Nevada Air Conditioning Contractor (C-21B) Exam Book Package

Prepare for the Nevada Air Conditioning Contractor (C-21B) examination with a focused book package built around the technical references used for the current Nevada trade exam. This package is designed for air conditioning professionals preparing for the Nevada C-21B specialty contractor classification and includes the code books, technical study references, load-calculation material, duct-construction standards, safety material, and evaporative-cooling reference associated with the examination.

The Nevada C-21B Air Conditioning Contractor classification is regulated by the Nevada State Contractors Board. The classification covers the installation, repair, service, and maintenance of equipment, devices, machinery, units, and related ductwork that use evaporation, refrigeration, boilers, or combustion to control air temperatures in structures. The scope also includes associated humidity and thermostatic controls connected with that equipment and ductwork.

The C-21B examination tests a broad range of HVAC knowledge. Candidates should prepare for piping, insulation, hangers and supports, sound and vibration control, heating and cooling principles, refrigeration, load calculations, controls, air-conditioning and heat-pump equipment, furnaces and heaters, chimneys and vents, combustion air, fuel systems, ductwork, evaporative cooling, and construction safety.

This book package includes the Uniform Mechanical Code, 2018; NFPA 54 - National Fuel Gas Code, 2012; Modern Refrigeration and Air Conditioning, 22nd Edition; Code of Federal Regulations - 29 CFR Part 1926 (OSHA); HVAC Duct Construction Standards, Metal and Flexible, 2005, 3rd Edition; Manual N - Commercial Load Calculation for Small Commercial Buildings, 5th Edition; and Evaporative Air Conditioning Handbook, 3rd Edition, 1997. The Evaporative Air Conditioning Handbook is supplied as a used book.

All books in this package are highlighted and tabbed to support organized study and faster navigation. Candidates should become familiar with the purpose of each reference because only specific books are permitted inside the C-21B examination room. The remaining references are study materials used to develop the knowledge needed to answer technical questions but are not permitted in the testing center.

Exam Details

The Nevada Air Conditioning Contractor C-21B trade examination is administered by PSI after the Nevada State Contractors Board determines that an applicant is eligible to test.

• Exam: Nevada C-21B Air Conditioning Contractor
• Number of Questions: 60 scored questions
• Minimum Passing Score: 42 correct answers
• Passing Percentage: 70%
• Time Allowed: 2 hours
• Testing Provider: PSI

The current examination content outline includes the following subject areas:

• Piping: 4 questions
• Insulation: 1 question
• Hangers and Supports: 3 questions
• Sound, Vibration and Seismic Control: 1 question
• Heating and Cooling Principles: 3 questions
• Refrigerants and Refrigeration: 4 questions
• Load Calculations: 6 questions
• Testing, Adjusting and Balancing: 1 question
• Controls: 3 questions
• A/C and Heat Pump Equipment: 4 questions
• Furnaces and Heaters: 4 questions
• Chimneys, Flues and Vents: 3 questions
• Combustion Air: 2 questions
• Fuel Systems: 8 questions
• Ducts: 6 questions
• Evaporative Cooling: 3 questions
• Safety: 4 questions

Fuel Systems is the largest individual category with eight questions. Candidates should devote regular study time to fuel-gas requirements, piping concepts, appliance connections, combustion considerations, and the code requirements addressed by NFPA 54.

Load Calculations and Ducts each contain six questions. Candidates should practice commercial load-calculation concepts and understand duct construction, sizing considerations, materials, supports, fittings, and installation practices. These areas can require both technical knowledge and familiarity with specialized study references.

Refrigerants and Refrigeration, A/C and Heat Pump Equipment, Furnaces and Heaters, Piping, and Safety each contribute four questions. A balanced study plan should therefore include refrigeration-cycle knowledge, equipment components, piping practices, combustion equipment, and OSHA construction-safety concepts.

Open Book Test

The Nevada C-21B Air Conditioning Contractor examination is open book, but only the references specifically approved for the examination room may be brought into the test center.

For the current C-21B examination, the approved exam-room references are:

• Uniform Mechanical Code, 2018
• NFPA 54 - National Fuel Gas Code, 2012

Candidates are responsible for bringing their own approved references. Permitted references may be highlighted, underlined, and indexed before the examination. Permanent tabs may be used. Temporary tabs such as Post-it notes are not allowed and must be removed before testing. Candidate-added writing is not permitted in the examination references.

The Uniform Mechanical Code should be a major focus of navigation practice. Candidates should learn how the code is organized and become comfortable locating requirements involving mechanical systems, ducts, equipment, combustion air, venting, piping, and related installations.

NFPA 54 should be used regularly when preparing for the Fuel Systems portion of the exam. Because Fuel Systems is the largest individual examination category, efficient navigation of the National Fuel Gas Code can be especially valuable.

