Mechanical Contractor HT • PSI • 50 Questions • 180 Minutes • 70% Passing • Open Book • Boiler Systems • Fuel Gas • Piping • Load Calculations • Ductwork
Preparing for the South Carolina Heating Contractor Exam? This guide covers the licensing process, official PSI test blueprint, code references, boilers, heating calculations, controls, and relevant study packages from Contractor Exam Preps.
Heating contractors help buildings stay safe and comfortable. That takes more than turning up a thermostat. Steam lines, gas piping, boilers, controls, and ducts all have their own rules, and the exam is designed to check whether you understand them.
Commercial Heating work is not just about making a building warmer. It can involve steam, hot water, fuel gas, boilers, piping, ducts, safety controls, and systems that must perform under demanding conditions. South Carolina requires qualified mechanical contractors because mistakes can affect property, employee safety, and occupants. A contractor who understands heat transfer, mechanical codes, and safe installation is better prepared for the job and the licensing examination.
South Carolina regulates commercial Heating under its Contractors' Licensing Board as a Mechanical Contractor classification identified by the letters HT. This classification is different from a general building license, a residential HVAC license, or a commercial Air Conditioning classification. Candidates should compare their planned work against the official scope before choosing exams, purchasing books, or advertising services.
Under the statutory Heating scope, covered work includes installing, replacing, altering, and repairing heating equipment and systems that use high- or low-pressure steam, vapor, or hot water. Related piping, ducts, mechanical equipment, and boilers within, adjacent to, or connected with a building may be included. Necessary gas lines serving the covered gas-fired equipment are also part of the described scope. Exact job duties, other trade licenses, permits, and local rules still matter.
Not quite. South Carolina lists Heating and Air Conditioning as separate mechanical classifications. The Air Conditioning category may cover systems that condition air for cooling or heating, but its published scope excludes hot-water or steam heating components. Heating (HT) is particularly important for those steam, hot-water, boiler, and related heating-system responsibilities. Passing an exam for one category does not automatically make every mechanical task legal.
The current PSI candidate bulletin identifies 50 questions on the commercial Heating technical examination. A passing result requires at least 35 correct answers, which equals 70 percent. Candidates are allowed three hours, or 180 minutes. These are Heating exam facts, not the numbers for the separate Residential HVAC or Air Conditioning examinations.
Yes. The South Carolina commercial contractor examination program permits approved references under testing-center rules. Open book does not mean open internet, loose handwritten notes, or unlimited materials. Use the PSI bulletin to confirm exact editions, permissible permanent tabs, highlighting, and examination security rules before test day. Knowing which reference to open is often as valuable as knowing the answer itself.
Heating candidates must also pass Business Management and Law for Commercial Contractors. Its published format is 50 questions, 125 minutes, and 35 correct answers to pass. The recommended reference is the South Carolina Commercial Contractors edition of the NASCLA Contractors Guide to Business, Law and Project Management. This examination tests business knowledge, not heating-pipe sizing or boiler controls.
The South Carolina Contractors' Licensing Board regulates the commercial contractor licensing path, and PSI administers the examinations. The candidate information bulletin tells you how to schedule, what identification is required, which references are approved, and how to read your score report. Rules can change, so check the bulletin again when booking rather than relying on an old screenshot.
The individual who satisfies the qualifying examinations and experience requirements serves as a qualifying party for the contractor business. South Carolina uses terms such as Primary Qualifying Party (PQP) and Qualifying Party (QP). The person demonstrates the necessary qualifications, while the applying business also supplies licensing documents, financial evidence or a bond, and fees. Passing an examination alone is not a state-issued business license.
South Carolina's exam-route qualifying-party process generally calls for at least two years of applicable experience during the prior five years. Obtain the current work-experience affidavit and read how qualifying experience must be documented. Contractors should not treat the work history of every jobsite employee as interchangeable with the experience required of a particular PQP or QP.
The Mechanical Contractor groups determine how large a job you may bid and perform under the license. Group 1 has a $35,000 per-job limit; Group 2, $100,000; Group 3, $200,000; Group 4, $400,000; and Group 5 has no dollar cap. Each level has its own working-capital, net-worth, or surety-bond requirements. Do not use South Carolina General Contractor financial-group figures for a Heating license.
The PSI reference list includes South Carolina-modified mechanical and fuel-gas codes, plus specialist resources for low- and high-pressure boilers, residential and commercial loads, duct sizing, piping, and refrigeration and air-conditioning fundamentals. Several approved books are substantial. You are better off becoming familiar with each book before exam day than discovering its index while the timer runs.
