Oklahoma HVACR Limited Contractor Highlighted & Tabbed Book Package

Prepare for the Oklahoma HVACR Limited Contractor examination with an organized collection of highlighted and tabbed HVACR reference materials built around the technical subjects covered on the state contractor exam. This package gives candidates a convenient way to study with important mechanical code, fuel gas, refrigeration, residential load calculation, trade mathematics, air distribution, and OSHA safety resources in one package.

The Oklahoma HVACR Limited Contractor exam requires candidates to work across several areas of mechanical trade knowledge, including refrigeration and air conditioning systems, heating systems, natural gas, air distribution, electrical knowledge and controls, and workplace safety. Because the examination is open book, effective preparation includes both understanding HVACR concepts and becoming comfortable navigating the references used during testing.

This package includes a Ductulator, International Mechanical Code, 2018, International Fuel Gas Code, 2018, Modern Refrigeration and Air Conditioning, 22nd Edition, Manual J - Residential Load Calcs, reprinted 2016, Eighth Full Edition, Mathematics for Plumbers and Pipefitters, 8th Edition, and Code of Federal Regulations - 29 CFR Part 1926 (OSHA).

The books are supplied highlighted and tabbed to support faster navigation during study. Instead of beginning with completely unorganized references, candidates can focus on learning how chapters, sections, tables, formulas, and technical subjects are arranged while building a repeatable exam-preparation routine.

Please allow up to 15 business days for highlighted and tabbed book package orders.

Exam Details

The Oklahoma HVACR Contractor, Limited examination is administered by PSI for candidates approved through the Oklahoma Construction Industries Board. The exam evaluates technical knowledge associated with installing, maintaining, repairing, fabricating, altering, and extending air conditioning, refrigeration, heating, and ventilation systems within the limited contractor classification.

• Exam: Oklahoma HVACR Contractor, Limited
• Testing Provider: PSI
• Number of Questions: 80
• Time Allowed: 210 minutes
• Passing Score: 70%
• Passing Raw Score: 56 correct answers
• Exam Format: Open book

The examination is divided into six major technical areas. Electrical Knowledge and Controls contains 15 questions. Natural Gas contains 12 questions. Air Distribution Systems contains 15 questions. Refrigeration and Air Conditioning Systems contains 20 questions. Heating Systems contains 15 questions, and Safety contains 3 questions.

Refrigeration and Air Conditioning Systems is the largest individual section. Topics include refrigeration theory, refrigerants, equipment sizing and design, components, piping, equipment installation, system operation, troubleshooting, and maintenance.

Heating Systems includes heating theory and types, combustion air, vents and chimneys, equipment sizing, heating equipment, installation, system operation, troubleshooting, maintenance, hydronics, and hydronic piping.

Air Distribution Systems includes duct definitions, sizing and design, duct assembly and installation, hangers and supports, duct materials and shapes, insulation, fire and smoke control, hoods and exhaust systems, testing and balancing, ventilation requirements, plans, and symbols.

Natural Gas questions address piping valves, connectors, accessories, hangers and supports, sizing, materials, and testing. Electrical Knowledge and Controls covers general electrical theory, motors, DC circuits, AC circuits, and controls. Safety topics include personal protective equipment, employee safety training, ventilation, first aid, fall protection, lockout/tagout, ladders, scaffolds, and related construction safety subjects.

Open Book Test

The Oklahoma HVACR Contractor, Limited examination is an open book test. Candidates are responsible for bringing approved references to the examination center and must follow PSI rules governing the condition and preparation of those materials.

Reference materials may be highlighted, underlined, and indexed before the examination. Permanent tabs are permitted. Temporary tabs such as Post-it notes are not allowed. Candidates may not write in their references before or during the examination session, and additional loose papers cannot be brought into the test room with the approved books.

This makes preparation with highlighted and tabbed references particularly useful. An open-book exam does not mean every answer can be found quickly without preparation. Candidates still need to identify which reference applies to a question, locate the correct section, and interpret the information within the available testing time.

Mechanical-system questions may direct you toward the International Mechanical Code. Fuel gas questions may require the International Fuel Gas Code. Refrigeration, heating, controls, and equipment questions may involve Modern Refrigeration and Air Conditioning. Residential load-calculation study can involve Manual J, while air-distribution work can involve the Ductulator. OSHA safety questions may require 29 CFR Part 1926.

PSI’s current examination bulletin identifies the 2018 editions of the International Mechanical Code and International Fuel Gas Code for code questions. Code examination questions are based on the specific code editions listed for the exam.

The current PSI bulletin also states that Modern Refrigeration and Air Conditioning, 22nd Edition becomes permitted beginning August 13, 2026. Candidates using the 22nd Edition should prepare according to the reference rules applying on their examination date.

Licensing Steps

The Oklahoma Construction Industries Board regulates mechanical contractor licensing. The contractor licensing process involves qualifying experience, application review, examination eligibility, contractor testing, and completion of active contractor requirements.

