FLORIDA CLASS B AIR CONDITIONING CONTRACTOR EXAMINATION | COMPREHENSIVE
PRACTICE EXAM | 150+ ACTUAL STUDY GUIDE QUESTIONS & 100% CORRECT ANSWERS
WITH RATIONALES | 2026/2027 LATEST UPDATE | ADVANCED CERTIFICATION REVIEW &
VERIFIED SOLUTIONS
TABLE OF CONTENTS
i. Florida Class B Licensing Scope, Contracting Law & Compliance
ii. HVAC System Design, Load Analysis & Equipment Selection
iii. Psychrometrics, Heat Transfer & Airflow
iv. Duct Design, Distribution & Ventilation
v. Refrigeration Systems, Piping & Refrigerants
vi. Compressors, Condensers, Evaporators & Metering Devices
vii. Electrical Systems, Motors, Controls & Troubleshooting
viii. Heating Systems, Combustion & Safety
ix. Indoor Air Quality, Humidity & Building Science
x. Energy Efficiency, Commissioning & Performance Verification
xi. Condensate, Piping, Insulation & System Installation
xii. Advanced Troubleshooting & Diagnostic Decision-Making
xiii. Florida Building, Mechanical, Energy & Safety Requirements
xiv. Documentation, Inspection, Professional Practice & Ethics
xv. Integrated Advanced Contractor Scenarios
DESCRIPTION
This comprehensive practice examination prepares candidates for the Florida Class B Air
Conditioning Contractor Examination by testing advanced knowledge of HVAC design,
installation, maintenance, refrigeration, electrical systems, controls, ductwork, ventilation,
energy efficiency, safety, code compliance, troubleshooting, and contractor responsibilities.
It is designed for experienced HVAC professionals, contractor candidates, technicians,
supervisors, and students seeking advanced licensing preparation. The examination contains
150 challenging questions with answers and concise rationales emphasizing application,
calculations, regulatory judgment, troubleshooting, and realistic field decisions. Expect
difficult scenario-based questions that require interpretation rather than memorization.
(purchase and instantly get a downloadable and editable pdf)
QUESTIONS 1–150
Question 1
A Florida Class B air-conditioning contractor is evaluating a proposed project containing
one 30-ton cooling system. Which conclusion most accurately reflects the contractor's
licensing scope?
A. The contractor may perform the work because the heating capacity determines the
classification.
B. The contractor may perform the work if the system is divided among multiple air
,handlers.
C. The contractor's Class B scope is exceeded because cooling capacity is limited to 25 tons
in any one system.
D. The contractor may perform the work whenever the project is residential.
🔴 Correct Answer: C. The contractor's Class B scope is exceeded because cooling
capacity is limited to 25 tons in any one system.
🔵 Explanation: Florida Class B air-conditioning contracting is limited to 25 tons of cooling
and 500,000 Btu of heating in any one system. A system exceeding the cooling limitation
requires an appropriate broader classification or other legally qualified contractor.
Question 2
A Class B contractor is contracted to install a 20-ton cooling system with a 450,000 Btu
heating capacity. Which licensing conclusion is most appropriate?
A. The heating capacity automatically exceeds Class B scope.
B. Both capacities fall within the Class B limits.
C. The cooling capacity exceeds Class B scope because the system is commercial.
D. Class B contractors cannot install heating equipment.
🔴 Correct Answer: B. Both capacities fall within the Class B limits.
🔵 Explanation: Class B scope permits systems up to 25 tons of cooling and 500,000 Btu of
heating in any one system. The stated capacities are within both thresholds.
Question 3
A Class B contractor proposes to connect new HVAC equipment directly to a building's
sanitary sewer system for condensate disposal. What is the most appropriate action?
A. Proceed if the pipe is properly trapped.
B. Proceed if the sanitary line is oversized.
C. Use an approved disposal method other than a direct sanitary connection within the
contractor's permitted scope.
D. Obtain verbal approval from the property owner.
🔴 Correct Answer: C. Use an approved disposal method other than a direct sanitary
connection within the contractor's permitted scope.
🔵 Explanation: The Class B scope permits condensate drains to an existing safe waste or
other approved disposal but excludes direct connection to a sanitary system.