Start with the 2021 International Mechanical Code with South Carolina modifications, or the approved South Carolina Mechanical Code alternative named in the bulletin. Practice finding general requirements for appliances, air distribution, ventilation, combustion air, chimneys, vents, and hydronic systems. Read table footnotes and exceptions before choosing an answer. Code lookup is a skill, and a few good drills can save a lot of time.
Gas-fired heating equipment brings questions about gas piping, sizing, regulators, combustion air, venting, testing, and proper appliance connections. Study the International Fuel Gas Code edition approved for the exact examination. Learn how to read pipe-sizing tables and identify which table conditions apply. Guesswork is a terrible fuel-gas strategy, even when the choices on a multiple-choice test look friendly.
Load calculations help determine how much heating or cooling a space needs. Manual J focuses on residential loads, while Manual N is used for small commercial buildings. Building size, insulation, windows, infiltration, climate, and occupancy can affect the result. Practice reading the inputs, locating the correct calculation procedure, and checking units rather than memorizing a single number.
The Heating exam addresses low-pressure and high-pressure boilers as separate study categories. Review steam and hot-water operation, boiler components, water level, pressure protection, controls, combustion, feedwater, water treatment, maintenance, and safety. A candidate comfortable only with rooftop air-conditioning units may need extra time here. Boilers have their own vocabulary, and pressure is not a detail to wave away.
Piping questions can involve fitting types, layout, supports, material choices, and measurements. Duct questions involve airflow, velocity, friction loss, and duct dimensions. Practice with the Pipefitter's Handbook, Carrier design material, and the ACCA Ductulator as appropriate. The aim is to connect a jobsite question to the right reference before moving into the calculation.
The PSI Heating outline uses the abbreviation HARV. The outline gives separate categories for general knowledge and controls. Study heating-system operation, equipment, electrical and control fundamentals, thermostats, sensors, control sequences, system performance, and safe shutdown principles. You do not need to become an electronics designer, but you do need to understand what each control is meant to accomplish.
There are nine published Heating subject groups. Code Compliance has eight items. Load Calculation and Low-Pressure Boilers have seven each. Fuel Gas and Piping have six each. High-Pressure Boilers has five. HARV General and HARV Controls contain four each, and Ducts contains three. Together they total 50. This helps direct study effort toward the largest portions without ignoring the smaller topics.
A passing score report is an important milestone, not the last form in the stack. Follow the Contractors' Licensing Board application instructions for the applicable Mechanical Contractor license. Confirm the applicant business, qualifying-party records, experience affidavits, financial statement or bond, applicable fee, and any other requested documentation. Local permits and inspections still apply to the jobs you perform.
Contractor Exam Preps lists a South Carolina Heating Contractor Complete Book Package, Heating Contractor pre-printed reference tabs, and South Carolina Commercial Business and Law study resources. These products can help candidates obtain references and organize study, while the state and PSI remain the authorities for the examination and license. Match the advertised book editions and package components with your current bulletin before buying.
Begin by confirming that the Heating (HT) classification matches the steam, hot-water, boiler, or related heating work you plan to contract. Print the current PSI examination outline, confirm the permitted books, and set aside separate time for Business and Law. Build a short daily study routine, practice code navigation, take timed questions, and get your business documents organized before the scores arrive. It is a lot more pleasant than a last-minute paperwork bonfire.
For a focused set of references, explore the South Carolina Heating Contractor Complete Book Package. For the separate business test, review the Commercial Business and Law Complete Pass Package. Always use the current PSI bulletin to identify exact approved examination editions.
Important South Carolina Heating Licensing Update: The commercial Heating (HT) classification is a Mechanical Contractor classification, not the same as Residential HVAC or commercial Air Conditioning. The current PSI technical Heating exam includes 50 questions and a three-hour limit; 35 correct answers are required. Candidates also must pass the separate 50-question, 125-minute Business Management and Law examination. License approval depends on qualifying-party and experience records, application documentation, and the Mechanical Contractor financial group. Review the current bulletin and Board requirements before testing.
The South Carolina Heating classification is a commercial mechanical contractor license category. Its scope is especially relevant to steam, vapor, hot-water heating equipment, boilers, connected piping and ducts, and necessary fuel gas lines serving gas-fired heating equipment. It does not automatically cover every kind of residential HVAC or standalone air-conditioning job.
Licensing involves a qualified person and the applying business. The qualifying party demonstrates experience and examination knowledge. The business meets application and financial-group requirements. Exam prep materials support study but do not issue a state credential.
Classification: Heating (HT), Mechanical Contractor.
Regulator: South Carolina Contractors’ Licensing Board.
