Oklahoma HVACR Unlimited Contractor Exam - Online Practice Questions

Oklahoma HVACR Unlimited Contractor Exam - Online Practice Questions

Prepare for the Oklahoma HVACR Unlimited Contractor Exam with online practice questions designed to help you review heating, ventilation, air conditioning, refrigeration, duct sizing, fuel gas, commercial load calculations, trade math, mechanical code, electrical controls, and OSHA construction safety topics before test day. This product is built for candidates who want focused, exam-style preparation for the PSI examination administered for the Oklahoma Construction Industries Board.

This product includes online practice question access only for 3 months. Physical books, printed references, application services, tutoring, and extended course access are not included with this product unless separately stated on the purchase page.

The Oklahoma HVACR Unlimited Contractor Exam is designed for candidates pursuing contractor-level licensing in the unlimited HVACR classification. This category covers installation, maintenance, repair, fabrication, alteration, or extension of air conditioning, refrigeration, heating, and ventilating systems, including ductwork within a complete system unlimited in horsepower or tons, along with related appurtenances, piping vessels, ducts, and insulation.

This online practice question product helps turn large technical references into active study. Instead of only reading the International Mechanical Code, International Fuel Gas Code, Modern Refrigeration and Air Conditioning, Manual N, Mathematics for Plumbers and Pipefitters, OSHA regulations, and the Ductulator, you can work through practice questions that reinforce important topics and help you recognize how exam concepts may be presented.

Practice questions are especially useful for open book exams because preparation is not only about memorizing facts. It is also about understanding where information is located, how the references are organized, and which book or tool is most useful for a specific type of question. This product gives you a structured way to review HVACR Unlimited Contractor exam topics during your 3-month access period.

What You Get

• Online Practice Questions: Practice questions focused on Oklahoma HVACR Unlimited Contractor Exam preparation.
• 3 Month Access Only: This product includes access to the online practice questions for 3 months.
• HVACR Trade Review: Practice connected to heating, ventilation, air conditioning, refrigeration, duct systems, controls, equipment, system operation, maintenance, and troubleshooting.
• Mechanical Code Review: Study support connected to the International Mechanical Code, 2018 edition, including equipment installation, ventilation, duct systems, exhaust, combustion air, and mechanical requirements.
• Fuel Gas Review: Practice connected to the International Fuel Gas Code, 2018 edition, including gas piping, fuel gas appliances, venting, combustion air, regulators, valves, materials, testing, and safety requirements.
• Manual N and Ductulator Support: Review that helps reinforce commercial load calculation concepts, airflow, duct sizing, friction loss, velocity, and system design basics.
• Math and Safety Practice: Questions connected to trade math, measurements, calculations, OSHA construction safety, lockout/tagout, fall protection, ladders, scaffolds, and jobsite responsibilities.
• Flexible Online Study: Use the practice questions for first-time review, repeated reinforcement, or final exam preparation during your 3-month access period.

Exam Details

The Oklahoma HVACR Unlimited Contractor Exam is administered by PSI for the Oklahoma Construction Industries Board. Candidates must be approved by the State of Oklahoma before scheduling the examination. Once approved, candidates are responsible for scheduling their exam appointment with PSI.

The HVACR Unlimited Contractor examination contains 90 scored items. Candidates are allowed 240 minutes to complete the exam, and the listed passing score is 70% correct, which is 63 correct answers out of 90 scored items. The examination is computer-based and is taken through an approved PSI testing location.

The exam is designed to evaluate knowledge needed for unlimited HVACR contractor work. Preparation should include electrical knowledge and controls, natural gas, air distribution systems, refrigeration and air conditioning systems, heating systems, and safety. Because the unlimited license classification is broader than the limited category, candidates should prepare for questions involving complete HVACR systems that are not restricted by horsepower or tons.

