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Nevada C-21B Air Conditioning
Contractor Exam Practice Test
2026
Prepare for the Nevada C-21B Air Conditioning
Contractor license exam with realistic practice questions
and detailed answer keys. This guide covers Manual
J/S/D load calculations, low-voltage controls, electrical
safety, EPA 608 refrigerant handling, gas piping, UMC
codes, and OSHA requirements. Aligned with the PSI-
administered C-21B exam domains. Ideal for HVAC
technicians pursuing Nevada contractor licensure.
Includes two full practice versions with rationales to
reinforce key concepts and test-taking strategy.
Question 1
A contractor holds a Nevada C-21b Air Conditioning Contractor license. Which of the
following tasks is within the authorized scope of this license?
A. Installing and servicing commercial walk-in refrigeration units
B. Installing, repairing, and maintaining air conditioning equipment and associated
ductwork
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C. Performing electrical wiring for an entire commercial building
D. Installing plumbing lines for a residential fire sprinkler system
Answer: B
Rationale: The Nevada C-21b license is a subclassification of the C-21 Refrigeration
and Air-Conditioning license and specifically authorizes work related to air
conditioning systems. This includes the installation, repair, service, and maintenance of
equipment and ductwork that use evaporation, refrigeration, boilers, or combustion to
control air temperatures in structures, including humidity and thermostatic controls
connected to that equipment. Option A is incorrect because commercial refrigeration
work falls under the broader C-21 license, not the C-21b subclassification. Option C is
incorrect because electrical wiring for an entire commercial building requires a
separate electrical contractor license. Option D is incorrect because fire sprinkler
systems fall under fire protection contractor licensing, not HVAC. Clinical reasoning in
licensing follows the same principle as differential diagnosis: you must match the
specific scope of the license to the specific task, ensuring the licensee is legally
authorized and competent to perform that exact work.
Question 2
Which of the following best describes the minimum documented experience
required for a qualifying individual applying for a Nevada C-21b Air Conditioning
Contractor license?
A. 1 year of apprentice-level experience
B. 2 years of general construction experience
C. 4 years of journeyman-level experience in the trade
D. 6 years of managerial experience in a construction firm
Answer: C
Rationale: Nevada requires a qualifying individual for a C-21b license to have a
minimum of 4 years of documented journeyman-level experience in the air
conditioning trade. This requirement ensures the qualifying individual possesses
sufficient hands-on technical competency to supervise and perform HVAC work safely
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and in compliance with codes. Option A is insufficient because apprentice-level
experience does not demonstrate the independent competency required. Option B is
incorrect because general construction experience does not substitute for trade-specific
experience. Option D is incorrect because managerial experience alone does not satisfy
the technical trade requirement. The clinical reasoning here parallels establishing a
diagnosis: you need sufficient evidence of the underlying condition, in this case trade
competency, before proceeding to treatment, which is licensure and practice.
Question 3
A C-21b licensee is preparing to install a new air conditioning system in a commercial
building. Before beginning work, which of the following actions is required?
A. Notify the Nevada State Contractors Board in writing 30 days in advance
B. Pull the required permits from the local building department
C. Obtain a separate refrigeration license
D. Hire a licensed engineer to supervise the entire project
Answer: B
Rationale: Before beginning any regulated HVAC work, a C-21b licensee must pull the
required permits from the local building department, such as Clark County. Permits
ensure the work will be inspected for code compliance and safety. Option A is incorrect
because advance written notification to the State Contractors Board is not a standard
requirement for individual projects. Option C is incorrect because the C-21b license
already authorizes air conditioning work, and a separate refrigeration license is only
needed for refrigeration scope outside the C-21b classification. Option D is incorrect
because while an engineer may be required for certain design aspects, the licensee is
not universally required to hire one to supervise the entire project. The clinical
reasoning is preventive: just as you would confirm a patient's consent and lab results
before surgery, you must confirm permits before construction to avoid legal and safety
complications.
Question 4
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How is the maximum monetary limit per project determined for a Nevada C-21b
contractor?
A. It is fixed at $10,000 for all C-21b licensees
B. It is set by the local building department
C. It is based on the licensee's financial statements submitted to the Board
D. It is determined by the number of employees the contractor has
Answer: C
Rationale: The maximum monetary limit per project for a Nevada contractor license,
including C-21b, is determined by the financial statements the licensee submits to the
Nevada State Contractors Board. This limit can range from under $10,000 to over
$250,000 depending on the financial strength demonstrated. Option A is incorrect
because the limit is not fixed. Option B is incorrect because the building department
issues permits but does not set the contractor's bid limit. Option D is incorrect because
employee count is not the determining factor. The clinical reasoning is risk
stratification: just as a patient's treatment intensity is matched to their physiological
reserve, a contractor's project size is matched to their financial capacity to ensure they
can complete the work and cover potential liabilities.
Question 5
Which of the following is a key difference between a Nevada C-21 license and a C-
21b license?