The other books included in this package are study references and are not permitted in the C-21B examination room. They support preparation for trade-knowledge questions, industry practices, calculations, duct construction, refrigeration principles, safety, and evaporative cooling.

Licensing Steps

The Nevada State Contractors Board regulates contractor licensing in Nevada. Applicants pursuing the C-21B Air Conditioning Contractor classification must complete the applicable experience, application, examination, financial, background, and licensing requirements.

1. Establish qualifying experience. The trade qualifier must document qualifying experience in the C-21B classification.
2. Prepare the Nevada contractor license application. The business applying for licensure must provide the information and documentation required by the Nevada State Contractors Board.
3. Identify the qualifying individual. The applicant must designate an individual who meets the technical experience and examination requirements for the requested classification.
4. Document work experience. Provide acceptable evidence showing the required air-conditioning trade experience within the applicable period.
5. Complete background requirements. Nevada requires the applicable background disclosure and fingerprint process for contractor licensing applicants.
6. Submit required financial information. The licensing process includes financial-responsibility requirements that affect the monetary limit assigned to the license.
7. Receive examination eligibility. After the Board reviews and accepts the applicant's qualifications, examination eligibility is issued.
8. Schedule testing through PSI. Eligible candidates schedule the C-21B trade examination and the required Contractor Management Survey examination when applicable.
9. Pass the required examinations. Complete the C-21B trade exam and the Nevada contractor management examination unless an approved waiver applies.
10. Complete final licensing requirements. Satisfy the applicable bond, fee, and other Board requirements before the contractor license is issued.

State Requirements

Nevada contractor applicants must designate a qualifying individual who has the knowledge, skills, experience, and examination qualifications required for the classification. The qualifier may serve as the trade qualifier, management qualifier, or both when the applicable requirements are satisfied.

For a standard Nevada contractor license, the trade qualifier generally must have at least four years of qualifying experience as a journeyman, foreman, supervising employee, or contractor in the specific classification requested. The required experience must fall within the 15 years immediately preceding the filing of the application.

The documented experience must total at least four full years, or 1,460 days. Nevada requires work-experience documentation supporting the trade qualifier's qualifications. A resume of experience corresponding to the requested classification is also part of the application process unless an applicable exception or endorsement provision applies.

Applicants who qualify for licensure by endorsement may be eligible for a waiver of the trade examination or certain experience-documentation requirements when Nevada recognizes a substantially equivalent license from another state and the endorsement requirements are satisfied.

Nevada also requires contractor applicants to address financial responsibility, bonding, background disclosure, fingerprints, business information, and the monetary limit under which the company will operate. The contractor license is issued to the business entity, with the qualifying individual serving in the required qualifying capacity.

Reference Books

• Uniform Mechanical Code, 2018
  This is an approved exam-room reference for the Nevada C-21B examination. It supports preparation for mechanical system requirements involving equipment, ducts, venting, combustion air, piping, and other code-regulated HVAC installations.
• NFPA 54 - National Fuel Gas Code, 2012
  This is an approved exam-room reference for the C-21B examination and supports preparation for fuel systems, gas piping, appliance-related requirements, combustion, and related fuel-gas topics.
• Modern Refrigeration and Air Conditioning, 22nd Edition
  This study reference supports preparation involving refrigeration principles, refrigerants, air-conditioning and heat-pump equipment, controls, troubleshooting concepts, heating and cooling principles, and HVAC system operation. This book is not permitted in the C-21B examination room.
• Code of Federal Regulations - 29 CFR Part 1926 (OSHA)
  This study reference supports preparation for construction-safety topics tested on the C-21B examination. It is useful for reviewing OSHA jobsite safety concepts but is not permitted in the C-21B examination room.
• HVAC Duct Construction Standards, Metal and Flexible, 2005, 3rd Edition
  This technical study reference supports duct-construction preparation involving metal and flexible duct systems, fabrication, reinforcement, joints, fittings, installation, hangers, and supports. It is not permitted in the C-21B examination room.
• Manual N - Commercial Load Calculation for Small Commercial Buildings, 5th Edition
  This study reference supports commercial HVAC load-calculation preparation. Load Calculations account for six questions on the C-21B examination. This reference is not permitted in the examination room.
• Evaporative Air Conditioning Handbook, 3rd Edition, 1997 (Used)
  This used technical study reference supports preparation for evaporative-cooling principles, equipment, system operation, and applications. Evaporative Cooling is included in the C-21B examination outline. This book is not permitted in the examination room.

All books in this package are highlighted and tabbed to help candidates organize the material and identify important subjects during preparation. For examination-room use, candidates should concentrate navigation practice on the Uniform Mechanical Code and NFPA 54 because these are the references permitted for the C-21B trade exam.