Question 4
A contractor is asked to install a natural-gas fuel line inside a building as part of an HVAC
replacement. The contractor holds only a Class B air-conditioning license. What is the best
decision?
A. Perform the work because gas piping is incidental to HVAC.
B. Perform the work if the gas pipe is smaller than 1 inch.
,C. Perform the work only after obtaining owner authorization.
D. Decline the gas-piping work unless appropriately licensed for that scope.
🔴 Correct Answer: D. Decline the gas-piping work unless appropriately licensed for that
scope.
🔵 Explanation: The Class B air-conditioning scope does not generally authorize installation
of LP-gas or natural-gas fuel lines within buildings. Incidental HVAC status does not expand
the contractor's statutory scope.
Question 5
A Class B contractor is replacing a rooftop unit and needs to modify a portion of ductwork
necessary to complete the air-distribution system. Which approach is most consistent with
the licensing scope?
A. Perform all duct construction for the entire building regardless of the HVAC contract.
B. Perform ductwork only to the extent necessary to complete the air-distribution system
being installed under the classification.
C. Perform unrelated architectural ductwork because it is made of sheet metal.
D. Perform ductwork only when no building permit is required.
🔴 Correct Answer: B. Perform ductwork only to the extent necessary to complete the
air-distribution system being installed under the classification.
🔵 Explanation: Class B scope includes ductwork connected with a complete system only to
the extent necessary to complete the air-distribution system being installed under that
classification.
Question 6
A customer asks a Class B contractor to repair a dedicated HVAC circuit upstream of the
existing dedicated disconnect. What is the critical licensing concern?
A. The contractor may freely modify any electrical wiring associated with HVAC.
B. The permitted HVAC electrical work does not authorize general electrical power wiring
outside its defined scope.
C. HVAC contractors automatically possess unlimited electrical contracting authority.
D. The work becomes permissible if the circuit is 120 volts.
🔴 Correct Answer: B. The permitted HVAC electrical work does not authorize general
electrical power wiring outside its defined scope.
🔵 Explanation: HVAC licensing provisions provide limited electrical privileges associated with
dedicated HVAC equipment and controls. They do not create unrestricted electrical contracting
authority.
Question 7
A Class B contractor must disconnect an existing single-phase HVAC unit at its dedicated
disconnect before replacement. Which principle is most important?
, A. The contractor may ignore electrical safety because the disconnect is nearby.
B. The contractor should verify de-energization and remain within the permitted electrical
scope.
C. The contractor should remove the building's main service conductors.
D. The contractor should bypass the disconnect temporarily.
🔴 Correct Answer: B. The contractor should verify de-energization and remain within
the permitted electrical scope.
🔵 Explanation: Disconnecting HVAC equipment does not eliminate shock or arc-flash
hazards. Proper isolation, verification, and scope limitations remain essential.
Question 8
During commissioning, a Class B contractor discovers that the installed HVAC system
exceeds the contractor's licensing limitation. What is the most professionally appropriate
response?
A. Continue because the equipment was already installed.
B. Complete only the refrigerant work.
C. Stop the unauthorized portion and involve a properly qualified contractor.
D. Reduce the thermostat setpoint to make the equipment legally smaller.
🔴 Correct Answer: C. Stop the unauthorized portion and involve a properly qualified
contractor.
🔵 Explanation: Contractor licensing scope is determined by the actual work and system
capacity, not by operational settings. Continuing work outside the authorized scope creates
regulatory and professional risk.
Question 9
A contractor is asked to test and evaluate a central HVAC system without performing
regulated installation or repair. Which statement is most accurate?
A. Testing and evaluation are always prohibited to Class B contractors.
B. Testing and evaluation can be performed, and mandatory licensing is not established
specifically for those services.
C. Testing automatically changes the contractor's classification to Class A.
D. Testing is equivalent to replacing the system.
🔴 Correct Answer: B. Testing and evaluation can be performed, and mandatory licensing
is not established specifically for those services.
🔵 Explanation: Florida's contractor classifications recognize testing and evaluation of central
air-conditioning, refrigeration, heating, and ventilation systems as services for which a
mandatory licensing requirement is not established.
Question 10
A contractor's license permits HVAC work, but the proposed project also requires potable-
water piping unrelated to the HVAC condensate system. What is the best interpretation?
