HVAC Final EXAM Newest 2026 Complete Questions and
Correct Detailed Answers (Verified Answers) Already Graded
A+
About This Exam Bank
This comprehensive 150-question exam bank is designed to prepare candidates for HVAC Final EXAM Newest
2026 Complete Questions and Correct Detailed Answers (Verified Answers) Already Graded A+. Every question is
aligned with the latest official content outline and includes a detailed, evidence-based rationale, an explanation of
why each remaining option is incorrect, and a supporting reference.
Keywords
HVAC Final EXAM Newest 2026 Complete Questions and Correct Detailed Answers (Verified Answers) Already
Graded A+, exam bank, practice questions, verified answers, detailed rationales, test prep, study guide, review
questions, certification exam, latest update, HVAC Final EXAM Newest 2026 Complete Questions and Correct
Detailed Answers (Verified Answers) Already Graded A+, exam bank, practice questions, verified answers, detailed
rationales
PART 1: APPLY ASHRAE 62
1. Which psychrometric process occurs when air is cooled below its dew point in a cooling coil?
A) Sensible cooling only
B) Dehumidification with sensible cooling
C) Humidification with sensible heating
D) Evaporative cooling
' Correct Answer: B
Rationale: Cooling below dew point removes moisture (latent heat) and lowers dry-bulb temperature (sensible
heat). Sensible cooling alone occurs above dew point; humidification adds moisture; evaporative cooling increases
humidity.
2. A duct system has a total equivalent length of 200 ft and 0.08 in. w.g. friction loss per 100 ft. What is total friction
loss?
A) 0.08 in. w.g.
B) 0.16 in. w.g.
C) 0.24 in. w.g.
D) 0.32 in. w.g.
' Correct Answer: B
Rationale: Friction loss = (200/100) × 0.08 = 0.16 in. w.g. Other options result from miscalculating the ratio or
adding extra length.
3. In a refrigeration cycle, which component separates high-pressure liquid from low-pressure vapor?
A) Compressor
B) Condenser
C) Expansion valve
D) Evaporator
' Correct Answer: C
Page 1
,Rationale: The expansion valve (metering device) reduces pressure and separates high-pressure liquid from
low-pressure vapor. Compressor raises pressure; condenser rejects heat; evaporator absorbs heat.
4. What is the minimum outdoor air intake rate for a 1,000 ft² office per ASHRAE 62.1?
A) 5 cfm/person
B) 10 cfm/person
C) 15 cfm/person
D) 20 cfm/person
' Correct Answer: B
Rationale: ASHRAE 62.1 default for office space is 5 cfm/person plus 0.06 cfm/ft², but typical simplified value is
10 cfm/person for combined outdoor air. Other values are either too low or too high for standard office occupancy.
5. Which motor type is most suitable for a variable-speed blower requiring high starting torque?
A) Shaded-pole
B) Permanent split capacitor
C) Electronically commutated motor (ECM)
D) Split-phase
' Correct Answer: C
Rationale: ECM provides high efficiency and high starting torque with variable speed control. Shaded-pole and
split-phase have low starting torque; PSC has moderate torque but not as efficient.
6. A technician measures superheat of 2°F on a TXV system. What is the most likely cause?
A) Undercharged system
B) Overcharged system
C) TXV stuck open
D) Restricted liquid line
' Correct Answer: C
Rationale: Low superheat indicates too much refrigerant entering evaporator, often from a stuck-open TXV.
Undercharge or restriction would cause high superheat; overcharge affects subcooling more.
7. Which heat pump component reverses refrigerant flow for defrost or cooling mode?
A) Reversing valve
B) Check valve
C) Expansion valve
D) Accumulator
' Correct Answer: A
Rationale: The reversing valve changes refrigerant direction, allowing heat pump to switch between heating and
cooling. Check valves and expansion valves do not reverse flow; accumulator stores excess liquid.
8. What is the required minimum SEER2 rating for new residential central air conditioners in the U.S. as of 2023?
A) 13.0
B) 14.0
C) 14.3
D) 15.0
' Correct Answer: C
Rationale: DOE 2023 standards require SEER2 14.3 for split systems in most regions. SEER 13 is obsolete; 14.0
and 15.0 are either old or higher than minimum.
Page 2
,9. Which sensor is used to detect refrigerant leaks by monitoring concentration in air?
A) Thermistor
B) Pressure transducer
C) Infrared refrigerant sensor
D) Humidity sensor
' Correct Answer: C
Rationale: Infrared sensors detect specific refrigerant molecules in air. Thermistors measure temperature; pressure
transducers measure pressure; humidity sensors measure moisture.
10. In a balanced ventilation system, what is the primary purpose of an energy recovery ventilator (ERV)?
A) Filter airborne particles
B) Transfer heat and moisture between exhaust and supply air
C) Increase static pressure
D) Reduce duct noise
' Correct Answer: B
Rationale: ERVs recover both sensible and latent energy, improving efficiency and indoor humidity control. Filters
remove particles; static pressure and noise are unrelated to ERV core function.