Test Information and Study Materials

A productive C-21B study plan should combine code navigation with technical HVAC knowledge. Some questions can be approached through the permitted code books, while others depend on trade knowledge developed through study of the non-exam-room references.

Prioritize fuel systems. Fuel Systems contains eight questions, the largest individual category. Practice navigating NFPA 54 and review fuel-gas concepts until gas-system questions can be recognized quickly.

Practice load calculations. Load Calculations contains six questions. Use Manual N to reinforce the process used to evaluate heating and cooling loads for small commercial buildings.

Strengthen duct knowledge. Ducts also contains six questions. Review the HVAC Duct Construction Standards for fabrication, fittings, reinforcement, installation, hanging, and support concepts.

Review refrigeration and equipment. Use Modern Refrigeration and Air Conditioning to reinforce refrigerants, refrigeration cycles, controls, air-conditioning equipment, heat pumps, furnaces, and related system principles.

Study evaporative cooling separately. Nevada's climate makes evaporative-cooling knowledge especially relevant to this classification. The examination includes three questions dedicated to evaporative cooling, and the Evaporative Air Conditioning Handbook provides focused preparation for that subject.

Prepare for safety questions. Safety contains four questions. Review applicable OSHA construction-safety concepts and understand how safe work practices relate to air-conditioning installation and service.

Practice timed open-book navigation. Candidates have two hours for 60 questions. Become comfortable locating mechanical-code and fuel-gas requirements without searching broadly through the entire reference.

Nevada contractor applicants should also be prepared for the Contractor Management Survey examination. The current CMS examination contains 60 scored questions plus three non-scored questions. The scored portion allows 120 minutes, with an additional six minutes for the non-scored items. A minimum of 45 scored answers, or 75%, is required to pass. The CMS examination is open book and uses the Construction Business and Law Manual for Nevada as its approved reference.

How 1 Exam Prep Helps You Reach Your Goal

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

A C-21B candidate must prepare for both code-based questions and trade-knowledge questions. Organized preparation helps separate these areas so candidates know when to work with the Uniform Mechanical Code and NFPA 54 and when to strengthen technical knowledge using refrigeration, load-calculation, duct-construction, safety, and evaporative-cooling materials.

Highlighted and tabbed books can help candidates organize large amounts of technical information and spend more study time applying the material. Regular navigation practice with the two approved exam-room references is especially useful because candidates need to locate code requirements efficiently during the timed examination.

Trade-focused study can reinforce refrigeration cycles, fuel systems, heating and cooling principles, duct construction, heat pumps, furnaces, controls, load calculations, and evaporative cooling. Practice-oriented preparation also helps candidates identify weaker subject areas and allocate additional study time where needed.

By combining organized reference materials with technical HVAC review and exam-focused study structure, 1 Exam Prep helps candidates build a practical preparation routine for the Nevada C-21B Air Conditioning Contractor examination.

Frequently Asked Questions

Is the Nevada C-21B Air Conditioning Contractor exam open book?

Yes. The C-21B trade examination is open book, but only specifically approved references may be brought into the exam room.

Which books are allowed in the C-21B exam room?

The Uniform Mechanical Code, 2018 and NFPA 54 - National Fuel Gas Code, 2012 are the approved exam-room references for the current C-21B examination.

Which books in this package are not allowed in the exam room?

Modern Refrigeration and Air Conditioning, OSHA 29 CFR Part 1926, HVAC Duct Construction Standards, Manual N, and the Evaporative Air Conditioning Handbook are study references and are not permitted in the C-21B examination room.

How many questions are on the Nevada C-21B exam?

The examination contains 60 scored questions. Candidates have two hours and need 42 correct answers to meet the 70% passing requirement.

What is the largest exam category?

Fuel Systems is the largest individual category with eight questions. Load Calculations and Ducts each contain six questions.

Are the books highlighted and tabbed?

Yes. The books included in this package are highlighted and tabbed to support organized study and reference navigation.

Is the Evaporative Air Conditioning Handbook new?

No. The Evaporative Air Conditioning Handbook, 3rd Edition, 1997 included with this package is a used book.

How much experience is required for a Nevada C-21B contractor qualifier?

The standard Nevada licensing pathway requires a minimum of four years of qualifying experience as a journeyman, foreman, supervising employee, or contractor in the requested classification within the 15 years immediately preceding the application.

Does Nevada also require a business examination?

Yes. Nevada contractor licensing generally requires the Contractor Management Survey examination in addition to the applicable trade examination unless an approved examination waiver applies.

Does the package help with both code and trade-knowledge preparation?

Yes. The Uniform Mechanical Code and NFPA 54 support code navigation, while the additional study references reinforce refrigeration, safety, ducts, load calculations, equipment, and evaporative-cooling knowledge.