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Arizona C-39 HVAC-Refrigeration-Heating EXAM QUESTIONS
AND CORRECT VERIFIED SOLUTIONS LATEST UPDATE THIS
YEAR – JUST RELEASED
Arizona C-39 HVAC/Refrigeration/Heating Exam
10-Line Exam Coverage in Points Form
1. Licensing & Regulations – Arizona ROC jurisdiction and licensing requirements , C-39
(Commercial) vs R-39 (Residential) vs CR-39 (Dual) license distinctions and scope
differences , 4 years verifiable experience required within past 10 years , 70% passing
score required , 80 questions, 3-hour time limit , closed-book exam format , bond
requirements ranging from $2,500 to $50,000 based on gross volume , EPA 608 Universal
certification required for refrigerant handling , and the Arizona Statutes and Rules Exam
(SRE) required separately.
2. Refrigeration Systems (15%) – Vapor-compression cycle fundamentals (compression,
condensation, expansion, evaporation) , R-410A operating pressures (low side ~120 psi
at 75°F, high side 200-300 psi) , R-22 phase-out and replacement , subcooling (cooling
refrigerant below saturation temperature) , superheat measurement , TXV function
(regulates refrigerant flow into evaporator) , accumulator function (prevents liquid
slugging) , pressure switches (prevent compressor overload) , and refrigerant recovery
systems .
3. Air Conditioning Systems (15% exam weight) – System design principles and load
calculations , condenser and evaporator coil functions , compressor operation and
maintenance , expansion devices (TXV vs fixed orifice) , system performance evaluation ,
airflow measurement and balancing , and equipment sizing and efficiency ratings .
4. Warm-Air Heating (10-15% exam weight) – Gas furnaces and space heaters (AFUE
rating) , 2-stage furnace operation (low stage: 40-60% capacity) , heat pump operation
(reversing valve, defrost cycle) , heat exchanger function and inspection (crack detection)
, combustion analysis , venting requirements (Category I-III-IV) , and combustion air
requirements .
5. Water Piping Systems & Boilers (10-15%) – "Wet" heating systems: steam (max 15 PSIG)
and hot water (max 30 PSIG, 220°F) boilers and coils , expansion tank function
(accommodates volume changes due to temperature fluctuations) , pressure-reducing
valves (PRV) , chilled and condensing water systems , low-water cut-off switch function ,
and hydronic system design and installation .
6. Controls (10-15%) – Thermostats (heat anticipator function reduces temperature
overshoot) , pressure switches (compressor protection) , contactors (compressor motor
start/stop) , transformers (step-down to 24V control) , capacitors (start and run) , VFDs
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(variable-frequency drives control motor speed via frequency adjustment) , Ohm's Law
(V = I × R) , and control circuit wiring and troubleshooting .
7. Ventilation & Ducts (5-10%) – Supply/return duct sizing and static pressure (target ~0.2
in. wg per Manual D) , duct fabrication and installation (SMACNA standards) , ventilation
system design including ductwork, air filtering devices, and water treatment devices ,
combustion air for gas equipment , and IAQ considerations .
8. Evaporative Coolers (5%) – Installation and repair of evaporative cooling systems , water
distribution systems , pump operation and maintenance , air distribution through
ductwork , and system performance evaluation .
9. Solar Systems (12% for C-79/CR-79 variants) – Note: C-39 (without solar) does not
permit solar equipment work, while C-79/CR-79 classifications include solar scope .
Topics include collection loops, components, installation, maintenance, mounting,
principles, and solar systems piping .
10. Sizing, Estimating, and Codes – Load calculations and equipment sizing , job cost
estimation , International Mechanical Code (IMC) , International Fuel Gas Code (IFGC) ,
SMACNA HVAC Systems: Testing, Adjusting and Balancing , Modern Refrigeration and Air
Conditioning , and HVAC system design and evaluation .
250 MCQ Questions with Rationales
Question 1
According to Arizona law, which agency is responsible for licensing HVAC contractors?
A) Arizona Department of Environmental Quality
B) Arizona Registrar of Contractors (ROC)
C) Arizona Corporation Commission
D) Arizona Secretary of State
Correct Answer: B
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Rationale: The Arizona Registrar of Contractors (ROC) is the governing board that licenses and
regulates all residential and commercial contractors, including HVAC contractors in the C-39, R-
39, and CR-39 classifications . The ROC administers the examination process and enforces
licensing requirements under Arizona Revised Statutes Title 32, Chapter 10.
Question 2
What is the minimum number of years of verifiable experience required for an Arizona C-39
HVAC contractor license?
A) 2 years
B) 3 years
C) 4 years
D) 5 years
Correct Answer: C
Rationale: Arizona requires a minimum of four years of verifiable experience in the specific
HVAC classification within the past ten years . Up to two years of this experience can be satisfied
through technical training or an apprenticeship program .
Question 3
What is the passing score required for the Arizona C-39 HVAC contractor examination?
A) 60%
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B) 65%
C) 70%
D) 75%
Correct Answer: C
Rationale: All Arizona contractor examinations require a minimum passing score of 70% . This
applies to both the trade-specific exam (80 questions) and the Statutes and Rules Exam (SRE),
with the C-39 exam having a 3-hour time limit .
Question 4
How many questions are on the Arizona C-39 HVAC trade examination?
A) 50 questions
B) 60 questions
C) 80 questions
D) 100 questions
Correct Answer: C
Rationale: The C-39 Air Conditioning and Refrigeration exam consists of 80 multiple-choice
questions . Candidates have a 3-hour time limit to complete the exam, and a score of 70% is
required to pass .