Electrical knowledge and controls topics include general electrical theory and knowledge, motors, direct current circuits, alternating current circuits, and controls. Natural gas topics include piping valves, connectors, accessories, hangers and supports, sizing, materials, and testing. Air distribution systems include duct definitions, sizing and design, duct assembly and installation, hangers and supports, duct materials and shapes, duct insulation, fire and smoke control, hoods and exhaust systems, testing and balancing, ventilation requirements, plans, and symbols.

Refrigeration and air conditioning systems include theory, refrigerants, equipment sizing and design, equipment and components, piping, equipment installation, system operation, troubleshooting, and maintenance. Heating systems include heating theory and types, combustion air, vents and chimneys, equipment sizing, heating equipment, equipment installation, system operation, troubleshooting, maintenance, hydronics, and hydronic piping. Safety topics include personal protective equipment, safety training, adequate ventilation, first aid kits, material safety data sheets, toxic materials, fall protection, lockout/tagout, ladders, and scaffolds.

Open Book Test

The Oklahoma HVACR Unlimited Contractor Exam is an open book test. Candidates are responsible for bringing their own approved references to the examination center. For code questions, the examination is based on the specific code editions listed for the exam.

Reference materials may be highlighted, underlined, and indexed before the examination session. References may not be written in before or during the examination. Candidates may use permanent tabs only. Temporary tabs, including Post-it style notes, are not allowed and must be removed before the exam begins. Candidates may not bring additional loose papers with approved references.

For downloaded references, the material must be spiral bound, hole-punched and placed in a binder, or stapled in the left-hand corner. Candidates may use a silent, non-printing, non-programmable calculator in the examination center, and a magnifying glass may be provided upon request.

Because this is an open book examination, preparation should include reference navigation. Candidates should practice locating information in the Ductulator, International Mechanical Code, International Fuel Gas Code, Modern Refrigeration and Air Conditioning, Manual N, Mathematics for Plumbers and Pipefitters, and OSHA 29 CFR Part 1926. Knowing the subject is helpful, but knowing where to find the answer during a timed exam is also important.

Licensing Steps

Oklahoma HVACR contractor licensing is handled through the Oklahoma Construction Industries Board. Candidates applying for an HVACR Unlimited Contractor license must meet the state’s eligibility requirements, submit the required application materials, receive approval to test, schedule the required examination through PSI, and complete the remaining licensing requirements after passing.

The licensing process begins with confirming that the applicant is pursuing the correct mechanical contractor category. HVACR Unlimited Contractor licensing is different from HVACR Limited Contractor licensing, HVACR journeyman licensing, refrigeration licensing, process piping, sheet metal, and natural gas piping categories. Candidates should match the license category to the type of work they intend to perform before applying.

After confirming the correct category, the applicant submits the required application and supporting documentation to the Oklahoma Construction Industries Board. The Board reviews the application and determines whether the candidate is eligible for examination. Once approved, the candidate schedules the PSI examination and prepares using the listed references.

Passing the HVACR Unlimited Contractor exam is an important licensing step, but contractor-level licensing also includes ongoing compliance responsibilities. Contractors must understand the scope of their license, work within Oklahoma mechanical licensing rules, maintain required business and compliance documentation, and follow applicable mechanical, fuel gas, refrigeration, piping, ventilation, and safety requirements.

After licensure, an HVACR Unlimited Contractor should keep licensing records, insurance documents, workers’ compensation compliance documentation when applicable, and renewal information current. Contractor-level authority involves more than trade knowledge. It also includes responsibility for safe, code-compliant, professional work in residential, commercial, and industrial HVACR environments.

State Requirements

Oklahoma mechanical contractor licensing is regulated by the Oklahoma Construction Industries Board. HVACR Unlimited Contractor licensing is one of the mechanical contractor classifications recognized by the state.

An HVACR Unlimited Contractor license entitles the licensee to install, alter, modify, service, maintain, or repair any cooling product, system, or equipment, including process piping, and heating equipment, including process piping. The license also covers sheet metal, natural gas piping, and refrigeration within the scope of the Oklahoma HVACR Unlimited Contractor classification.

