The 1 Package: All-Inclusive Oklahoma HVACR Unlimited Contractor Exam, Licensing & Business Setup Solution

Take a more complete approach to becoming an Oklahoma HVACR Unlimited Contractor with The 1 Package, an all-inclusive solution combining exam preparation materials, highlighted and tabbed rental books, course access, application assistance, and business setup services in one package.

The Oklahoma HVACR Unlimited Contractor classification is the state's unrestricted HVACR contractor category. Unlike the limited classification, the HVACR Unlimited Contractor license is not restricted by equipment tonnage or heating input capacity. The classification covers qualifying cooling products, systems, and equipment, heating equipment, refrigeration, sheet metal, natural gas piping, and related process piping.

The 1 Package is built for candidates who want more than exam books alone. It combines the technical references associated with the HVACR Contractor Unlimited examination with Oklahoma business and law materials, licensing assistance, business formation, EIN filing, and contractor compliance guidance.

The included rental books are highlighted and tabbed to support organized study and reference navigation. Candidates can work with the books throughout their preparation, become familiar with their organization, and practice locating code requirements, HVACR technical information, calculations, safety rules, and Oklahoma contractor requirements.

Please allow up to 15 business days for The 1 Package book orders.

Exam Details

The Oklahoma HVACR Contractor Unlimited examination measures knowledge associated with the installation, maintenance, repair, fabrication, alteration, and extension of air conditioning, refrigeration, heating, and ventilating systems, including ductwork within complete systems without the horsepower or tonnage limits that apply to the 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 covers Electrical Knowledge and Controls, Natural Gas, Air Distribution Systems, Refrigeration and Air Conditioning Systems, Heating Systems, and Safety. Candidates preparing for the unlimited classification should be ready to work across a broad range of commercial and residential HVACR concepts.

Refrigeration and Air Conditioning Systems is a major examination area and includes theory, refrigerants, equipment sizing and design, equipment and components, piping, installation, system operation, troubleshooting, and maintenance.

Heating preparation includes heating theory, combustion air, vents and chimneys, equipment sizing, heating equipment, installation, hydronic systems, operation, troubleshooting, and maintenance. Air Distribution Systems includes duct sizing and design, installation, materials, insulation, ventilation, exhaust systems, testing and balancing, and plans and symbols.

Natural Gas includes piping, valves, connectors, accessories, supports, sizing, materials, and testing. Electrical preparation includes general electrical theory, motors, circuits, and controls. Safety preparation includes construction workplace requirements and OSHA-related topics.

Open Book Test

The Oklahoma HVACR Contractor Unlimited examination is an open book test. Approved reference materials may be brought into the examination center under PSI's testing rules.

Approved references may be highlighted, underlined, and indexed before testing, and permanent tabs are allowed. The highlighted and tabbed rental books included with The 1 Package are designed to support this type of organized preparation.

Open-book testing still requires strong HVACR knowledge and efficient time management. Candidates should know which reference applies to a particular problem rather than searching every book for each answer.

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

Modern Refrigeration and Air Conditioning supports preparation involving refrigeration systems, heating, controls, electrical concepts, equipment, 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 the applicable PSI examination beginning August 13, 2026.

Licensing Steps

1. Gain qualifying mechanical experience. Build verifiable experience in the HVACR trade appropriate to the unlimited contractor classification.
2. Meet contractor qualifications. Oklahoma mechanical contractor applicants must satisfy applicable journeyman requirements and obtain an additional year of mechanical trade experience.
3. Document unlimited-level experience. Experience used to qualify for the HVACR Unlimited classification must demonstrate work beyond the capacity limits 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 state determines examination eligibility before contractor testing can be scheduled.
6. Complete contractor testing. Oklahoma mechanical contractor licensing includes technical trade and business and law examination requirements.
7. Complete active contractor requirements. After passing the required examinations, complete the applicable bond, insurance, and licensing requirements for active contractor status.
8. Set up the business. The 1 Package includes business formation, EIN filing, and contractor compliance guidance to help organize the business side of becoming a contractor.

State Requirements

The Oklahoma HVACR Unlimited Contractor license authorizes qualifying work involving cooling products, systems, or equipment, including process piping, without the size restrictions applied to the limited HVACR classification.

The classification also covers heating equipment and related process piping without the limited classification's equipment-capacity restriction. It includes qualifying sheet metal, natural gas piping, and refrigeration work within the HVACR Unlimited scope.

Applicants for a mechanical contractor license must meet the qualifications applicable to a journeyman and obtain an additional year of mechanical trade experience. Oklahoma's application materials also require experience used for HVACR Unlimited qualification to demonstrate work above 25 tons and 500,000 Btu/h.

Mechanical contractors must be a permanent employee, owner, partner, or officer of the mechanical firm. Active contractors must also satisfy the bond, insurance, and continuing compliance requirements associated with Oklahoma mechanical contracting.

