Oklahoma HVACR Unlimited Contractor - Book Rental Package

Prepare for the Oklahoma HVACR Unlimited Contractor examination with a comprehensive book rental package that combines technical HVACR references, Oklahoma contractor laws and regulations, business and law materials, commercial load-calculation resources, trade mathematics, and construction safety standards.

The Oklahoma HVACR Unlimited Contractor - Book Rental Package is designed for candidates pursuing Oklahoma's unrestricted HVACR contractor classification. The package includes materials for both technical trade preparation and contractor business and law study, giving candidates access to the references needed to work through HVACR systems, mechanical codes, fuel gas requirements, commercial load calculations, air distribution, contractor regulations, lien law, workers’ compensation, business management, and safety.

All included rental books are highlighted and tabbed to support organized study and reference navigation. Since the Oklahoma HVACR Contractor Unlimited examination is open book, becoming familiar with the layout of the references can be an important part of preparation. Working with the books before test day helps candidates practice locating chapters, tables, formulas, definitions, code sections, and technical information more efficiently.

Please allow up to 15 business days for book rental package orders.

Exam Details

The Oklahoma HVACR Contractor Unlimited examination tests knowledge associated with installing, maintaining, repairing, fabricating, altering, and extending air conditioning, refrigeration, heating, and ventilation systems, including ductwork within complete HVACR systems. The unlimited classification is not restricted by the equipment-capacity limits that apply to Oklahoma's HVACR Limited Contractor classification.

• Exam: Oklahoma HVACR Contractor Unlimited
• Testing Provider: PSI
• Number of Questions: 90
• Time Allowed: 240 minutes
• Passing Score: 70%
• Passing Raw Score: 63 correct answers
• Exam Format: Open book

The technical examination contains 15 questions in Electrical Knowledge and Controls, 12 questions in Natural Gas, 25 questions in Air Distribution Systems, 20 questions in Refrigeration and Air Conditioning Systems, 15 questions in Heating Systems, and 3 questions in Safety.

Electrical Knowledge and Controls includes electrical theory, motors, DC circuits, AC circuits, and controls. Natural Gas covers piping valves, connectors, accessories, hangers and supports, sizing, materials, and testing.

Air Distribution Systems is the largest technical section of the examination. Topics include duct definitions, sizing and design, duct assembly and installation, hangers and supports, materials and shapes, insulation, fire and smoke control, hoods and exhaust systems, testing and balancing, ventilation requirements, plans, and symbols.

Refrigeration and Air Conditioning Systems includes refrigeration theory, refrigerants, equipment sizing and design, equipment and components, piping, installation, system operation, troubleshooting, and maintenance. Heating Systems includes heating theory, combustion air, vents and chimneys, equipment sizing, heating equipment, installation, hydronics, operation, maintenance, and troubleshooting.

Mechanical contractor licensing also includes a Business and Law examination component covering areas such as bidding and estimating, project management, contracts, financial management, labor and personnel, risk management, licensing requirements, liens, and contractor responsibilities.

Open Book Test

The Oklahoma HVACR Contractor Unlimited examination is an open book test. Approved reference materials may be brought into the examination center according to PSI exam-room rules.

Approved references may be highlighted, underlined, and indexed before testing. Permanent tabs are permitted. Temporary tabs such as Post-it notes are not allowed, and references may not contain written notes. Candidates may not write in the references during the examination session.

This makes organized reference preparation especially useful. Open book does not mean every question should be researched from the beginning. Candidates still need to recognize the subject, identify the appropriate reference, and locate the relevant information efficiently.

Mechanical installation and ventilation questions may require the International Mechanical Code. Natural gas piping, sizing, combustion air, appliances, or venting questions may require the International Fuel Gas Code. Commercial load-calculation questions may involve Manual N, while duct-sizing work may involve the Ductulator.

Modern Refrigeration and Air Conditioning supports broader HVACR technical review, including refrigeration, heating, air conditioning, electrical concepts, controls, system components, installation, maintenance, and troubleshooting. Mathematics for Plumbers and Pipefitters supports trade calculations, while 29 CFR Part 1926 supports construction safety preparation.

Modern Refrigeration and Air Conditioning, 22nd Edition is permitted for exam-room use beginning August 13, 2026.

Licensing Steps

1. Gain qualifying mechanical experience. Build verifiable HVACR trade experience appropriate to the unlimited contractor classification.
2. Meet contractor qualifications. Oklahoma contractor applicants must satisfy the applicable journeyman qualifications and obtain an additional year of mechanical trade experience.
3. Demonstrate unlimited-level HVACR experience. Qualifying experience for the unlimited classification must support work beyond the capacity limitations associated with the HVACR Limited classification.
4. Submit the contractor application. Apply through the Oklahoma Construction Industries Board for the HVACR Unlimited Contractor classification.
5. Receive approval to test. The Construction Industries Board determines examination eligibility.
6. Schedule the examinations. Once approved, candidates schedule the required testing through PSI.
7. Pass the technical and Business and Law requirements. Oklahoma mechanical contractor licensing requires completion of both examination components.
8. Complete active contractor requirements. After passing the required examinations, complete the applicable bond, insurance, and licensing requirements for active contractor status.