Candidates must be approved by the State of Oklahoma before they can schedule the PSI examination. Applicants should prepare complete application materials and supporting documentation before submitting their application to the Oklahoma Construction Industries Board. Missing or incomplete documentation can delay eligibility review.

The HVACR Unlimited Contractor license is different from an HVACR Unlimited Journeyman license. The contractor license is tied to contractor-level authority and responsibility, while a journeyman license is tied to performing HVACR work while employed by a properly licensed contractor. Candidates should review current Oklahoma Construction Industries Board application materials so they understand the documentation, examination, licensing, and work-scope requirements for the correct category.

HVACR Unlimited Contractor candidates should understand the relationship between mechanical code requirements, fuel gas requirements, refrigeration principles, air distribution, commercial load calculations, heating systems, hydronics, electrical controls, equipment installation, system troubleshooting, and OSHA safety. These areas affect both exam preparation and professional work in the field.

Reference Books

• Ductulator
  A duct slide rule reference used for duct sizing, airflow relationships, friction loss, velocity, and practical HVAC duct design calculations.
• International Mechanical Code, 2018 Edition
  A mechanical code reference used for HVAC systems, ventilation, duct systems, exhaust, appliance installation, combustion air, mechanical equipment, refrigeration-related provisions, and related code requirements. Oklahoma revisions may apply where listed for the exam.
• International Fuel Gas Code, 2018 Edition
  A fuel gas code reference used for gas piping, fuel gas appliances, combustion air, venting, regulators, valves, testing, inspection, materials, and fuel gas system safety requirements. Oklahoma revisions may apply where listed for the exam.
• Modern Refrigeration and Air Conditioning, 22nd Edition
  A refrigeration and air conditioning reference covering HVACR theory, refrigeration cycles, system components, equipment operation, installation, service, troubleshooting, controls, and practical trade knowledge.
• Manual N - Commercial Load Calculation for Small Commercial Buildings, 5th Edition
  A commercial load calculation reference used for small commercial heating and cooling load concepts, equipment sizing considerations, building conditions, internal loads, ventilation loads, and commercial HVAC design support.
• Mathematics for Plumbers and Pipefitters, 8th Edition
  A trade math reference used for measurements, formulas, conversions, offsets, geometry, material calculations, and applied math used in mechanical and piping work.
• Code of Federal Regulations - 29 CFR Part 1926 (OSHA)
  Construction safety regulations used for jobsite safety topics, including personal protective equipment, ladders, scaffolds, fall protection, excavation safety, ventilation, tools, equipment, signs, signals, barricades, toxic materials, and material safety responsibilities.

Exam Room Approved Books

• ACCA Ductulator
  Allowed in the exam room for duct sizing, airflow, velocity, and friction loss reference use.
• International Mechanical Code, 2018 Edition, with Oklahoma Revisions
  Allowed in the exam room for mechanical code questions. For code questions, the exam is based on the listed code edition.
• International Fuel Gas Code, 2018 Edition, with Oklahoma Revisions
  Allowed in the exam room for fuel gas code questions involving gas piping, appliances, combustion air, venting, regulators, valves, materials, testing, and inspection.
• Modern Refrigeration and Air Conditioning, 22nd Edition
  Allowed HVACR reference for refrigeration principles, air conditioning systems, equipment, controls, service, installation, and troubleshooting topics.
• Manual N - Commercial Load Calculation for Small Commercial Buildings, 5th Edition
  Allowed commercial load calculation reference for small commercial HVAC sizing, design conditions, equipment sizing, and load calculation concepts.
• Mathematics for Plumbers and Pipefitters, 8th Edition
  Allowed trade math reference for measurements, formulas, conversions, geometry, offsets, and applied mechanical calculations.
• Code of Federal Regulations - 29 CFR Part 1926 (OSHA), with latest available amendments
  Allowed in the exam room for construction safety topics. Candidates may also use Code of Federal Regulations - 29 CFR Part 1926 Selections by PSI with latest available amendments.