PRACTICE EXAM | 150+ ACTUAL STUDY GUIDE QUESTIONS & 100% CORRECT ANSWERS
WITH RATIONALES | 2026/2027 LATEST UPDATE | ADVANCED CERTIFICATION REVIEW &
VERIFIED SOLUTIONS
TABLE OF CONTENTS
i. Florida Class B Licensing Scope, Contracting Law & Compliance
ii. HVAC System Design, Load Analysis & Equipment Selection
iii. Psychrometrics, Heat Transfer & Airflow
iv. Duct Design, Distribution & Ventilation
v. Refrigeration Systems, Piping & Refrigerants
vi. Compressors, Condensers, Evaporators & Metering Devices
vii. Electrical Systems, Motors, Controls & Troubleshooting
viii. Heating Systems, Combustion & Safety
ix. Indoor Air Quality, Humidity & Building Science
x. Energy Efficiency, Commissioning & Performance Verification
xi. Condensate, Piping, Insulation & System Installation
xii. Advanced Troubleshooting & Diagnostic Decision-Making
xiii. Florida Building, Mechanical, Energy & Safety Requirements
xiv. Documentation, Inspection, Professional Practice & Ethics
xv. Integrated Advanced Contractor Scenarios
DESCRIPTION
This comprehensive practice examination prepares candidates for the Florida Class B Air
Conditioning Contractor Examination by testing advanced knowledge of HVAC design,
installation, maintenance, refrigeration, electrical systems, controls, ductwork, ventilation,
energy efficiency, safety, code compliance, troubleshooting, and contractor responsibilities.
It is designed for experienced HVAC professionals, contractor candidates, technicians,
supervisors, and students seeking advanced licensing preparation. The examination contains
150 challenging questions with answers and concise rationales emphasizing application,
calculations, regulatory judgment, troubleshooting, and realistic field decisions. Expect
difficult scenario-based questions that require interpretation rather than memorization.
(purchase and instantly get a downloadable and editable pdf)
QUESTIONS 1–150
Question 1
A Florida Class B air-conditioning contractor is evaluating a proposed project containing
one 30-ton cooling system. Which conclusion most accurately reflects the contractor's
licensing scope?
A. The contractor may perform the work because the heating capacity determines the
classification.
B. The contractor may perform the work if the system is divided among multiple air
,handlers.
C. The contractor's Class B scope is exceeded because cooling capacity is limited to 25 tons
in any one system.
D. The contractor may perform the work whenever the project is residential.
🔴 Correct Answer: C. The contractor's Class B scope is exceeded because cooling
capacity is limited to 25 tons in any one system.
🔵 Explanation: Florida Class B air-conditioning contracting is limited to 25 tons of cooling
and 500,000 Btu of heating in any one system. A system exceeding the cooling limitation
requires an appropriate broader classification or other legally qualified contractor.
Question 2
A Class B contractor is contracted to install a 20-ton cooling system with a 450,000 Btu
heating capacity. Which licensing conclusion is most appropriate?
A. The heating capacity automatically exceeds Class B scope.
B. Both capacities fall within the Class B limits.
C. The cooling capacity exceeds Class B scope because the system is commercial.
D. Class B contractors cannot install heating equipment.
🔴 Correct Answer: B. Both capacities fall within the Class B limits.
🔵 Explanation: Class B scope permits systems up to 25 tons of cooling and 500,000 Btu of
heating in any one system. The stated capacities are within both thresholds.
Question 3
A Class B contractor proposes to connect new HVAC equipment directly to a building's
sanitary sewer system for condensate disposal. What is the most appropriate action?
A. Proceed if the pipe is properly trapped.
B. Proceed if the sanitary line is oversized.
C. Use an approved disposal method other than a direct sanitary connection within the
contractor's permitted scope.
D. Obtain verbal approval from the property owner.
🔴 Correct Answer: C. Use an approved disposal method other than a direct sanitary
connection within the contractor's permitted scope.
🔵 Explanation: The Class B scope permits condensate drains to an existing safe waste or
other approved disposal but excludes direct connection to a sanitary system.