Trade test: PSI Heating, 50 questions, three hours, open book.
Separate test: Business Management and Law for Commercial Contractors.
Work scope: Verify permitted steam, hot water, boilers, piping, ducts, and gas-fired connections.
| Requirement | Published Information | What to Know |
|---|---|---|
| Classification | Heating (HT) | Mechanical Contractor classification |
| Regulator | SC Contractors' Licensing Board | South Carolina Department of Labor, Licensing and Regulation |
| Exam provider | PSI | Follow current candidate bulletin |
| Technical questions | 50 | Heating examination only |
| Technical time | 180 minutes | Three hours |
| Passing standard | 35 correct | 70 percent |
| Exam format | Open book | Only permitted reference materials |
| Separate exam | Business Management and Law | Required for Heating candidates |
| Business exam questions | 50 | Business exam, not Heating |
| Business exam time | 125 minutes | Published PSI format |
| Business passing | 35 correct | 70 percent |
| Business reference | NASCLA SC Commercial Contractors, 9th edition | Check current candidate bulletin |
| Heating codes | 2021 IMC with SC modifications or 2018 SC Mechanical Code | Bulletin-listed alternatives |
| Fuel gas code | 2021 IFGC with SC modifications or 2018 SC Fuel Gas Code | Confirm approved edition |
| Heating categories | 9 | Published PSI blueprint |
| Major heating category | Code Compliance | 8 questions |
| Other major category | HARV Load Calculation | 7 questions |
| Boilers - low pressure | 7 items | Distinct from high-pressure boilers |
| Boilers - high pressure | 5 items | Study safety and operations |
| PQP/QP | Qualifying person | Certification and experience apply |
| Experience pathway | Generally 2 applicable years in previous 5 | Verify affidavit requirements |
| License application | Doc. 165 | General and Mechanical application |
| Qualifying party initial filing | Doc. 168 | PQP/QP certification |
| Work experience affidavit | Doc. 167 | Confirm supporting evidence |
| Financial qualification | Statement or surety bond | Mechanical group requirements |
| Mechanical Group 1 | Up to $35,000 per bid/job | $3,500 working capital or $7,000 net worth or bond |
| Mechanical Group 2 | Up to $100,000 | $10,000 working capital or $15,000 net worth or bond |
| Mechanical Group 3 | Up to $200,000 | $20,000 working capital or $30,000 net worth or bond |
| Mechanical Group 4 | Up to $400,000 | $40,000 working capital or $60,000 net worth or bond |
| Mechanical Group 5 | Unlimited | $200,000 working capital or $300,000 net worth or bond |
| Mechanical renewal | October 31 of odd-numbered years | Check current Board renewal packet |
| Heating scope | Steam, hot-water, vapor systems | Includes specified boilers, connected mechanical systems and necessary gas lines |
| Air Conditioning | Separate mechanical classification | Do not assume identical scope |
| Packaged Equipment | Separate mechanical classification | Different equipment scope |
| Residential HVAC | Separate residential licensing process | Do not reuse its exam count |
| Code compliance | 8 items | Highest tested subject |
| HARV general | 4 items | General system knowledge |
| HARV controls | 4 items | Electrical and control systems |
| HARV load calculation | 7 items | Practice Manual J / N navigation |
| Fuel gas | 6 items | Gas piping, combustion air, venting |
| Piping | 6 items | Layouts, fittings, sizing |
| Ducts | 3 items | Ductulator and airflow |
| Official reference | PSI commercial contractor bulletin | Download before scheduling |
| Heating study books | Complete Book Package | Commercial Heating reference package |
| Reference tabs | Heating Pre-Printed Tabs | Tabs only, books not included |
| Business exam prep | Business and Law Package | Separate business exam support |
| Detail | License Path | Information |
|---|---|---|
| License type | Mechanical | Heating (HT) |
| Trade exam | PSI | Heating - Commercial Contractor |
| Trade questions | PSI | 50 |
| Trade duration | PSI | 3 hours |
| Passing answers | PSI | 35 of 50 |
| Trade passing rate | PSI | 70% |
| Trade format | PSI | Open book |
| Business exam | PSI | Business Management and Law for Commercial Contractors |
| Business questions | PSI | 50 |
| Business duration | PSI | 125 minutes |
| Business passing | PSI | 35 of 50 |
| Business reference | PSI | South Carolina NASCLA Commercial Contractors, 9th Edition |
| Technical blueprint | PSI | 9 categories totaling 50 items |
| Code Compliance | Heating | 8 items |
| HARV General | Heating | 4 items |
| HARV Controls | Heating | 4 items |
| HARV Load Calculation | Heating | 7 items |
| Fuel Gas Systems | Heating | 6 items |
| Piping | Heating | 6 items |
| Ducts | Heating | 3 items |
| Low-Pressure Boilers | Heating | 7 items |
| High-Pressure Boilers | Heating | 5 items |
| Mechanical Group 1 | License | $35,000 cap |
| Mechanical Group 2 | License | $100,000 cap |
| Mechanical Group 3 | License | $200,000 cap |
| Mechanical Group 4 | License | $400,000 cap |
| Mechanical Group 5 | License | Unlimited |
| Business applicant | License | Company or legal entity |
| Qualifying party | License | PQP / QP certification |
| Experience affidavit | License | As required by Board |
| Reference editions | Testing | Check PSI bulletin before buying |
| Scope | Work | Hot water, steam, vapor, boilers, connected systems |
Heating trade exam: 50 questions, 180 minutes, and 35 correct answers.