Test Information and Study Materials

The Oklahoma HVACR Unlimited Contractor Exam should be approached with a study plan that combines HVACR trade knowledge, mechanical code review, fuel gas code review, refrigeration theory, electrical controls, duct sizing, commercial load calculation concepts, hydronics, trade math, and OSHA safety preparation. The exam contains 90 scored questions, so candidates should be able to move efficiently between the question, the correct reference, and the answer.

Electrical knowledge and controls should be reviewed carefully. Candidates should study general electrical theory, motors, direct current circuits, alternating current circuits, and controls. HVACR systems depend on electrical components and control circuits, so candidates should understand how motors, controls, switches, relays, thermostats, safety controls, and electrical fundamentals apply to equipment operation and troubleshooting.

The International Mechanical Code should be reviewed for mechanical system requirements, ventilation, exhaust, duct systems, equipment installation, combustion air coordination, appliance clearances, refrigeration-related provisions, and mechanical safety requirements. Candidates should understand how the code is organized and where common HVACR topics are located.

The International Fuel Gas Code should be reviewed for natural gas piping, gas appliances, combustion air, venting, regulators, valves, connectors, accessories, hangers and supports, sizing, materials, and testing. HVACR work often connects directly to fuel gas appliances and venting systems, so candidates should be comfortable identifying when a question belongs in the fuel gas reference instead of the mechanical code.

Modern Refrigeration and Air Conditioning should be used to review refrigeration cycles, refrigerants, compressors, condensers, evaporators, metering devices, controls, heat transfer, air conditioning systems, heating systems, troubleshooting, installation practices, and service procedures. This reference supports trade knowledge that may not be answered directly by a code book.

Manual N should be reviewed for small commercial load calculation concepts. Candidates should understand the purpose of commercial load calculations, the effect of building envelope conditions, internal loads, occupancy, lighting, ventilation, design conditions, and equipment sizing considerations. Commercial load calculation questions may require careful reading because assumptions and building conditions affect the correct approach.

The Ductulator should be used for duct sizing, airflow, velocity, and friction loss review. Candidates should practice using the tool before exam day so they are comfortable reading it quickly. Air distribution system topics also include duct definitions, sizing and design, duct assembly and installation, hangers and supports, duct materials and shapes, duct insulation, fire and smoke control, hoods and exhaust systems, testing and balancing, ventilation requirements, plans, and symbols.

Heating system topics include heating theory and types, combustion air, vents and chimneys, equipment sizing, heating equipment, equipment installation, system operation, troubleshooting, maintenance, hydronics, and hydronic piping. Candidates should understand both fuel-fired and hydronic heating concepts, along with code requirements that affect appliance installation and safe operation.

Mathematics for Plumbers and Pipefitters should be used to review applied trade math. Candidates should be comfortable with measurements, conversions, formulas, basic geometry, offsets, and calculations used in mechanical work. A solid math foundation can help with duct sizing, load calculation support, piping layout, hydronic work, measurement, and practical field questions.

OSHA 29 CFR Part 1926 should be reviewed for construction safety. Candidates should study personal protective equipment, safety training, ventilation, first aid kits, material safety data sheets, toxic materials, fall protection, lockout/tagout, ladders, scaffolds, tools, equipment, signs, signals, barricades, materials, and jobsite responsibilities. HVACR work can involve rooftops, ladders, mechanical rooms, confined or limited spaces, electrical hazards, gas-fired appliances, refrigerants, hydronic piping, and construction environments, so safety knowledge is an important part of preparation.

Because the exam is open book, candidates should prepare their references according to the testing rules. Highlighting, underlining, and permanent tabs can help organize important sections, but references may not contain written notes. Candidates should practice using the references repeatedly so they can locate material quickly during the timed exam.

Online practice questions help turn code, standards, calculations, and safety material into active review. As you answer questions, identify the subject being tested, review why the answer is correct, and connect the question back to the proper reference. During your 3-month access period, repeated practice can help reinforce topic recognition, reference navigation, and confidence with HVACR Unlimited Contractor exam content.