1. Gain qualifying mechanical trade experience. Build verifiable experience in the mechanical trade appropriate to the HVACR classification.
2. Meet contractor-level qualifications. Oklahoma requires mechanical contractor applicants to satisfy the applicable journeyman requirements and obtain an additional year of mechanical trade experience.
3. Submit the mechanical contractor application. Apply for the appropriate mechanical contractor classification through the Oklahoma Construction Industries Board.
4. Receive examination eligibility. The Construction Industries Board reviews applicant qualifications and determines eligibility to take the contractor examination.
5. Schedule testing through PSI. After approval, candidates arrange the applicable examination through PSI.
6. Complete the required contractor testing. Take the examinations required for the Oklahoma mechanical contractor license.
7. Complete active contractor requirements. Satisfy the applicable Oklahoma contractor requirements before operating under an active mechanical contractor license.

Preparing with the examination books before testing gives candidates time to learn where important information is located. Rather than treating each book as a reference to discover on exam day, use the materials regularly throughout your preparation.

State Requirements

The Oklahoma HVACR Limited Contractor classification establishes specific limits for the size of HVACR equipment that may be covered by the license.

An HVACR Limited Contractor may perform qualifying work involving cooling products, systems, or equipment, including process piping, with a cooling capacity of no more than 25 tons.

The classification also includes qualifying heating equipment and related process piping with a heat input of no more than 500,000 Btu/h per appliance.

The HVACR Limited classification also incorporates refrigeration, sheet metal, natural gas, and related process piping within the authorized scope of the license.

Oklahoma mechanical contractor applicants must satisfy the requirements applicable to a journeyman and have an additional year of experience in the mechanical trade. A mechanical contractor must also be a permanent employee, owner, partner, or officer of the mechanical firm.

Licensing involves more than passing the examination. Applicants should complete the applicable Construction Industries Board licensing process and meet the requirements associated with maintaining an active Oklahoma mechanical contractor license.

Reference Books

The Oklahoma HVACR Limited Contractor Highlighted & Tabbed Book Package includes the following technical references and study tools:

• Ductulator
  The ACCA Ductulator is a duct slide rule used for air-distribution calculations. It supports practice involving airflow, duct dimensions, velocity, friction, and duct-sizing relationships. Air Distribution Systems is a major portion of the Oklahoma HVACR Limited Contractor examination.
• International Mechanical Code, 2018
  Covers mechanical-system requirements involving ventilation, duct systems, exhaust, equipment installation, refrigeration systems, combustion air, chimneys, vents, and other mechanical installations. The 2018 edition is the code edition identified for the Oklahoma HVACR Contractor, Limited examination.
• International Fuel Gas Code, 2018
  Covers fuel gas piping systems, valves, connectors, sizing, materials, testing, combustion air, venting, appliances, and related fuel gas requirements. This reference supports preparation for Natural Gas and heating-related examination topics.
• Modern Refrigeration and Air Conditioning, 22nd Edition
  Provides comprehensive technical coverage of refrigeration theory, refrigerants, air conditioning, heating, electrical principles, motors, controls, system components, equipment installation, maintenance, troubleshooting, and HVACR service practices.
• Manual J - Residential Load Calcs, reprinted 2016, Eighth Full Edition
  Provides residential heating and cooling load-calculation material used to understand building heat gain, heat loss, design conditions, and HVAC equipment sizing concepts.
• Mathematics for Plumbers and Pipefitters, 8th Edition
  Provides trade-focused mathematical instruction involving measurements, formulas, conversions, area, volume, piping calculations, and other practical mathematics relevant to mechanical work.
• Code of Federal Regulations - 29 CFR Part 1926 (OSHA)
  Contains federal construction-industry safety standards. It supports preparation involving personal protective equipment, employee safety, fall protection, ladders, scaffolds, hazardous conditions, lockout/tagout, and other workplace safety requirements.

These references cover several different types of exam preparation. Code books are used for regulatory and installation requirements, HVACR textbooks support technical understanding, Manual J supports load-calculation study, the Ductulator assists with air-distribution work, the mathematics reference supports calculation skills, and OSHA regulations cover construction safety.

Test Information and Study Materials

A productive Oklahoma HVACR Limited Contractor study plan should combine technical review with repeated book navigation. Because the exam contains questions from several different HVACR areas, candidates should practice moving between references instead of studying each book in isolation.

Start with Refrigeration and Air Conditioning Systems, the largest examination category. Review refrigeration theory, refrigerants, system components, piping, installation, equipment sizing and design, operation, troubleshooting, and maintenance.

Give significant attention to Electrical Knowledge and Controls, Air Distribution Systems, and Heating Systems, which each contain 15 questions. Electrical preparation should include motors, AC and DC circuits, basic electrical theory, and HVACR controls. Air-distribution preparation should include duct sizing, duct design, installation, insulation, ventilation, exhaust systems, fire and smoke control, and system balancing.