The book rental package supports preparation for both the technical and business sides of the licensing process by providing HVACR references along with Oklahoma statutes, administrative rules, lien law, workers’ compensation material, and contractor business resources.

State Requirements

The Oklahoma HVACR Unlimited Contractor classification authorizes qualifying work involving cooling products, systems, and equipment, including process piping, without the tonnage restriction that applies to the HVACR Limited classification.

The unlimited classification also covers heating equipment and process piping without the heating-input capacity restriction applied to the limited category. Qualifying sheet metal, natural gas piping, refrigeration, and related work are also included within the HVACR Unlimited Contractor scope.

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

After the examination requirements are completed, the contractor must satisfy Oklahoma requirements for active contractor status, including applicable bond and liability insurance requirements.

The licensing process therefore involves more than passing the exam. Experience, application approval, technical knowledge, business and law preparation, and active-license requirements all play a role in becoming an Oklahoma HVACR Unlimited Contractor.

Reference Books

• Included Rental Book: Ductulator
  A practical air-distribution tool used for duct-sizing work involving airflow, duct dimensions, velocity, and friction relationships.
• Included Rental Book: International Mechanical Code, 2018
  Covers mechanical equipment, ventilation, duct systems, exhaust, combustion air, refrigeration systems, chimneys, vents, and related mechanical installation requirements.
• Included Rental Book: International Fuel Gas Code, 2018
  Covers fuel gas piping, sizing, materials, installation, connectors, appliances, testing, combustion air, venting, and related requirements.
• Included Rental Book: Modern Refrigeration and Air Conditioning, 22nd Edition
  Provides extensive HVACR technical coverage involving refrigeration theory, refrigerants, air conditioning, heating, electrical concepts, controls, equipment, installation, maintenance, system operation, service, and troubleshooting.
• Included Rental Book: Manual N - Commercial Load Calculation for Small Commercial Buildings, 5th Edition
  Supports study of commercial heating and cooling load calculations and equipment-sizing concepts for small commercial buildings.
• Included Rental Book: Mathematics for Plumbers and Pipefitters, 8th Edition
  Supports practical trade calculations involving measurements, formulas, conversions, area, volume, piping, and related mechanical mathematics.
• Included Rental Book: Code of Federal Regulations - 29 CFR Part 1926 (OSHA)
  Contains federal construction-industry safety requirements covering workplace hazards, personal protective equipment, fall protection, ladders, scaffolds, and related safety subjects.
• Included Rental Book: Oklahoma Mechanical Licensing Act, Oklahoma Statutes, Title 59, Chapter 43A
  Provides statutory material relating to Oklahoma mechanical licensing and contractor responsibilities.
• Included Rental Book: Oklahoma Mechanical Industry Regulations, Oklahoma Administrative Code, Title 158, Chapter 50
  Contains administrative regulations governing Oklahoma mechanical licensing, contractors, and industry compliance.
• Included Rental Book: Oklahoma Fine Schedule of the Construction Industries Board, Oklahoma Administrative Code, Title 158, Chapter 10
  Provides information concerning administrative penalties associated with Construction Industries Board requirements.
• Included Rental Book: Oklahoma Lien Law, Oklahoma Statutes, Title 42, Chapter 3
  Covers Oklahoma lien provisions relevant to contractors, construction projects, and payment rights.
• Included Rental Book: NASCLA Contractors Guide to Business, Law and Project Management, 14th Edition
  Covers contractor-focused business topics including estimating, contracts, project management, financial management, labor, risk, business operations, and related responsibilities.
• Included Rental Book: Oklahoma Workers’ Compensation Act, Oklahoma Statutes, Title 85A, Chapter 1
  Provides Oklahoma statutory material relating to workers’ compensation and employer responsibilities.

Exam Room Approved Books

The technical examination reference list includes the Ductulator, International Mechanical Code 2018, International Fuel Gas Code 2018, Modern Refrigeration and Air Conditioning, Manual N, Mathematics for Plumbers and Pipefitters, and 29 CFR Part 1926 OSHA.

The Business and Law reference materials include Oklahoma mechanical licensing statutes and regulations, the Construction Industries Board fine schedule, Oklahoma lien law, the NASCLA Contractors Guide to Business, Law and Project Management, and Oklahoma workers’ compensation material.