Business and Law: 50 questions, 125 minutes, and 35 correct answers.
Do not confuse: Mechanical financial groups with General Contractor groups, or commercial Heating testing with residential HVAC exams.
Review the 2021 IMC with South Carolina modifications or the approved 2018 state code alternative. Focus on appliance clearances, installation rules, ventilation, combustion air, chimneys, vents, hydronic requirements, and the way definitions and exceptions affect a decision.
Know heating, air, refrigeration, and ventilation concepts appearing in the PSI's HARV category. Review component functions, heat transfer, system operation, capacity, safety, and practical installation situations.
Study thermostats, sensors, relays, safety shutoffs, control sequences, electrical fundamentals, and equipment wiring diagrams. Learn which control should respond when a system overheats or loses safe operating conditions.
Practice residential and small-commercial load concepts using Manual J and Manual N. Learn the effects of insulation, floor area, infiltration, solar orientation, occupancy, and design conditions.
Work through gas pipe sizing, allowable materials, regulators, testing, combustion air, appliance venting, and table notes using the exam-approved fuel gas code.
Review hydronic and steam piping, pipe sizing, fittings, valves, supports, joining methods, pipe layout, and practical calculations with piping references.
Study air distribution, airflow, friction rate, duct size, velocity, transitions, and pressure loss. Practice a Ductulator rather than learning how to use it for the first time on exam day.
Review hot-water and steam heating systems, low-pressure boiler components, level and pressure controls, relief protection, burner operation, water treatment, and safety checks.
Study high-pressure boiler construction, operation, accessories, steam generation, controls, feedwater, safety devices, water treatment, and maintenance.
Official PSI outline: 9 topic categories and 50 total questions.
Study focus: These topics reflect the published categories; confirm approved editions in the latest bulletin.
Start with the current PSI technical outline and group its nine categories into practical study blocks. Keep the permitted books arranged by purpose: mechanical code, fuel gas, boiler systems, load manuals, piping, and HVAC technology. Read each table of contents and index before doing questions. Then practice locating information while a clock is running.
Because Code Compliance has eight items, learn the structure of the mechanical code early. Spend separate sessions on the seven-item Load Calculation and Low-Pressure Boiler categories. Fuel gas, piping, and high-pressure boiler topics also deserve serious attention. Do not ignore ducts and controls just because they have fewer questions.
Use the Heating Contractor Complete Book Package for a consolidated library and the Heating Reference Tabs for faster navigation practice. Those are educational materials, not a substitute for PSI approval of your exact exam-room books.
First: Verify Heating (HT), not a different HVAC classification.
Second: Gather bulletin-approved references.
Third: Study nine exam categories in proportion to their question counts.
Fourth: Practice timed code, boiler, piping, and load questions.
Fifth: Prepare separately for Business Management and Law.
This simplified illustration links a heat source, piping, heat emitters, and controls. It is an exam-study aid, not a stamped mechanical design or approved installation plan.
Educational only. Installations must follow adopted codes, manufacturer instructions, and professional design where applicable.
Compare the planned steam, hot-water, boiler, and connected piping scope against South Carolina rules.
Confirm 50 questions, three hours, approved code editions, reference rules, and test scheduling.
Prepare the PQP/QP work experience affidavit and confirm the current eligibility path with the Board.
Use the mechanical code, fuel gas code, load manuals, boiler books, piping guide, and HVAC textbooks.
Focus especially on code compliance, load calculations, fuel gas systems, piping, and boilers.
Meet the Heating test requirement and the separate Business Management and Law standard.
Select the correct Mechanical Contractor group and provide a qualifying financial statement or surety bond.