Question 4
A contractor is asked to install a natural-gas fuel line inside a building as part of an HVAC
replacement. The contractor holds only a Class B air-conditioning license. What is the best
decision?
A. Perform the work because gas piping is incidental to HVAC.
B. Perform the work if the gas pipe is smaller than 1 inch.
,C. Perform the work only after obtaining owner authorization.
D. Decline the gas-piping work unless appropriately licensed for that scope.
🔴 Correct Answer: D. Decline the gas-piping work unless appropriately licensed for that
scope.
🔵 Explanation: The Class B air-conditioning scope does not generally authorize installation
of LP-gas or natural-gas fuel lines within buildings. Incidental HVAC status does not expand
the contractor's statutory scope.
Question 5
A Class B contractor is replacing a rooftop unit and needs to modify a portion of ductwork
necessary to complete the air-distribution system. Which approach is most consistent with
the licensing scope?
A. Perform all duct construction for the entire building regardless of the HVAC contract.
B. Perform ductwork only to the extent necessary to complete the air-distribution system
being installed under the classification.
C. Perform unrelated architectural ductwork because it is made of sheet metal.
D. Perform ductwork only when no building permit is required.
🔴 Correct Answer: B. Perform ductwork only to the extent necessary to complete the
air-distribution system being installed under the classification.
🔵 Explanation: Class B scope includes ductwork connected with a complete system only to
the extent necessary to complete the air-distribution system being installed under that
classification.
Question 6
A customer asks a Class B contractor to repair a dedicated HVAC circuit upstream of the
existing dedicated disconnect. What is the critical licensing concern?
A. The contractor may freely modify any electrical wiring associated with HVAC.
B. The permitted HVAC electrical work does not authorize general electrical power wiring
outside its defined scope.
C. HVAC contractors automatically possess unlimited electrical contracting authority.
D. The work becomes permissible if the circuit is 120 volts.
🔴 Correct Answer: B. The permitted HVAC electrical work does not authorize general
electrical power wiring outside its defined scope.
🔵 Explanation: HVAC licensing provisions provide limited electrical privileges associated with
dedicated HVAC equipment and controls. They do not create unrestricted electrical contracting
authority.
Question 7
A Class B contractor must disconnect an existing single-phase HVAC unit at its dedicated
disconnect before replacement. Which principle is most important?
, A. The contractor may ignore electrical safety because the disconnect is nearby.
B. The contractor should verify de-energization and remain within the permitted electrical
scope.
C. The contractor should remove the building's main service conductors.
D. The contractor should bypass the disconnect temporarily.
🔴 Correct Answer: B. The contractor should verify de-energization and remain within
the permitted electrical scope.
🔵 Explanation: Disconnecting HVAC equipment does not eliminate shock or arc-flash
hazards. Proper isolation, verification, and scope limitations remain essential.
Question 8
During commissioning, a Class B contractor discovers that the installed HVAC system
exceeds the contractor's licensing limitation. What is the most professionally appropriate
response?
A. Continue because the equipment was already installed.
B. Complete only the refrigerant work.
C. Stop the unauthorized portion and involve a properly qualified contractor.
D. Reduce the thermostat setpoint to make the equipment legally smaller.
🔴 Correct Answer: C. Stop the unauthorized portion and involve a properly qualified
contractor.
🔵 Explanation: Contractor licensing scope is determined by the actual work and system
capacity, not by operational settings. Continuing work outside the authorized scope creates
regulatory and professional risk.
Question 9
A contractor is asked to test and evaluate a central HVAC system without performing
regulated installation or repair. Which statement is most accurate?
A. Testing and evaluation are always prohibited to Class B contractors.
B. Testing and evaluation can be performed, and mandatory licensing is not established
specifically for those services.
C. Testing automatically changes the contractor's classification to Class A.
D. Testing is equivalent to replacing the system.
🔴 Correct Answer: B. Testing and evaluation can be performed, and mandatory licensing
is not established specifically for those services.
🔵 Explanation: Florida's contractor classifications recognize testing and evaluation of central
air-conditioning, refrigeration, heating, and ventilation systems as services for which a
mandatory licensing requirement is not established.
Question 10
A contractor's license permits HVAC work, but the proposed project also requires potable-
water piping unrelated to the HVAC condensate system. What is the best interpretation?