Modern Refrigeration and Air Conditioning, 22nd Edition becomes permitted for the examination on August 13, 2026. The 2018 International Mechanical Code and 2018 International Fuel Gas Code remain the specified code editions for applicable code questions.

Use the highlighted and tabbed rental books throughout preparation so the organization of each reference becomes familiar. Tabs can help direct you to key sections, but candidates should also understand the material and practice selecting the correct book for each type of question.

Test Information and Study Materials

A strong Oklahoma HVACR Unlimited Contractor study plan should combine technical HVACR review, commercial load calculations, code navigation, trade mathematics, construction safety, and contractor business preparation.

Air Distribution Systems deserves significant attention because it represents the largest technical exam category. Review duct sizing and design, assembly and installation, supports, materials, insulation, ventilation, exhaust systems, fire and smoke control, testing and balancing, and plans and symbols. Practice using the Ductulator along with applicable mechanical-code requirements.

For Refrigeration and Air Conditioning Systems, study refrigeration theory, refrigerants, system components, piping, equipment sizing and design, installation, operation, troubleshooting, and maintenance. Use Modern Refrigeration and Air Conditioning throughout preparation so technical study and reference navigation develop together.

Heating preparation should address combustion air, vents and chimneys, equipment sizing, heating equipment, installation, hydronic systems, operation, maintenance, and troubleshooting. Natural gas study should include piping, valves, connectors, supports, sizing, materials, and testing.

Manual N should be incorporated into commercial load-calculation practice. Candidates pursuing the unlimited classification should be comfortable with commercial HVAC concepts because the license is not restricted to systems within the limited-category capacity thresholds.

Safety study should include direct navigation of 29 CFR Part 1926. Business and law preparation should include contractor licensing requirements, bidding and estimating, project management, contracts, lien law, financial management, workers’ compensation, and Oklahoma administrative requirements.

Mixed-reference practice can help simulate the demands of contractor testing. Work through questions from different categories during the same study session, and identify the correct reference before beginning a lookup. Repeated practice can help build familiarity with the books and improve the organization of your study process.

How 1 Exam Prep Helps You Reach Your Goal

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

The highlighted and tabbed rental books provide candidates with an organized collection of technical and business references for studying mechanical codes, fuel gas systems, refrigeration, heating, commercial load calculations, duct design, mathematics, OSHA safety, Oklahoma contractor laws, and business management.

Working with the books throughout your preparation helps connect technical knowledge with the source material used for open-book testing. Candidates can practice locating code provisions, tables, formulas, definitions, load-calculation material, safety requirements, and contractor regulations instead of seeing the references for the first time on exam day.

1 Exam Prep encourages candidates to identify areas that require additional review and develop a study routine around those needs. An experienced HVACR professional may be comfortable with refrigeration and equipment installation but need more practice with commercial load calculations, business law, code navigation, or contractor regulations.

The goal is to help candidates approach Oklahoma HVACR Unlimited Contractor preparation with an organized plan, stronger familiarity with their reference materials, and confidence built through consistent study and practice without guaranteeing examination or licensing outcomes.

FAQ Section

What is included in the Oklahoma HVACR Unlimited Contractor Book Rental Package?

The package includes the listed HVACR technical references, Ductulator, Manual N, mechanical and fuel gas codes, OSHA material, Oklahoma mechanical laws and regulations, lien law, workers’ compensation material, and the NASCLA Contractors Guide.

Are the rental books highlighted and tabbed?

Yes. All included rental books are highlighted and tabbed to support organized study and reference navigation.

How much does the book rental package cost?

The package price is $1,320. An additional $700 refundable deposit is required, making the total initial payment $2,020.

Is the $700 deposit refundable?

Yes. The $700 deposit is refundable if the books are returned in similar condition within 6 months from the time they are received.

Is the Oklahoma HVACR Unlimited Contractor exam open book?

Yes. The examination is open book and allows approved references under PSI examination rules.

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

The technical examination contains 90 questions. Candidates receive 240 minutes to complete the exam, and the passing score is 70 percent, or 63 correct answers.

Does the package include Business and Law references?

Yes. The package includes Oklahoma mechanical licensing materials, administrative regulations, lien law, workers’ compensation material, the fine schedule, and the NASCLA Contractors Guide to Business, Law and Project Management.

Does the package include Manual N?

Yes. Manual N - Commercial Load Calculation for Small Commercial Buildings, 5th Edition is included for commercial load-calculation preparation.

When can Modern Refrigeration and Air Conditioning, 22nd Edition be used in the exam room?

The 22nd Edition is permitted beginning August 13, 2026.

How long should I allow for my book rental order?

Please allow up to 15 business days for book rental package orders.

How should I use the rental books during preparation?

Use the books alongside technical and business review. Practice identifying the correct reference and locating code provisions, calculations, HVACR technical information, safety requirements, statutes, and business-law material efficiently.