100+ Free BPI AC/Heat Pump Practice Questions

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In a standard vapor-compression refrigeration cycle, what is the primary function of the compressor?

To convert refrigerant from liquid to gas

To increase the pressure and temperature of the refrigerant vapor

To regulate the flow rate of refrigerant through the system

To remove heat from the indoor air

to track

2026 Statistics

Key Facts: BPI AC/Heat Pump Exam

100

Online Exam Questions

BPI

70%

Passing Score

BPI

2 hrs

Online Exam Time

BPI

85%

CAZ/CO Passing Score

BPI

2 hrs

Field Exam Time

BPI

3 years

Certification Validity

BPI

The BPI AC/Heat Pump exam has 100 multiple-choice questions in 2 hours with a 70% passing score. Plus a 2-hour field exam (70% overall, 85% for CAZ/CO). Major domains: AC Systems (20%), Heat Pumps (20%), Refrigerant & Electrical (20%), Airflow & Ducts (15%), Building Science (10%), Combustion Safety (10%), DHW (5%). Requires EPA 608 Type II or Universal cert.

Sample BPI AC/Heat Pump Practice Questions

Try these sample questions to test your BPI AC/Heat Pump exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In a standard vapor-compression refrigeration cycle, what is the primary function of the compressor?

A.To convert refrigerant from liquid to gas

B.To increase the pressure and temperature of the refrigerant vapor

C.To regulate the flow rate of refrigerant through the system

D.To remove heat from the indoor air

Explanation: The compressor increases the pressure and temperature of the low-pressure refrigerant vapor from the evaporator, converting it into a high-pressure, high-temperature superheated vapor. This pressure increase is essential because it raises the refrigerant's condensing temperature above the outdoor ambient temperature, allowing heat rejection at the condenser. Exam tip: Remember the compressor adds energy (work) to the refrigerant, which is why it draws significant electrical power.

2What are the four main components of the basic vapor-compression refrigeration cycle?

A.Compressor, condenser, receiver, subcooler

B.Condenser, evaporator, reversing valve, accumulator

C.Compressor, condenser, metering device, evaporator

D.Compressor, heat exchanger, filter drier, accumulator

Explanation: The four essential components of the vapor-compression refrigeration cycle are the compressor (raises pressure), condenser (rejects heat), metering device (reduces pressure), and evaporator (absorbs heat). Every AC and heat pump system contains these four components in a closed loop. Exam tip: The metering device may also be called an expansion device, TXV, or fixed orifice depending on the system type.

3What physical state change does the refrigerant undergo in the evaporator coil?

A.Liquid to gas (evaporation)

B.Superheated vapor to saturated vapor

C.Liquid to solid (freezing)

D.Gas to liquid (condensation)

Explanation: In the evaporator coil, the low-pressure liquid refrigerant absorbs heat from the indoor air and changes state from liquid to gas (evaporation). This phase change occurs at a constant temperature and pressure, and the latent heat absorbed during this process is what produces the cooling effect. Exam tip: The evaporator is on the low-pressure side of the system and is where the cooling actually happens.

4Superheat is defined as the temperature of a refrigerant vapor above its:

A.Condensing temperature

B.Saturation temperature at a given pressure

C.Ambient temperature

D.Discharge line temperature

Explanation: Superheat is the difference between the actual temperature of the refrigerant vapor and its saturation (boiling) temperature at the current pressure. Measuring superheat at the evaporator outlet confirms that all liquid refrigerant has fully evaporated before entering the compressor, protecting it from liquid slugging. Exam tip: Superheat = Actual suction line temperature minus saturation temperature at suction pressure.

5What is subcooling in a refrigeration system?

A.The temperature of liquid refrigerant below its saturation temperature at a given pressure

B.The difference between indoor and outdoor ambient temperatures

C.The temperature of refrigerant entering the compressor

D.The temperature drop across the evaporator coil

Explanation: Subcooling is the temperature difference between the actual liquid refrigerant temperature and its saturation (condensing) temperature at the current pressure. Proper subcooling ensures that only liquid refrigerant reaches the metering device, preventing flash gas that reduces system efficiency. Exam tip: Subcooling = Saturation temperature at liquid line pressure minus actual liquid line temperature.

6Which refrigerant has been the most common replacement for R-22 in residential air conditioning and heat pump systems?

A.R-410A

B.R-290

C.R-744

D.R-134a

Explanation: R-410A became the standard replacement for R-22 (which was phased out due to its ozone-depleting potential) in residential AC and heat pump systems. R-410A operates at higher pressures than R-22 and has zero ozone depletion potential, though it has a relatively high global warming potential (GWP). Exam tip: R-410A systems require components rated for higher operating pressures and cannot use R-22 equipment.

7What does SEER stand for in HVAC equipment ratings?

A.System Electrical Efficiency Ratio

B.Seasonal Energy Efficiency Ratio

C.Standard Energy Efficiency Rating

D.Standardized Equipment Efficiency Report

Explanation: SEER stands for Seasonal Energy Efficiency Ratio, which measures cooling efficiency over an entire cooling season. It is calculated by dividing the total cooling output (in BTU) by the total electrical energy input (in watt-hours) over a typical cooling season. Higher SEER values indicate greater efficiency. Exam tip: SEER accounts for varying outdoor temperatures, making it more representative of real-world performance than EER.

8What is the function of the reversing valve in a heat pump system?

