Oklahoma HVACR Unlimited Contractor Ultimate Exam Prep Rental Package

Prepare for Oklahoma HVACR Unlimited Contractor licensing with an Ultimate Exam Prep Rental Package that combines highlighted and tabbed reference books, structured course access, and application support. This package is designed for candidates pursuing Oklahoma's unrestricted HVACR contractor classification and preparing for both technical trade knowledge and contractor business requirements.

The Oklahoma HVACR Unlimited Contractor classification covers qualifying air conditioning, refrigeration, heating, ventilation, natural gas piping, sheet metal, and related process piping work without the equipment-size restrictions that apply to the HVACR Limited classification. Candidates pursuing this credential should be prepared for a broad range of technical subjects involving commercial and residential HVACR systems, mechanical codes, fuel gas requirements, load calculations, air distribution, electrical controls, trade mathematics, safety, and contractor responsibilities.

This Ultimate package includes the technical and business references listed below as rental materials. All included rental books are highlighted and tabbed to support organized study and efficient reference navigation. Candidates can work directly with the materials while preparing so they become familiar with chapters, tables, code sections, formulas, definitions, and technical information before examination day.

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

Exam Details

The Oklahoma HVACR Contractor Unlimited examination evaluates knowledge related to the installation, maintenance, repair, fabrication, alteration, and extension of air conditioning, refrigeration, heating, and ventilation systems. The unlimited classification covers complete HVACR systems without the horsepower or tonnage restrictions associated with the limited 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 addresses Electrical Knowledge and Controls, Natural Gas, Air Distribution Systems, Refrigeration and Air Conditioning Systems, Heating Systems, and Safety. Candidates preparing for an unlimited contractor credential should be comfortable working across both residential and commercial HVACR applications.

Electrical preparation can include electrical theory, motors, circuits, and HVACR controls. Natural Gas preparation can include piping, valves, connectors, supports, materials, sizing, and testing. Air Distribution Systems can include duct design, sizing, installation, supports, insulation, ventilation, exhaust systems, fire and smoke control, testing and balancing, and plans and symbols.

Refrigeration and Air Conditioning Systems can include refrigeration theory, refrigerants, equipment sizing and design, components, piping, installation, operation, troubleshooting, and maintenance. Heating Systems can include theory, combustion air, vents and chimneys, equipment sizing, hydronic systems, installation, operation, maintenance, and troubleshooting.

The Oklahoma contractor licensing process also includes business and law preparation. The Oklahoma statutes, administrative regulations, lien law, workers’ compensation material, fine schedule, and NASCLA contractor guide included with this package provide useful resources for studying contractor business 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 testing rules.

Approved references may be highlighted, underlined, and indexed before the examination. Permanent tabs are allowed. This makes the highlighted and tabbed rental materials in the Ultimate package especially useful for developing a consistent reference-navigation routine during preparation.

Open-book testing still requires technical knowledge and time management. Candidates should not depend on searching every reference for every question. A stronger strategy is to identify the subject first, select the reference most likely to contain the information, and then locate the applicable chapter, table, formula, or code provision.

A mechanical installation or ventilation question may require the International Mechanical Code. Natural gas piping, sizing, venting, or combustion air may require the International Fuel Gas Code. Refrigeration, heating, controls, troubleshooting, and system operation may involve Modern Refrigeration and Air Conditioning.

Commercial load-calculation preparation can involve Manual N, while the Ductulator supports air-distribution and duct-sizing work. Mathematics for Plumbers and Pipefitters supports practical trade calculations, and 29 CFR Part 1926 provides construction-safety requirements.

Modern Refrigeration and Air Conditioning, 22nd Edition is permitted for the applicable PSI examination beginning August 13, 2026.

Licensing Steps

1. Gain qualifying mechanical experience. Build verifiable HVACR experience appropriate to the unlimited contractor classification.
2. Meet contractor-level qualifications. Oklahoma mechanical contractor applicants must satisfy the applicable journeyman qualifications and additional contractor experience requirements.
3. Demonstrate unlimited HVACR experience. Experience used for the unlimited classification must support qualification for work beyond the capacity limits of the HVACR Limited classification.
4. Submit the contractor application. Apply for the HVACR Unlimited Contractor classification through the Oklahoma Construction Industries Board.
5. Receive approval to test. Examination eligibility is determined through the state licensing process.
6. Schedule the required examinations. Approved candidates complete the applicable testing process through PSI.
7. Complete the technical and business requirements. Prepare for the HVACR technical examination and applicable contractor business and law requirements.
8. Complete active contractor requirements. Follow Oklahoma requirements for activating and maintaining the contractor license after the examination and licensing requirements are satisfied.

The included Application Service provides support with the licensing application process. This allows candidates to combine exam preparation with application assistance rather than treating the two parts of the licensing process as completely separate tasks.

State Requirements

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

The unlimited classification also covers heating equipment and related process piping without the heating-input restriction associated with the limited category. Qualifying sheet metal, natural gas piping, refrigeration, and related HVACR work are also included within the unlimited classification.

