanical Code as guidance only, in its own printed words: provisions in the International Mechanical Code are not adopted by that code but may be considered for guidance. Honolulu is an illustration of the county-level position, not a statewide rule, and the other counties’ positions were not verified county by county.
Fourth: the examination’s own position. The C-52 trade part keys to its bulletin-printed reference list, headed by the International Mechanical Code, 2018 — as an exam reference only. The remaining study references are Modern Refrigeration and Air Conditioning, 21st edition; ACCA Manual N, 5th edition (2008); SMACNA HVAC Duct Construction Standards, Metal and Flexible, 4th edition (2020); and 29 CFR Part 1926 (OSHA). None of these books is allowed in the examination center, and none is Hawaii’s governing field code. The examination therefore tests from a book the State has not adopted, for a license issued under a statute that adopts no mechanical code, in counties that each regulate construction their own way — the actual Hawaii position, and the thing the largest outline block exists to examine.
Fees and windows: three instruments, one clock
Hawaii’s money runs through three separate instruments, and merging them is the classic summary error. The PVL application layer: $50 per application, non-refundable, payable to Commerce and Consumer Affairs — entity and RME each file and each pay, and an additional classification on its own application is $50. The PSI examination layer: $80 per part for C-52, each part paid separately, non-refundable and non-transferable, valid for one year from payment; the rule itself sets no examination-fee amount, leaving it to the Board’s agreement with its vendor. The initial-license layer: this guide prints no initial-license fee total, deliberately and on the sources — PVL’s current application packets themselves print no initial amount, stating that specific amounts will be given at the appropriate time, and the only published totals in the fact base are dated figures that do not reconcile with the rule’s fee components or the forms’ own fee codes. Budget on the two verified layers and confirm the initial total with PVL when the Board gives it, rather than anchoring on any single total circulating in secondary material.
The clock matters more than the money. Applicants must pass the examinations within six months of approval; failure to pass inside that window means filing a new application and a new application fee (HAR §16-77-45). Inside the window, the bulletin’s delivery mechanics are comparatively forgiving: testing is unlimited within the eligibility window, an unsuccessful candidate may be able to retest within two business days, and reschedule or cancellation without forfeiting the fee requires notice two days before the appointment — with voicemail and email expressly not acceptable as that notice. Read together, the structure rewards a candidate who books early inside the window, leaves room for a second sitting, and treats the approval letter’s deadline as the fixed point the whole study plan hangs from.
Holding the license: renewal, restoration, and the absent CE duty
Hawaii contractor licenses run on a fixed biennial cycle: every license, regardless of issuance date, renews by September 30 of each even-numbered year. Failure to pay and submit by September 30 is an automatic forfeiture without a hearing, effective October 1, and an unrenewed license may not practise. For the current published period, October 1, 2026 through September 30, 2028, on-time renewal is $338.00 for a contractor entity (active), $338.00 for a sole proprietor (active), $208.00 for an RME (active), and $160.00 for any license on inactive status. Renewal is conditioned on continued qualification: a current state tax clearance, issued within six months, whose tax name matches the PVL license name exactly; continuous insurance at the issuance minimums; and any Board bond kept current.
A forfeited license may be restored on submission of all documents and fees plus a penalty fee within sixty days from September 30 — on or before November 30 of the renewal year. Published restoration totals for the same period are $388.00 for an entity (active), $388.00 for a sole proprietor (active), $258.00 for an RME (active), and $210.00 for inactive status. Failure to restore inside that window terminates the license, and the person must apply as a new applicant meeting current requirements — examinations included, unless the same-classification waiver applies.
One condition is verified absent, and its absence is itself examinable framework knowledge: Hawaii imposes no continuing education requirement for these licenses. No provision of HRS Chapter 444, HAR Chapter 16-77, the fee schedule at HAR §16-53-17, or PVL’s renewal requirements imposes CE hours, courses, or attestation on contractor entities, sole proprietors, or RMEs as a condition of renewal — and the continued-competency requirement Hawaii law imposes on electricians sits under a different chapter and board and must not be imported here. Reciprocity completes the picture, as another verified negative: Hawaii has no reciprocity agreements with any other state. Out-of-state experience may be documented toward the four-year gate, but both Hawaii examinations must still be passed; the sole waiver is for prior qualification by written examination in Hawaii in the same classification, within the four-year windows of HAR §16-77-41. EPA Section 608 certification is likewise not a condition of the C-52 license in any source pulled — the contractor law’s refrigerant provisions operate as conduct rules for licensees, not as a licensure prerequisite — and the federal certification is a separate program in this catalog.