Heating preparation should include combustion air, vents and chimneys, heating equipment, equipment sizing, hydronic systems, installation, operation, maintenance, and troubleshooting.

Natural Gas accounts for 12 questions. Review piping valves, connectors, accessories, supports, materials, testing, and sizing. Use the International Fuel Gas Code while studying these subjects so that code navigation becomes part of the learning process.

Safety contains fewer questions but should still be included in your preparation. Use 29 CFR Part 1926 to practice locating construction safety requirements involving PPE, fall protection, ladders, scaffolds, employee training, hazardous materials, first aid, ventilation, and lockout/tagout.

Use the highlighted and tabbed books actively. Pick a subject, identify the correct reference, and locate the relevant chapter or section. For example, practice finding mechanical ventilation requirements, fuel gas sizing provisions, refrigeration-system information, residential load-calculation material, or OSHA safety requirements.

Reference-navigation drills can be particularly useful for open-book preparation. Set a timer and give yourself a series of mixed questions. Before opening a book, determine which reference should contain the information. Then locate the answer efficiently. This helps develop both subject recognition and navigation habits.

The exam allows 210 minutes for 80 questions, so candidates must manage time carefully. Some questions may be answered directly from trade knowledge, while others may require calculations or reference research. Effective preparation helps candidates recognize when a book lookup is useful and which reference should be used first.

How 1 Exam Prep Helps You Reach Your Goal

1 Exam Prep supports Oklahoma HVACR Limited Contractor candidates through organized study guidance, trade-focused review, practice-oriented preparation, reference navigation, and confidence-building study structure.

Highlighted and tabbed references can make study sessions more organized by giving candidates a practical system for navigating mechanical codes, fuel gas requirements, refrigeration material, residential load calculations, mathematics, air distribution, and construction safety.

The most effective use of these books involves more than reading. Candidates should work directly with the references while solving practice questions, reviewing technical concepts, completing calculations, and studying code requirements. Repeated navigation helps develop familiarity with the structure of each book.

1 Exam Prep encourages candidates to organize study time according to the trade areas being tested. A candidate with strong refrigeration experience may need additional review in electrical controls, fuel gas, air distribution, calculations, or OSHA. Another candidate may understand mechanical installation well but need more practice navigating code books under time pressure.

Trade-focused preparation helps identify those differences and create a more structured study routine. By combining practical HVACR review with repeated reference navigation, candidates can develop stronger familiarity with the subjects and books associated with the Oklahoma HVACR Limited Contractor examination.

FAQ Section

What is included in the Oklahoma HVACR Limited Contractor Highlighted & Tabbed Book Package?

The package includes a Ductulator, International Mechanical Code 2018, International Fuel Gas Code 2018, Modern Refrigeration and Air Conditioning 22nd Edition, Manual J Eighth Full Edition, Mathematics for Plumbers and Pipefitters 8th Edition, and Code of Federal Regulations - 29 CFR Part 1926 OSHA.

Are the books highlighted and tabbed?

Yes. The books are highlighted and tabbed to provide an organized starting point for studying and reference navigation.

How long should I allow for my order?

Please allow up to 15 business days for highlighted and tabbed book package orders.

Is the Oklahoma HVACR Limited Contractor exam open book?

Yes. The Oklahoma HVACR Contractor, Limited examination is open book. Approved references may be brought into the examination center according to PSI testing rules.

How many questions are on the Oklahoma HVACR Limited Contractor exam?

The examination contains 80 questions. Candidates receive 210 minutes to complete the test.

What score is required to pass?

The passing score is 70 percent, which corresponds to 56 correct answers on the 80-question examination.

What subjects are tested?

The exam covers Electrical Knowledge and Controls, Natural Gas, Air Distribution Systems, Refrigeration and Air Conditioning Systems, Heating Systems, and Safety.

Can approved references be highlighted and tabbed?

PSI permits approved references to be highlighted, underlined, and indexed before the examination. Permanent tabs are allowed. Temporary tabs such as Post-it notes are not permitted.

What does the Oklahoma HVACR Limited Contractor classification cover?

The classification covers qualifying cooling equipment and systems up to 25 tons and heating equipment with heat input up to 500,000 Btu/h per appliance, along with refrigeration, sheet metal, natural gas, and related process piping within the authorized license scope.

Why is Manual J included?

Manual J provides residential heating and cooling load-calculation material and helps candidates study concepts related to system sizing, heat gain, heat loss, and equipment selection.

Why is a Ductulator included?

The Ductulator supports study of air-distribution and duct-sizing concepts, including airflow, duct dimensions, velocity, and friction relationships.

How should I study with highlighted and tabbed books?

Use the books with practice questions and technical review. Practice identifying the correct reference, navigating to the appropriate section, and locating information efficiently rather than relying on the tabs alone.