A.To switch the direction of refrigerant flow between heating and cooling modes

B.To maintain constant suction pressure

C.To regulate refrigerant flow rate based on demand

D.To prevent liquid refrigerant from entering the compressor

Explanation: The reversing valve (also called a four-way valve) switches the direction of refrigerant flow, allowing the heat pump to operate in both heating and cooling modes. In cooling mode, the indoor coil acts as the evaporator; in heating mode, it acts as the condenser. Exam tip: Most heat pump reversing valves are energized in cooling mode and de-energized in heating mode, so a valve failure defaults to heating.

9According to BPI standards, what is the primary purpose of combustion appliance zone (CAZ) testing?

A.To measure the efficiency of the cooling system

B.To calculate the heating load of the building

C.To verify that combustion appliances vent properly and do not create carbon monoxide hazards

D.To determine the correct refrigerant charge

Explanation: CAZ testing verifies that combustion appliances (furnaces, water heaters, boilers) vent properly under worst-case depressurization conditions and do not produce dangerous levels of carbon monoxide. BPI requires this testing because changes to the building envelope or HVAC systems can affect combustion appliance safety. Exam tip: BPI requires 85% or higher on the CAZ/CO section of the field exam, reflecting the critical safety importance.

10What instrument is used to measure static pressure in a duct system?

A.Combustion analyzer

B.Refractometer

C.Psychrometer

D.Manometer

Explanation: A manometer (or digital pressure gauge) is used to measure static pressure in duct systems, typically expressed in inches of water column (iwc). Static pressure readings help BPI professionals assess whether the duct system is properly sized for the equipment and identify restrictions or leaks. Exam tip: Total external static pressure (TESP) is measured as the sum of supply and return static pressures at the air handler.

About the BPI AC/Heat Pump Exam

The BPI AC & Heat Pump Professional certification validates advanced competency in diagnosing and servicing air conditioning and heat pump systems. The exam covers HVAC system operation, refrigerant charge verification, airflow and duct diagnostics, electrical measurements, combustion appliance safety, and building science fundamentals. Candidates must pass both a 100-question online exam and a hands-on field exam to earn certification.

Questions

100 scored questions

Time Limit

2 hours (online) + 2 hours (field)

Passing Score

70% (85% for CAZ/CO sections on field exam)

Exam Fee

Set by BPI Test Centers (BPI Test Centers)

BPI AC/Heat Pump Exam Content Outline

20%

Air Conditioning Systems

AC system types, components, operation principles, efficiency ratings, sizing calculations

20%

Heat Pump Systems

Air-source and mini-split heat pumps, defrost cycles, auxiliary heat, cold-climate operation

20%

Refrigerant and Electrical Diagnostics

Refrigerant charge verification, superheat/subcooling, electrical measurements, component testing

15%

Airflow and Duct Systems

Airflow measurement, duct leakage testing, static pressure, duct design principles

10%

Building Science Fundamentals

Heat transfer, moisture dynamics, thermal and pressure boundaries, ANSI/BPI-1200

10%

Combustion Safety and IAQ

CAZ testing, CO measurement, combustion appliance safety, ventilation, ASHRAE 62.2

Domestic Hot Water

Water heating systems, heat pump water heaters, efficiency measures

How to Pass the BPI AC/Heat Pump Exam

What You Need to Know

Passing score: 70% (85% for CAZ/CO sections on field exam)
Exam length: 100 questions
Time limit: 2 hours (online) + 2 hours (field)
Exam fee: Set by BPI Test Centers

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

BPI AC/Heat Pump Study Tips from Top Performers

1Master superheat and subcooling calculations for diagnosing refrigerant charge issues

2Know how to set up and interpret blower door and duct leakage test results

3Study heat pump defrost cycle operation and auxiliary heat staging for cold climates

4Practice static pressure measurement and airflow calculations using fan tables

5Understand CAZ testing procedures and CO action levels — the field exam requires 85% on these

Frequently Asked Questions

What is the BPI AC/Heat Pump Professional exam?

The BPI AC & Heat Pump Professional certification validates proficiency in diagnosing and servicing cooling and heat pump systems. It has a 100-question online exam (2 hours, 70% to pass) plus a hands-on field exam (2 hours, 70% overall, 85% for CAZ/CO sections).

What are the BPI AC/Heat Pump prerequisites?

You must hold an EPA 40 CFR Section 608 Type II or Universal certification before testing. Submit your EPA cert to BPI prior to scheduling. No specific degree or BPI training is required.

How hard is the BPI AC/Heat Pump exam?

The exam is moderately challenging and requires strong knowledge of HVAC diagnostics including superheat/subcooling calculations, airflow measurement, duct leakage testing, and combustion appliance safety procedures.

What does the field exam cover?

The field exam is a hands-on assessment at a BPI Test Center lasting 2 hours. You must demonstrate proficiency in HVAC diagnostics, refrigerant charge verification, airflow testing, and combustion safety. CAZ/CO sections require 85% to pass.

How long is BPI AC/Heat Pump certification valid?

BPI AC & Heat Pump Professional certification is valid for 3 years. You must recertify by retaking the exams or meeting BPI's continuing education requirements before your certification expires.

Is the BPI AC/Heat Pump exam available online?

The written portion (100 multiple-choice questions) is taken online. However, the field exam must be completed in person at an authorized BPI Test Center.

What HVAC topics should I focus on for the BPI exam?

Focus on refrigerant charge diagnostics (superheat/subcooling), airflow measurement and duct testing, heat pump operation including defrost cycles, combustion appliance zone testing, and ASHRAE 62.2 ventilation requirements.