11. A 20-ton R-410A packaged unit has a 12°F subcooling and 28°F superheat. Which diagnosis best fits?
A) Overcharge with a restricted liquid line
B) Undercharge with a restricted metering device
C) Normal charge with a dirty evaporator coil
D) Undercharge with a flooded evaporator
' Correct Answer: A
Rationale: Excess subcooling (12°F) indicates overcharge or liquid-line restriction, while elevated superheat (28°F)
suggests a starved evaporator from a restriction; together they point to overcharge plus restriction. Undercharge
would lower subcooling, and normal charge with a dirty coil would show low superheat, not high. A flooded
evaporator would produce near-zero superheat.
12. Per ASHRAE 62.1-2022, which ventilation strategy most effectively reduces outdoor air intake while
maintaining IAQ?
A) Demand-controlled ventilation with CO sensors
B) Constant-volume fixed outdoor air fraction
C) Economizer cycle with enthalpy control
D) Exhaust-only ventilation with makeup air
' Correct Answer: A
Rationale: ASHRAE 62.1-2022 recognizes demand-controlled ventilation (DCV) with CO ‚ sensors as a method to
modulate outdoor air based on occupancy, reducing intake while preserving IAQ. Fixed outdoor air fraction and
exhaust-only systems do not reduce intake dynamically, and economizer cycles increase outdoor air for free cooling,
not reduce it.
13. A duct system delivers 1200 CFM through a 12" round duct. What is the approximate velocity pressure?
A) 0.25 in. w.g.
B) 0.50 in. w.g.
C) 0.75 in. w.g.
D) 1.00 in. w.g.
' Correct Answer: A
Page 3
, Rationale: Velocity = 1200 CFM / (À × (0.5 ft)²) "H 1528 ft/min. Velocity pressure = (1528/4005)² "H 0.15 in. w.g.,
closest to 0.25 in. w.g. among the options. Options B, C, and D overestimate the pressure, as they correspond to
higher velocities.
14. Which component in a refrigeration cycle increases refrigerant pressure and temperature while enabling heat
rejection?
A) Evaporator
B) Compressor
C) Expansion valve
D) Condenser
' Correct Answer: B
Rationale: The compressor raises refrigerant pressure and temperature, allowing heat rejection in the condenser.
The evaporator absorbs heat, the expansion valve reduces pressure, and the condenser rejects heat but does not
increase pressure.
15. A 5-ton unit with a 10 SEER is replaced by a 16 SEER unit. What is the approximate annual energy savings?
A) 20%
B) 37.5%
C) 50%
D) 60%
' Correct Answer: B
Rationale: Efficiency improvement = (16-10)/16 = 37.5% reduction in energy use for the same cooling output.
Options A, C, and D are incorrect because they do not reflect the proportional relationship between SEER and
energy consumption.
16. Per EPA Section 608, which refrigerant handling practice is required when recovering refrigerant from a system
with a charge less than 5 pounds?
A) Recovery is not required if the system is being repaired.
B) Recovery must achieve 90% evacuation or 4 inches of vacuum.
C) Refrigerant may be vented if it is R-410A.
D) Recovery is required only for appliances with 50 pounds or more.
' Correct Answer: B
Rationale: EPA Section 608 requires recovery to specific vacuum levels (e.g., 4 inches of vacuum for small
appliances) regardless of charge size when servicing. Venting is prohibited for all ozone-depleting and substitute
refrigerants, and recovery is required for any charge size.
17. In a variable air volume (VAV) system, which control sequence maintains space temperature while minimizing
fan energy?
A) Constant static pressure with inlet guide vanes
B) Variable static pressure with VFD and demand-based reset
C) Constant volume with reheat
D) Dual duct with constant volume
' Correct Answer: B
Rationale: Variable static pressure control with a VFD and demand-based reset reduces fan speed and energy
during part-load conditions. Constant static pressure, constant volume, and dual duct systems do not optimize fan
energy as effectively.
18. Which load calculation method per ACCA Manual J accounts for infiltration and duct losses?
Page 4
Correct Detailed Answers (Verified Answers) Already Graded
A+
About This Exam Bank
This comprehensive 150-question exam bank is designed to prepare candidates for HVAC Final EXAM Newest
2026 Complete Questions and Correct Detailed Answers (Verified Answers) Already Graded A+. Every question is
aligned with the latest official content outline and includes a detailed, evidence-based rationale, an explanation of
why each remaining option is incorrect, and a supporting reference.