Submit the business and qualifying-party documents and follow renewal, permit, inspection, and scope rules.
The published Heating technical exam has 50 scored questions across nine categories. These exact topic counts come from the PSI Heating exam outline; percentages below are calculated from those counts. Use the chart to plan, not to predict an individual test form.
Combined item count: 50.
Largest category: Code Compliance, eight questions.
Next largest: HARV Load Calculation and Low-Pressure Boilers, seven questions each.
Passing minimum: 35 correct answers overall; no separate required score is stated for each category.
Use the official PSI bulletin as the final authority for exam-room books. Store package contents, publication reprints, and highlighted or tabbed options may differ. A study reference is not automatically approved simply because it covers the right subject.
| Book or Material | Edition or Status | Purpose |
|---|---|---|
| 2021 International Mechanical Code with SC Modifications | 2021 | PSI heating code reference; or 2018 South Carolina Mechanical Code |
| 2018 South Carolina Mechanical Code | 2018 | Alternative as listed by PSI |
| 2021 International Fuel Gas Code with SC Modifications | 2021 | PSI fuel gas reference; or 2018 South Carolina Fuel Gas Code |
| 2018 South Carolina Fuel Gas Code | 2018 | Alternative as listed by PSI |
| Trane Ductulator | Current approved tool | Airflow and duct-sizing practice |
| Low Pressure Boilers | 5th Edition | Low-pressure boiler operation, protection, and safety |
| High Pressure Boilers | 6th Edition, 2019 | High-pressure steam and boiler operations |
| Manual N - Commercial Load Calculation for Small Commercial Buildings | 5th Edition | Small-commercial load calculations |
| Manual J - Residential Load Calculations | Eighth Full Edition | Residential heat-loss and load calculations |
| System Design Manual Part III: Piping Design (Carrier) | Bulletin-listed edition | System piping design and distribution |
| Pipefitter’s Handbook | 3rd Edition, 1967 | Pipe layout, fittings and measurements |
| Modern Refrigeration and Air Conditioning | 21st or 22nd Edition | Heating and HVAC fundamentals |
| Refrigeration and Air Conditioning Technology | Check current PSI bulletin | Technical HVAC training and operation |
| NASCLA Contractor’s Guide to Business, Law and Project Management – SC Commercial | 9th Edition | Required separate Business and Law reference |
| South Carolina Heating Complete Book Package | Store listing | Study reference set from Contractor Exam Preps |
| South Carolina Heating Pre-Printed Tabs | Store listing | Tabs only for heating exam reference books |
Edition rule: The current PSI Heating bulletin governs the books permitted at your appointment.
Store product: The Heating Complete Book Package combines multiple mechanical references.
Business exam: Use the separate approved SC Commercial NASCLA business guide.
The books help only when you already know which book controls a question. Practice moving between the mechanical code, fuel gas code, boiler books, load manuals, and piping references. Approved highlighting or permanent indexing can speed navigation, but materials must meet the current PSI rules.
Time yourself. With 50 questions and three hours, you have an average of three minutes and 36 seconds per question. Some questions are quick, and others require several steps. Save time by answering short knowledge questions first and returning to tougher calculations.
The statutory Heating classification describes work with equipment and systems requiring high- or low-pressure steam, vapor, or hot water, including connected piping, ducts, mechanical equipment, boilers, and necessary gas lines if covered equipment is gas-fired. The Board also recognizes that HT licensees may perform Boiler Installation work under its classification guidance.
The exact legal scope matters. Separate classifications exist for Air Conditioning, Packaged Equipment, Plumbing, Electrical, and Refrigeration. A contractor should not assume an HT license covers unrelated trade work merely because several systems share a mechanical room.
Heating: Steam, hot-water, vapor and related systems.
Boiler Installation: Included for HT licensees under Board guidance.
Fuel Gas: Necessary gas lines connected to covered gas-fired heating equipment.
Other trades: Obtain separate authority when required.
| Credential | Typical Purpose | Important Difference |
|---|---|---|
| Heating (HT) Mechanical Contractor | Steam, hot-water, and vapor heating | This blog’s focus: PSI Heating exam plus Business and Law |
| Air Conditioning Mechanical Contractor | Commercial conditioned-air equipment | Separate scope and technical exam |
| Packaged Equipment Mechanical Contractor | Certain packaged HVAC equipment | Limits and exclusions depend on classification law |
| Boiler Installation | Boiler systems and connected piping | Board guidance recognizes HT authority for this work |
| Plumbing Mechanical Contractor | Commercial plumbing systems | Separate trade scope and exam |
| Refrigeration Mechanical Contractor | Commercial refrigeration installations | Separate mechanical classification |
| Residential HVAC | Residential heating and cooling licensing | Different regulator, application, and exam details |
| Business and Law Examination | Contracting operations and state obligations | Additional Heating applicant examination |
50 Questions • 180 Minutes • 70%
50 Questions • 125 Minutes • 70%
Groups 1–5 • Financial Qualification
The Heating exam has only 50 scored questions, but its reference library is broad. Candidates may need to switch from mechanical code to fuel gas piping, residential and commercial load calculations, hydronic layouts, ducts, controls, and low- or high-pressure boilers.