Reference Books

• Included Book: Ductulator
  A duct-sizing tool used for air-distribution calculations involving airflow, duct dimensions, friction, and velocity.
• Included Book: International Mechanical Code, 2018
  Covers mechanical installations, equipment, ventilation, duct systems, exhaust, refrigeration systems, combustion air, chimneys, vents, and related mechanical requirements.
• Included Book: International Fuel Gas Code, 2018
  Covers fuel gas piping, sizing, materials, appliances, installation, combustion air, testing, and venting requirements.
• Included Book: Modern Refrigeration and Air Conditioning, 22nd Edition
  Provides extensive HVACR coverage involving refrigeration, heating, air conditioning, electrical principles, controls, system components, installation, service, and troubleshooting.
• Included Book: Manual N - Commercial Load Calculation for Small Commercial Buildings, 5th Edition
  Supports preparation involving heating and cooling load calculations for small commercial buildings and HVAC equipment-sizing concepts.
• Included Book: Mathematics for Plumbers and Pipefitters, 8th Edition
  Supports 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 federal construction-industry safety standards covering workplace hazards, employee protection, fall protection, ladders, scaffolds, PPE, and related safety requirements.
• Included Book: Oklahoma Mechanical Licensing Act, Oklahoma Statutes, Title 59, Chapter 43A
  Covers Oklahoma statutory provisions governing mechanical licensing and contractor responsibilities.
• Included Book: Oklahoma Mechanical Industry Regulations, Oklahoma Administrative Code, Title 158, Chapter 50
  Contains administrative rules governing Oklahoma mechanical licensing, contractors, and industry compliance.
• Included Book: Oklahoma Fine Schedule of the Construction Industries Board, Oklahoma Administrative Code, Title 158, Chapter 10
  Provides information relating to administrative penalties under Construction Industries Board requirements.
• Included Book: Oklahoma Lien Law, Oklahoma Statutes, Title 42, Chapter 3
  Covers Oklahoma lien provisions relevant to construction contracting and payment rights.
• Included Book: NASCLA Contractors Guide to Business, Law and Project Management, 14th Edition
  Provides contractor-focused material involving estimating, contracts, financial management, project management, labor, risk, business operations, and related subjects.
• 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 references included for the HVACR Contractor Unlimited portion include the Ductulator, 2018 International Mechanical Code, 2018 International Fuel Gas Code, Modern Refrigeration and Air Conditioning, Manual N, Mathematics for Plumbers and Pipefitters, and 29 CFR Part 1926 OSHA.

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

Candidates should work with these materials throughout preparation. Open-book performance depends not only on having the appropriate references available but also on knowing how they are organized and how to locate information efficiently.

Test Information and Study Materials

Preparing for the Oklahoma HVACR Unlimited Contractor exam requires a broader approach than studying one code book or technical subject. Candidates should build a study plan that combines HVACR theory, commercial and residential systems, mechanical codes, fuel gas requirements, load calculations, duct systems, mathematics, safety, and contractor business knowledge.

For Refrigeration and Air Conditioning Systems, review refrigeration theory, refrigerants, equipment sizing and design, components, piping, installation, operation, troubleshooting, and maintenance. The unlimited classification makes commercial system knowledge especially important because the license is not restricted to equipment below the limited-classification capacity thresholds.

Use Manual N when studying small commercial load calculations and the Ductulator when working through air-distribution and duct-sizing concepts. Repeated practice with these tools can help connect calculations to actual HVAC design concepts.

Mechanical and fuel gas code navigation should be practiced separately. Choose subjects such as ventilation, combustion air, duct installation, equipment clearance, fuel gas sizing, or venting and locate the applicable sections in the proper code.

Business and law preparation should include contractor licensing requirements, estimating, contracts, project management, financial management, lien law, workers’ compensation, and Oklahoma administrative requirements.

The 1 Package combines the exam-preparation side of the process with licensing and business setup assistance so candidates can work toward the broader goal of establishing an Oklahoma HVACR contracting business rather than focusing only on test day.

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, licensing assistance, and business setup support.

The highlighted and tabbed rental books help organize a large amount of technical and regulatory material. Candidates can practice locating mechanical code provisions, fuel gas requirements, HVACR technical information, load-calculation material, OSHA standards, and Oklahoma contractor rules.

The included course access provides 1 year of course access, giving candidates a structured period for working through exam preparation while building familiarity with the references. Application Service is also included to support the licensing process.

The business setup portion extends the package beyond examination preparation. Business Formation assistance supports establishing an LLC or corporation, EIN Filing helps obtain the federal Employer Identification Number needed for important business activities, and Contractor Compliance Guidance helps customers understand requirements connected with operating an Oklahoma contracting business.

This combination allows candidates to approach examination preparation, licensing, and business organization as connected parts of the same goal. 1 Exam Prep provides structure and support without guaranteeing examination results, licensing approval, or business outcomes.

FAQ Section

What is included in The 1 Package for Oklahoma HVACR Unlimited Contractors?

The package combines highlighted and tabbed rental references, 1 year of course access, Application Service, Business Formation assistance, EIN Filing with the IRS, and Contractor Compliance Guidance.

How much is The 1 Package?

The package price is $2,945. A $700 refundable deposit is also required, making the total initial payment $3,645.

Are the included 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 1 Package includes 1 year of course access.

Is Application Service included?

Yes. Application Service is included with The 1 Package.

Does The 1 Package include business formation?

Yes. Business Formation assistance for an LLC or corporation is included as part of the business setup services.

Does the package include EIN filing?

Yes. EIN Filing with the IRS is included to help obtain the Employer Identification Number used for business banking, taxes, hiring employees, and other business activities.

Is the Oklahoma HVACR Contractor Unlimited exam open book?

Yes. The technical HVACR Contractor Unlimited examination is open book and allows approved references under the testing provider's rules.

How many questions are on the HVACR Contractor Unlimited exam?

The technical examination contains 90 questions and allows 240 minutes for completion. The passing score is 70 percent, or 63 correct answers.

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

The Limited classification restricts cooling equipment to no more than 25 tons and heating equipment to no more than 500,000 Btu/h per appliance. The HVACR Unlimited Contractor classification does not have those equipment-size restrictions.

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.

How long should I allow for The 1 Package book order?

Please allow up to 15 business days for The 1 Package book orders.