How 1 Exam Prep Helps You Reach Your Goal

1 Exam Prep helps students prepare for contractor licensing exams with organized, trade-focused study tools. For the Oklahoma HVACR Unlimited Contractor Exam, these online practice questions support review of mechanical code topics, fuel gas requirements, refrigeration principles, electrical controls, air distribution, duct sizing, commercial load calculations, heating systems, hydronics, trade math, equipment installation, system operation, troubleshooting, and OSHA construction safety.

Because the exam is open book, 1 Exam Prep emphasizes reference familiarity when applicable. Practice questions help you recognize whether a topic is more likely connected to the Ductulator, International Mechanical Code, International Fuel Gas Code, Modern Refrigeration and Air Conditioning, Manual N, Mathematics for Plumbers and Pipefitters, or OSHA 29 CFR Part 1926. This helps build a stronger study structure for exam day and supports more efficient use of approved references.

1 Exam Prep also helps students focus on realistic preparation. The practice format encourages repetition, review, and better time management. As you work through questions, you can identify weak areas, revisit difficult topics, and strengthen your understanding of HVACR concepts in an exam-style setting.

This product does not guarantee a passing score, licensing approval, or a specific exam outcome. It provides practical preparation support for candidates who want a more organized way to study for the Oklahoma HVACR Unlimited Contractor Exam during their 3-month access period.

FAQ Section

Is this product for the Oklahoma HVACR Unlimited Contractor Exam?

Yes. This product is designed for candidates preparing for the Oklahoma HVACR Unlimited Contractor Exam with online practice questions.

How long do I get access to the online practice questions?

You get 3 months of access only to the Oklahoma HVACR Unlimited Contractor Exam online practice questions.

Does this product include access longer than 3 months?

No. This product includes 3 months of online practice question access only.

How many questions are on the Oklahoma HVACR Unlimited Contractor Exam?

The exam contains 90 scored items.

How much time is allowed for the exam?

Candidates are allowed 240 minutes to complete the examination.

What score is required to pass?

The listed passing score is 70% correct, which is 63 correct answers out of 90 scored items.

Is the Oklahoma HVACR Unlimited Contractor Exam open book?

Yes. The exam is open book. Candidates must bring their own approved references and follow the examination center rules for highlighting, underlining, indexing, permanent tabs, and written notes.

What references are used for this exam?

The listed references include the Ductulator, International Mechanical Code 2018, International Fuel Gas Code 2018, Modern Refrigeration and Air Conditioning 22nd Edition, Manual N Commercial Load Calculation for Small Commercial Buildings 5th Edition, Mathematics for Plumbers and Pipefitters 8th Edition, and Code of Federal Regulations - 29 CFR Part 1926 OSHA material.

Does this product include the reference books?

No. This product is for online practice questions only. Physical reference books are not included unless separately stated on the product purchase page.

What topics should I study for the exam?

Important study areas include electrical knowledge and controls, natural gas, air distribution systems, refrigeration and air conditioning systems, heating systems, commercial load calculations, hydronics, trade math, and OSHA construction safety.

Can I use tabs in my books?

Yes. Approved references may be indexed with permanent tabs. Temporary tabs, such as Post-it notes, are not allowed.

Can I use a calculator during the exam?

Yes. Candidates may use a silent, non-printing, non-programmable calculator in the examination center.

Is the HVACR Unlimited Contractor license the same as an HVACR Unlimited Journeyman license?

No. A contractor license is tied to contractor-level authority and responsibility, while a journeyman license is tied to performing qualified HVACR work within the authorized scope while working under the proper contractor category.

What type of work does the HVACR Unlimited Contractor license cover?

The HVACR Unlimited Contractor license covers unlimited HVACR work involving air conditioning, refrigeration, heating, ventilation, ductwork, related appurtenances, piping vessels, ducts, and insulation within the scope of Oklahoma mechanical licensing rules.

Who approves candidates for the exam?

The Oklahoma Construction Industries Board determines eligibility for examination before candidates schedule with PSI.

Who administers the exam?

PSI administers Oklahoma mechanical licensing examinations for the Oklahoma Construction Industries Board.