A three-hour limit gives an average of three minutes and 36 seconds per question. That sounds comfortable until you need to check a gas sizing table with several conditions or compare boiler safety devices. Successful study combines practical knowledge with reference-location speed.
Try full practice tests with the same number of questions and the same time allowance. Review both wrong answers and slow correct answers. Sometimes the answer is right but the process is too slow. Learning where to look can make the difference between a calm exam and an argument with a stack of books.
The following are related ContractorExamPreps.com product listings for Heating technical study and the separate Business and Law examination. Check current inclusions, editions, pricing, and availability directly on the product pages. Exam references must still meet the current PSI bulletin.
Mechanical Code • Fuel Gas • Boilers • Load Calculations
Best for: Candidates who need a consolidated library of major Heating exam references. Verify edition approval with PSI.
Index Tabs • Book Navigation • Tabs Only
Best for: Applicants who already own reference books and want faster chapter navigation.
NASCLA SC Business Book • Flash Cards • Online Course
Best for: Heating applicants preparing for their separate required Business and Law examination.
Heating trade: Use approved technical codes, boiler texts, load manuals, and piping references.
Reference tabs: The listed Heating pre-printed tabs are sold separately from the books.
Business requirement: Schedule and prepare for the separate 50-question Business and Law examination.
Actual ContractorExamPreps.com store image: South Carolina Heating Contractor Complete Book Set.
The pictured cover promotes an exam-preparation product. It is not a South Carolina government-issued Heating contractor license or PSI passing certificate.
Heating HT • PSI Open Book • Mechanical Codes • Fuel Gas • Steam and Hot Water • Boiler Systems • Load Calculations
South Carolina Heating Licensing
The South Carolina Contractors’ Licensing Board regulates the Heating (HT) Mechanical Contractor classification.
HT is the classification abbreviation for commercial Heating under the Mechanical Contractor licensing system.
No. Residential HVAC follows a separate path, and its exam details should not be used for commercial Heating candidates.
Board classification guidance recognizes that Heating (HT) licensees can engage in boiler-installation work within their scope.
The statutory Heating scope includes necessary gas lines connected to covered gas-fired heating equipment. Other gas work may require additional authority.
Groups 1 through 5 allow per-job limits of $35,000, $100,000, $200,000, $400,000, and unlimited, respectively, subject to their financial or bond requirements.
No. The applicant must also meet the Board’s qualifying-party, experience, application, financial, and fee requirements.
PSI Heating Examination
The current PSI Heating outline lists 50 scored questions.
The current published time limit is three hours, or 180 minutes.
Candidates must answer at least 35 of 50 scored questions correctly, which is 70%.
Yes. Only approved references may be used, subject to PSI rules for editions, tabs, highlighting, and notes.
Yes. South Carolina Heating candidates also take Business Management and Law for Commercial Contractors.
The published exam has 50 questions, a 125-minute time limit, and a 35-correct passing threshold.
Do not assume so. PSI restricts unauthorized loose or attached papers; use only materials permitted by the current bulletin.
Technical Study Topics
Nine, covering Code Compliance, HARV General, HARV Controls, HARV Load Calculation, Fuel Gas, Piping, Ducts, Low-Pressure Boilers, and High-Pressure Boilers.
Code Compliance, with eight questions in the published outline.
Yes. HARV Load Calculation contains seven questions in the official Heating outline.
Yes. Low-Pressure Boilers has seven questions and High-Pressure Boilers has five.
The PSI outline allocates six questions to Fuel Gas Systems.
Yes. Piping is a six-question category, and related work may require pipe measurements, fittings, and code lookups.
A Ductulator helps compare airflow, friction rate, velocity, and duct dimensions during air distribution sizing.
PSI uses HARV as part of its Heating exam subject names. Study the official General, Controls, and Load Calculation categories as written in the bulletin.
Books, Code Editions, and Study
The current PSI list includes the 2021 International Mechanical Code with South Carolina modifications or the listed 2018 South Carolina Mechanical Code alternative.