A. C-21b allows work on both air conditioning and commercial refrigeration, while C-
21 only allows air conditioning
B. C-21 allows work on both air conditioning and commercial refrigeration, while C-
21b is limited to air conditioning
C. C-21b requires a college degree, while C-21 does not
D. C-21 is only for residential work, while C-21b is only for commercial work
Answer: B
Nevada C-21B Air Conditioning
Contractor Exam Practice Test
2026
Prepare for the Nevada C-21B Air Conditioning
Contractor license exam with realistic practice questions
and detailed answer keys. This guide covers Manual
J/S/D load calculations, low-voltage controls, electrical
safety, EPA 608 refrigerant handling, gas piping, UMC
codes, and OSHA requirements. Aligned with the PSI-
administered C-21B exam domains. Ideal for HVAC
technicians pursuing Nevada contractor licensure.
Includes two full practice versions with rationales to
reinforce key concepts and test-taking strategy.
Question 1
A contractor holds a Nevada C-21b Air Conditioning Contractor license. Which of the
following tasks is within the authorized scope of this license?
A. Installing and servicing commercial walk-in refrigeration units
B. Installing, repairing, and maintaining air conditioning equipment and associated
ductwork
,2|Page
C. Performing electrical wiring for an entire commercial building
D. Installing plumbing lines for a residential fire sprinkler system
Answer: B
Rationale: The Nevada C-21b license is a subclassification of the C-21 Refrigeration
and Air-Conditioning license and specifically authorizes work related to air
conditioning systems. This includes the installation, repair, service, and maintenance of
equipment and ductwork that use evaporation, refrigeration, boilers, or combustion to
control air temperatures in structures, including humidity and thermostatic controls
connected to that equipment. Option A is incorrect because commercial refrigeration
work falls under the broader C-21 license, not the C-21b subclassification. Option C is
incorrect because electrical wiring for an entire commercial building requires a
separate electrical contractor license. Option D is incorrect because fire sprinkler
systems fall under fire protection contractor licensing, not HVAC. Clinical reasoning in
licensing follows the same principle as differential diagnosis: you must match the
specific scope of the license to the specific task, ensuring the licensee is legally
authorized and competent to perform that exact work.
Question 2
Which of the following best describes the minimum documented experience
required for a qualifying individual applying for a Nevada C-21b Air Conditioning
Contractor license?
A. 1 year of apprentice-level experience
B. 2 years of general construction experience
C. 4 years of journeyman-level experience in the trade
D. 6 years of managerial experience in a construction firm
Answer: C
Rationale: Nevada requires a qualifying individual for a C-21b license to have a
minimum of 4 years of documented journeyman-level experience in the air
conditioning trade. This requirement ensures the qualifying individual possesses
sufficient hands-on technical competency to supervise and perform HVAC work safely
,3|Page
and in compliance with codes. Option A is insufficient because apprentice-level
experience does not demonstrate the independent competency required. Option B is
incorrect because general construction experience does not substitute for trade-specific
experience. Option D is incorrect because managerial experience alone does not satisfy
the technical trade requirement. The clinical reasoning here parallels establishing a
diagnosis: you need sufficient evidence of the underlying condition, in this case trade
competency, before proceeding to treatment, which is licensure and practice.
Question 3
A C-21b licensee is preparing to install a new air conditioning system in a commercial
building. Before beginning work, which of the following actions is required?
A. Notify the Nevada State Contractors Board in writing 30 days in advance
B. Pull the required permits from the local building department
C. Obtain a separate refrigeration license
D. Hire a licensed engineer to supervise the entire project
Answer: B
Rationale: Before beginning any regulated HVAC work, a C-21b licensee must pull the
required permits from the local building department, such as Clark County. Permits
ensure the work will be inspected for code compliance and safety. Option A is incorrect
because advance written notification to the State Contractors Board is not a standard
requirement for individual projects. Option C is incorrect because the C-21b license
already authorizes air conditioning work, and a separate refrigeration license is only
needed for refrigeration scope outside the C-21b classification. Option D is incorrect
because while an engineer may be required for certain design aspects, the licensee is
not universally required to hire one to supervise the entire project. The clinical
reasoning is preventive: just as you would confirm a patient's consent and lab results
before surgery, you must confirm permits before construction to avoid legal and safety
complications.
Question 4
, 4|Page
How is the maximum monetary limit per project determined for a Nevada C-21b
contractor?
A. It is fixed at $10,000 for all C-21b licensees
B. It is set by the local building department
C. It is based on the licensee's financial statements submitted to the Board
D. It is determined by the number of employees the contractor has
Answer: C
Rationale: The maximum monetary limit per project for a Nevada contractor license,
including C-21b, is determined by the financial statements the licensee submits to the
Nevada State Contractors Board. This limit can range from under $10,000 to over
$250,000 depending on the financial strength demonstrated. Option A is incorrect
because the limit is not fixed. Option B is incorrect because the building department
issues permits but does not set the contractor's bid limit. Option D is incorrect because
employee count is not the determining factor. The clinical reasoning is risk
stratification: just as a patient's treatment intensity is matched to their physiological
reserve, a contractor's project size is matched to their financial capacity to ensure they
can complete the work and cover potential liabilities.
Question 5
Which of the following is a key difference between a Nevada C-21 license and a C-
21b license?
A. C-21b allows work on both air conditioning and commercial refrigeration, while C-
21 only allows air conditioning
B. C-21 allows work on both air conditioning and commercial refrigeration, while C-
21b is limited to air conditioning
C. C-21b requires a college degree, while C-21 does not
D. C-21 is only for residential work, while C-21b is only for commercial work
Answer: B