Arizona C-39 HVAC-Refrigeration-Heating EXAM QUESTIONS
AND CORRECT VERIFIED SOLUTIONS LATEST UPDATE THIS
YEAR – JUST RELEASED
Arizona C-39 HVAC/Refrigeration/Heating Exam
10-Line Exam Coverage in Points Form
1. Licensing & Regulations – Arizona ROC jurisdiction and licensing requirements , C-39
(Commercial) vs R-39 (Residential) vs CR-39 (Dual) license distinctions and scope
differences , 4 years verifiable experience required within past 10 years , 70% passing
score required , 80 questions, 3-hour time limit , closed-book exam format , bond
requirements ranging from $2,500 to $50,000 based on gross volume , EPA 608 Universal
certification required for refrigerant handling , and the Arizona Statutes and Rules Exam
(SRE) required separately.
2. Refrigeration Systems (15%) – Vapor-compression cycle fundamentals (compression,
condensation, expansion, evaporation) , R-410A operating pressures (low side ~120 psi
at 75°F, high side 200-300 psi) , R-22 phase-out and replacement , subcooling (cooling
refrigerant below saturation temperature) , superheat measurement , TXV function
(regulates refrigerant flow into evaporator) , accumulator function (prevents liquid
slugging) , pressure switches (prevent compressor overload) , and refrigerant recovery
systems .
3. Air Conditioning Systems (15% exam weight) – System design principles and load
calculations , condenser and evaporator coil functions , compressor operation and
maintenance , expansion devices (TXV vs fixed orifice) , system performance evaluation ,
airflow measurement and balancing , and equipment sizing and efficiency ratings .
4. Warm-Air Heating (10-15% exam weight) – Gas furnaces and space heaters (AFUE
rating) , 2-stage furnace operation (low stage: 40-60% capacity) , heat pump operation
(reversing valve, defrost cycle) , heat exchanger function and inspection (crack detection)
, combustion analysis , venting requirements (Category I-III-IV) , and combustion air
requirements .
5. Water Piping Systems & Boilers (10-15%) – "Wet" heating systems: steam (max 15 PSIG)
and hot water (max 30 PSIG, 220°F) boilers and coils , expansion tank function
(accommodates volume changes due to temperature fluctuations) , pressure-reducing
valves (PRV) , chilled and condensing water systems , low-water cut-off switch function ,
and hydronic system design and installation .
6. Controls (10-15%) – Thermostats (heat anticipator function reduces temperature
overshoot) , pressure switches (compressor protection) , contactors (compressor motor
start/stop) , transformers (step-down to 24V control) , capacitors (start and run) , VFDs
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(variable-frequency drives control motor speed via frequency adjustment) , Ohm's Law
(V = I × R) , and control circuit wiring and troubleshooting .
7. Ventilation & Ducts (5-10%) – Supply/return duct sizing and static pressure (target ~0.2
in. wg per Manual D) , duct fabrication and installation (SMACNA standards) , ventilation
system design including ductwork, air filtering devices, and water treatment devices ,
combustion air for gas equipment , and IAQ considerations .
8. Evaporative Coolers (5%) – Installation and repair of evaporative cooling systems , water
distribution systems , pump operation and maintenance , air distribution through
ductwork , and system performance evaluation .
9. Solar Systems (12% for C-79/CR-79 variants) – Note: C-39 (without solar) does not
permit solar equipment work, while C-79/CR-79 classifications include solar scope .
Topics include collection loops, components, installation, maintenance, mounting,
principles, and solar systems piping .
10. Sizing, Estimating, and Codes – Load calculations and equipment sizing , job cost
estimation , International Mechanical Code (IMC) , International Fuel Gas Code (IFGC) ,
SMACNA HVAC Systems: Testing, Adjusting and Balancing , Modern Refrigeration and Air
Conditioning , and HVAC system design and evaluation .
250 MCQ Questions with Rationales
Question 1
According to Arizona law, which agency is responsible for licensing HVAC contractors?
A) Arizona Department of Environmental Quality
B) Arizona Registrar of Contractors (ROC)
C) Arizona Corporation Commission
D) Arizona Secretary of State
Correct Answer: B
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Rationale: The Arizona Registrar of Contractors (ROC) is the governing board that licenses and
regulates all residential and commercial contractors, including HVAC contractors in the C-39, R-
39, and CR-39 classifications . The ROC administers the examination process and enforces
licensing requirements under Arizona Revised Statutes Title 32, Chapter 10.
Question 2
What is the minimum number of years of verifiable experience required for an Arizona C-39
HVAC contractor license?
A) 2 years
B) 3 years
C) 4 years
D) 5 years
Correct Answer: C
Rationale: Arizona requires a minimum of four years of verifiable experience in the specific
HVAC classification within the past ten years . Up to two years of this experience can be satisfied
through technical training or an apprenticeship program .
Question 3
What is the passing score required for the Arizona C-39 HVAC contractor examination?
A) 60%
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B) 65%
C) 70%
D) 75%
Correct Answer: C
Rationale: All Arizona contractor examinations require a minimum passing score of 70% . This
applies to both the trade-specific exam (80 questions) and the Statutes and Rules Exam (SRE),
with the C-39 exam having a 3-hour time limit .
Question 4
How many questions are on the Arizona C-39 HVAC trade examination?
A) 50 questions
B) 60 questions
C) 80 questions
D) 100 questions
Correct Answer: C
Rationale: The C-39 Air Conditioning and Refrigeration exam consists of 80 multiple-choice
questions . Candidates have a 3-hour time limit to complete the exam, and a score of 70% is
required to pass .