The current PSI list includes the 2021 International Fuel Gas Code with South Carolina modifications or the listed 2018 South Carolina Fuel Gas Code alternative.
Manual J supports residential heating and cooling load calculations.
Manual N supports load calculations for small commercial buildings.
Yes. Its South Carolina Heating Contractor Complete Book Package combines major mechanical, gas, boiler, load, piping, and HVAC references.
Yes. Contractor Exam Preps lists Heating Contractor Exam Pre-Printed Tabs as a tabs-only product.
Not necessarily. The South Carolina Commercial Business and Law package targets the separate business examination; review its current inclusions before ordering.
No. They support preparation but cannot guarantee a passing score, reference approval, or state licensure.
Application and Exam Day
The exam-route qualifying-party path generally requires two years of relevant experience within the previous five years. Confirm with the current Board application and affidavit.
A Primary Qualifying Party is the principal individual identified by the applicant as responsible for directing or reviewing work in a licensed classification.
The Board’s published application instructions state that Mechanical Contractor licenses expire October 31 of odd-numbered years.
Bring the identification and approved references described in your PSI scheduling confirmation and current candidate bulletin.
Yes. It covers business operations and legal responsibilities that are different from the technical Heating subject categories.
Watch this related 1ExamPrep YouTube video on the South Carolina Heating Contractor examination. It covers the commercial Heating study pathway, open-book reference navigation, and exam preparation. Use the current PSI bulletin for authoritative exam requirements.
Creator: 1ExamPrep.
Video: How to Pass the South Carolina Heating Contractor Exam.
Trade: South Carolina commercial Heating, HT Mechanical Contractor.
Official testing: PSI Heating is 50 questions, three hours, 35 correct to pass.
Use Contractor Exam Preps to compare study materials and the South Carolina licensing authorities for qualification, exam, reference, and licensing rules. Here are direct links organized as a responsive resource grid.
Heating technical exam: 50 questions, 180 minutes, 35 correct.
Business exam: 50 questions, 125 minutes, 35 correct.
License: South Carolina Heating (HT), Mechanical Contractor.
Store materials: Heating books, tabs, and Business and Law preparation.
Preparing for the South Carolina Heating Contractor exam is a practical step toward qualifying for commercial mechanical heating work. The trade deals with equipment that people rely on every day, including boilers, hot-water piping, steam systems, controls, fuel gas connections, and heating distribution. Safe work demands an understanding of how these parts connect, why they are installed in a particular way, and where the governing code requirements can be found.
The correct license is the starting point. South Carolina calls the commercial classification Heating, abbreviated HT, under its Mechanical Contractor system. That designation is not identical to Residential HVAC, Air Conditioning, or Packaged Equipment. The Heating scope focuses on steam, vapor, and hot-water heating equipment, connected piping and ducts, boilers, and necessary gas lines where the covered equipment uses gas. Identifying the classification first helps you avoid preparing for the wrong examination.
The South Carolina Contractors’ Licensing Board regulates the licensing path, while PSI administers the required tests. The published Heating technical examination has 50 questions and a three-hour limit. A candidate needs 35 correct answers, or 70 percent, to pass. The exam is open book, but only permitted references can be brought into the examination environment. An open-book test is not a contest to see who can carry the biggest pile of books.
Instead, candidates must learn how to use the right reference quickly. Practice finding definitions, code chapters, sizing tables, exceptions, and equipment requirements without losing track of the question. The PSI examination outline provides a helpful study map. Code Compliance accounts for eight questions, while HARV Load Calculation and Low-Pressure Boilers contribute seven questions each. Fuel Gas Systems and Piping each have six, High-Pressure Boilers has five, HARV General and HARV Controls have four each, and Ducts has three.
That outline suggests a balanced study plan. Begin with mechanical-code navigation, including installation rules, clearances, combustion air, ventilation, ducts, and hydronic systems. Study fuel-gas piping and venting as their own subject. Practice working with Manual J and Manual N rather than simply remembering their names. Learn how a Ductulator connects airflow, duct size, velocity, and friction. Work through pipefitting examples until the relevant tables and formulas are familiar.
Boilers also need dedicated attention. Low-pressure boiler questions and high-pressure boiler questions cover related but distinct concerns. Review operating principles, safety devices, water treatment, feedwater, pressure, controls, and combustion. Many candidates are comfortable with common air-conditioning equipment yet have less exposure to steam equipment. A study plan should close that gap before it becomes an exam-day surprise.
Remember that South Carolina requires another examination. Business Management and Law for Commercial Contractors contains 50 questions, allows 125 minutes, and requires 35 correct answers. That test covers business management, bids, contracts, project administration, insurance, finances, taxes, employment responsibilities, and related subjects. Preparing for the Heating trade test does not automatically prepare you for the business examination.