Oklahoma mechanical contractor applicants must meet the applicable journeyman requirements and obtain additional mechanical trade experience. Applicants seeking the HVACR Unlimited classification must demonstrate qualifying experience beyond the capacity limits associated with the HVACR Limited license.

Mechanical contractors must also meet the state requirements applicable to the mechanical firm and active contractor status. Licensing is therefore more than an examination process. Candidates need to address qualifying experience, application requirements, examinations, and ongoing contractor compliance.

Reference Books

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

Exam Room Approved Books

The technical reference materials associated with the Oklahoma HVACR Contractor Unlimited exam include the Ductulator, International Mechanical Code, International Fuel Gas Code, Modern Refrigeration and Air Conditioning, Manual N, Mathematics for Plumbers and Pipefitters, and 29 CFR Part 1926.

The Oklahoma statutes, administrative regulations, NASCLA contractor guide, lien law, workers’ compensation material, and related business references support preparation for contractor business and law requirements.

Use the highlighted and tabbed rental books throughout your study period. Repeated practice helps candidates learn which reference applies to each type of question and where important chapters, tables, formulas, definitions, and code sections are located.

Test Information and Study Materials

Preparation for the Oklahoma HVACR Unlimited Contractor examination should reflect the broad scope of an unrestricted HVACR contractor license. Candidates should be comfortable with residential and commercial systems, larger equipment, commercial load calculations, code navigation, fuel gas systems, air distribution, electrical controls, refrigeration, heating, mathematics, and workplace safety.

For refrigeration and air conditioning, review refrigeration theory, refrigerants, components, equipment sizing, piping, installation, system operation, maintenance, and troubleshooting. Use Modern Refrigeration and Air Conditioning throughout your preparation instead of treating it only as an exam-day reference.

For commercial preparation, work with Manual N and become familiar with small-commercial load-calculation concepts. Use the Ductulator when studying duct sizing and air distribution so calculations become part of your regular study routine.

Mechanical and fuel gas code navigation should also receive dedicated practice. Choose subjects such as ventilation, combustion air, duct installation, fuel gas sizing, equipment requirements, or venting and practice finding the applicable provisions.

Trade mathematics should be practiced by working through problems involving measurements, formulas, conversions, area, volume, and mechanical applications. Safety preparation should include direct navigation of 29 CFR Part 1926 rather than relying entirely on memorized summaries.

Contractor-level preparation should also include business topics. Use the Oklahoma statutes, administrative regulations, lien law, workers’ compensation material, fine schedule, and NASCLA guide to build familiarity with contractor responsibilities and business requirements.

A useful study method is mixed-reference practice. Move between technical subjects, calculations, codes, safety, and business questions during the same study session. Before opening a book, identify which reference should contain the information. This helps build both subject recognition and reference-navigation skills.

How 1 Exam Prep Helps You Reach Your Goal

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

The Ultimate package provides 1 year of course access, giving candidates a structured period to review technical subjects, work with the references, practice navigation, and strengthen weaker areas.

The highlighted and tabbed rental books help organize the large amount of material associated with unlimited contractor preparation. Candidates can work with mechanical codes, fuel gas requirements, commercial load calculations, refrigeration and heating material, OSHA regulations, mathematics, and Oklahoma contractor business resources in a consistent format.

The included Application Service adds support for the licensing side of the process. Exam preparation and licensing paperwork are different parts of the contractor journey, and this package brings them together in one solution.

1 Exam Prep encourages candidates to combine practical HVACR knowledge with organized study, reference navigation, and practice-oriented preparation. The objective is to help candidates develop stronger familiarity with the material and approach the Oklahoma HVACR Unlimited Contractor licensing process with a more structured plan without guaranteeing examination, licensing, or approval outcomes.

FAQ Section

What is included in the Oklahoma HVACR Unlimited Contractor Ultimate Exam Prep Rental Package?

The package includes the listed highlighted and tabbed rental books, HVACR technical references, Oklahoma business and law materials, 1 year of course access, and Application Service.

How much does the Ultimate package cost?

The package price is $2,045. A $700 refundable deposit is required, making the total initial payment $2,745.

Are the rental books highlighted and tabbed?

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

How long is the course access?

The Ultimate package includes 1 year of course access.

Is Application Service included?

Yes. Application Service is included with the Oklahoma HVACR Unlimited Contractor Ultimate Exam Prep Rental Package.

Is the Oklahoma HVACR Unlimited Contractor exam open book?

Yes. The Oklahoma HVACR Contractor Unlimited examination is open book and permits approved reference materials under PSI testing 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.

What is the difference between HVACR Limited and HVACR Unlimited licensing?

The HVACR Limited classification restricts the size of qualifying cooling and heating equipment. The HVACR Unlimited Contractor classification does not have those equipment-capacity restrictions.

Does the package include Manual N?

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

Does the package include contractor business and law materials?

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

How long should I allow for my Ultimate package order?

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

How should I use the rental books during preparation?

Use the books alongside the course and practice-oriented study. Become familiar with which reference applies to each subject and practice locating code provisions, formulas, technical information, calculations, safety requirements, and business-law material efficiently.