A study plan built on this examination’s actual shape
Framework before calculation. Open with the classification itself: the Exhibit A scope, the electrical and fuel-gas boundaries, the handyman exemption’s conditions, and the entity-and-RME structure — the material the 34-question block rewards. Then the code discipline. Practise stating the three layers apart — exam reference list, licensing frame, county field position — until the IMC 2018’s role can be given in one sentence without the word “adopted”. Then the technical blocks in outline order: control and equipment from supervised field experience; ducting, insulation, and piping against the SMACNA standard; load calculations as daily worked problems; safety against the federal construction standards. Sit Part I as an examination, not an errand: a parallel track from the start. Work backwards from the approval letter: book first sittings early enough that a failure leaves a genuine second attempt inside the six-month window. Close-book rehearsal throughout: all timed practice runs from memory.
The errors this examination is built to catch
Calling the IMC 2018 Hawaii’s code — the merger the largest block exists to punish; it is an exam reference in a state with no statewide mechanical code. Overstating the negative — claiming Hawaii has no building regulation at all, when the State Building Code process, county enforcement, and state-project coverage are all real. Treating the RME as a journeyman, or searching for a lower Hawaii tier that does not exist. Blending the parts — preparing one composite sitting instead of two 80-question closed-book papers with separate pass marks. Budgeting a single initial-license total from secondary material, when PVL’s own packets defer the amount. Letting the six-month window expire through late booking, the one failure no trade knowledge repairs. Importing reciprocity or CE duties from other states’ regimes, both verified absent here. Crossing the scope boundaries in study examples — electrical controls and fuel-gas piping practised as C-52 work.
Hawaii C-52 in one view
Hawaii in one view is a licensing system that refused two things other states built: a tradesperson tier beneath the contractor, and a statewide mechanical code behind the examination. What stands instead is a business license qualified by a named, resident, accountable individual; a classification scope written in exhibit text and still governing; two closed-book papers of identical mechanics and separate pass marks; a trade paper keyed to a printed reading list whose first book the State pointedly has not adopted; and a fixed biennial date on which every license renews or falls. The candidate who studies the framework as the framework, the code position as a position rather than a gap, and the outline in its printed proportions is preparing for this license as Hawaii itself defines it. The companion program page, Hawaii C-52 Ventilating & A/C Contractor exam preparation, summarises the program this guide supports.
Independence, stated plainly. PassProfessor is an independent preparation provider and is not affiliated with the Contractors License Board, the Professional and Vocational Licensing Division, the Department of Commerce and Consumer Affairs, or PSI. This guide states the published route; the Board alone licenses, and only Board approval followed by PSI registration puts a candidate in the examination room.
Tell me when enrollment opens. The Hawaii C-52 Ventilating & A/C Contractor 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 exactly does the passing standard require?
A grade of seventy-five per cent as the minimum passing grade for each part of any examination (HAR §16-77-44) — printed in the bulletin as 75% minimum passing for each part. There is no averaging between parts.
What is on the trade part?
General Knowledge and Code Requirements 34, Load Calculations 6, Control 10, Ducting and Insulation 8, Piping 8, Safety OSHA 4, and Equipment 10, drawn from the bulletin’s printed reference list, headed by the International Mechanical Code, 2018 as an exam reference only. No reference material is allowed in the room.
If Hawaii has no statewide mechanical code, what code do C-52 licensees work under?
Building regulation runs through the State Building Code process under HRS Chapter 107 and through county adoption and enforcement; Honolulu treats the International Mechanical Code as guidance only. This guide states no single Hawaii field mechanical-code edition, because none is verified as a statewide adoption — and the absence of a statewide mechanical code does not mean code compliance is unregulated in Hawaii.
When does the license expire, and what restores it?
All licenses renew by September 30 of each even-numbered year, failing which the license is automatically forfeited effective October 1. Restoration is available within sixty days from September 30 — by November 30 — on all documents and fees plus a penalty; after that window the license is terminated and the person applies as a new applicant.
Does Hawaii require continuing education for contractor renewal?
No. No provision of the contractor statute, rules, fee schedule, or PVL renewal requirements imposes CE hours or courses on contractor entities, sole proprietors, or RMEs as a condition of renewal.
Is there a practical examination?
No practical component is published. Both parts are written examinations by rule, delivered by PSI, and both are closed book.
Is PassProfessor affiliated with the Hawaii Contractors License Board or PSI?
No. PassProfessor is an independent preparation provider, not affiliated with the Contractors License Board, the Professional and Vocational Licensing Division, the Department of Commerce and Consumer Affairs, or PSI.
When does enrollment open for the PassProfessor program?
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.