Licensing responsibilities continue after testing. A qualifying party must meet the applicable experience and certification requirements. The applying business must provide the correct documents, licensing fee, and evidence supporting its Mechanical Contractor financial group. Groups one through five carry different limits, and the unlimited category requires stronger financial support or bonding. These are mechanical limits, not the separate financial figures for general building contractors.
Contractor Exam Preps provides related South Carolina Heating books and reference tabs, plus preparation materials for the separate business examination. The products can help organize learning and improve your familiarity with the books, but they cannot guarantee a score or replace official licensing approval. Compare every advertised edition and package component against the latest PSI bulletin before relying on it.
A steady routine works best. Study a small number of subjects each week, practice with the real references, complete 50-question timed sessions, and review every slow lookup as carefully as every wrong answer. Keep the work-experience affidavit, business application, and financial documents moving alongside your study. When the test and the paperwork are both prepared, the journey from exam candidate to licensed Heating contractor becomes clearer and more manageable.
The South Carolina Heating Contractor Exam Prep process begins by choosing the correct license. For commercial heating work, South Carolina uses the Heating or HT classification under the Mechanical Contractor licensing system. This work can involve hot-water systems, steam, vapor, boilers, connected piping, ductwork, mechanical equipment, and necessary gas piping connected to covered gas-fired equipment. It is different from the Residential HVAC license and from the separate commercial Air Conditioning classification.
The South Carolina Contractors’ Licensing Board manages the contractor licensing requirements. PSI gives the Heating examination. The current technical exam has 50 questions and allows three hours. To pass, you need at least 35 correct answers, which is 70 percent. The test is open book, so you may use approved references under the current PSI rules. But you cannot assume that any edition, loose note, temporary tab, or book marking is allowed.
There are nine official Heating exam topic groups. Code Compliance has eight questions. HARV General has four, HARV Controls has four, and HARV Load Calculation has seven. Fuel Gas Systems has six, Piping has six, Ducts has three, Low-Pressure Boilers has seven, and High-Pressure Boilers has five. Together, these groups make up all 50 scored questions. Use those counts to guide your time while still reviewing every subject.
Your study materials should cover mechanical code, fuel gas rules, heating-system operation, boiler safety, ducts, piping, and load calculations. The PSI bulletin lists specific code editions and technical reference books. These include mechanical and fuel gas codes with South Carolina modifications or named state-code alternatives, boiler books, Manual J, Manual N, a Ductulator, piping references, and wider HVAC textbooks. Always check current approved editions before purchasing or taking materials to a test.
Studying for an open-book exam means practicing two skills at once. First, learn the actual heating ideas. Understand what a boiler safety device does, why combustion air matters, how a gas piping table is used, and how building heat loss changes equipment size. Second, learn how to find the controlling answer in the correct reference. A question is much easier when you already know which book and chapter to open.
South Carolina Heating candidates also need to pass the separate Business Management and Law exam. That examination contains 50 questions and lasts 125 minutes. You need 35 correct answers to pass. The topics include estimating, bidding, contracts, project management, insurance, labor laws, financial management, taxes, liens, and other responsibilities of a commercial contractor. It is not the same exam as the Heating technical test.
After passing the examinations, applicants still have to satisfy licensing requirements. The Board may require qualifying-party certification, work-experience records, application documents, business information, fees, and financial proof or a surety bond. Mechanical Contractor licenses use five financial groups. Their job limits are $35,000, $100,000, $200,000, $400,000, and unlimited. Each group has a separate financial threshold or bonding alternative.
Contractor Exam Preps sells a South Carolina Heating Contractor Complete Book Package, Heating pre-printed reference tabs, and Commercial Business and Law study materials. The Heating book package gathers many useful technical references, while the tab product helps with navigating books you already own. The business preparation package supports the required separate test. Check exactly what each product includes and compare the books with the current PSI reference list.
A six-week study schedule can make the process easier. Begin with licensing requirements and the mechanical code. Move into fuel gas and combustion, then load calculations and controls. Study piping and ducts before spending extra time on boilers. In the final week, practice mixed questions with a three-hour timer. Review slow book lookups and gather identification and application paperwork. Small, repeated study sessions are usually more helpful than one giant late-night session.
The main lesson is simple: select Heating HT when it fits your work, study the official PSI outline, prepare for both required exams, and finish the licensing paperwork carefully. A good reference library, regular timed practice, and an organized application can help turn a complicated-looking process into a manageable series of steps.