Keywords
HVAC Final EXAM Newest 2026 Complete Questions and Correct Detailed Answers (Verified Answers) Already
Graded A+, exam bank, practice questions, verified answers, detailed rationales, test prep, study guide, review
questions, certification exam, latest update, HVAC Final EXAM Newest 2026 Complete Questions and Correct
Detailed Answers (Verified Answers) Already Graded A+, exam bank, practice questions, verified answers, detailed
rationales
PART 1: APPLY ASHRAE 62
1. Which psychrometric process occurs when air is cooled below its dew point in a cooling coil?
A) Sensible cooling only
B) Dehumidification with sensible cooling
C) Humidification with sensible heating
D) Evaporative cooling
' Correct Answer: B
Rationale: Cooling below dew point removes moisture (latent heat) and lowers dry-bulb temperature (sensible
heat). Sensible cooling alone occurs above dew point; humidification adds moisture; evaporative cooling increases
humidity.
2. A duct system has a total equivalent length of 200 ft and 0.08 in. w.g. friction loss per 100 ft. What is total friction
loss?
A) 0.08 in. w.g.
B) 0.16 in. w.g.
C) 0.24 in. w.g.
D) 0.32 in. w.g.
' Correct Answer: B
Rationale: Friction loss = (200/100) × 0.08 = 0.16 in. w.g. Other options result from miscalculating the ratio or
adding extra length.
3. In a refrigeration cycle, which component separates high-pressure liquid from low-pressure vapor?
A) Compressor
B) Condenser
C) Expansion valve
D) Evaporator
' Correct Answer: C
Page 1
,Rationale: The expansion valve (metering device) reduces pressure and separates high-pressure liquid from
low-pressure vapor. Compressor raises pressure; condenser rejects heat; evaporator absorbs heat.
4. What is the minimum outdoor air intake rate for a 1,000 ft² office per ASHRAE 62.1?
A) 5 cfm/person
B) 10 cfm/person
C) 15 cfm/person
D) 20 cfm/person
' Correct Answer: B
Rationale: ASHRAE 62.1 default for office space is 5 cfm/person plus 0.06 cfm/ft², but typical simplified value is
10 cfm/person for combined outdoor air. Other values are either too low or too high for standard office occupancy.
5. Which motor type is most suitable for a variable-speed blower requiring high starting torque?
A) Shaded-pole
B) Permanent split capacitor
C) Electronically commutated motor (ECM)
D) Split-phase
' Correct Answer: C
Rationale: ECM provides high efficiency and high starting torque with variable speed control. Shaded-pole and
split-phase have low starting torque; PSC has moderate torque but not as efficient.
6. A technician measures superheat of 2°F on a TXV system. What is the most likely cause?
A) Undercharged system
B) Overcharged system
C) TXV stuck open
D) Restricted liquid line
' Correct Answer: C
Rationale: Low superheat indicates too much refrigerant entering evaporator, often from a stuck-open TXV.
Undercharge or restriction would cause high superheat; overcharge affects subcooling more.
7. Which heat pump component reverses refrigerant flow for defrost or cooling mode?
A) Reversing valve
B) Check valve
C) Expansion valve
D) Accumulator
' Correct Answer: A
Rationale: The reversing valve changes refrigerant direction, allowing heat pump to switch between heating and
cooling. Check valves and expansion valves do not reverse flow; accumulator stores excess liquid.
8. What is the required minimum SEER2 rating for new residential central air conditioners in the U.S. as of 2023?
A) 13.0
B) 14.0
C) 14.3
D) 15.0
' Correct Answer: C
Rationale: DOE 2023 standards require SEER2 14.3 for split systems in most regions. SEER 13 is obsolete; 14.0
and 15.0 are either old or higher than minimum.
Page 2
,9. Which sensor is used to detect refrigerant leaks by monitoring concentration in air?
A) Thermistor
B) Pressure transducer
C) Infrared refrigerant sensor
D) Humidity sensor
' Correct Answer: C
Rationale: Infrared sensors detect specific refrigerant molecules in air. Thermistors measure temperature; pressure
transducers measure pressure; humidity sensors measure moisture.
10. In a balanced ventilation system, what is the primary purpose of an energy recovery ventilator (ERV)?
A) Filter airborne particles
B) Transfer heat and moisture between exhaust and supply air
C) Increase static pressure
D) Reduce duct noise
' Correct Answer: B
Rationale: ERVs recover both sensible and latent energy, improving efficiency and indoor humidity control. Filters
remove particles; static pressure and noise are unrelated to ERV core function.
11. A 20-ton R-410A packaged unit has a 12°F subcooling and 28°F superheat. Which diagnosis best fits?
A) Overcharge with a restricted liquid line
B) Undercharge with a restricted metering device
C) Normal charge with a dirty evaporator coil
D) Undercharge with a flooded evaporator
' Correct Answer: A
Rationale: Excess subcooling (12°F) indicates overcharge or liquid-line restriction, while elevated superheat (28°F)
suggests a starved evaporator from a restriction; together they point to overcharge plus restriction. Undercharge
would lower subcooling, and normal charge with a dirty coil would show low superheat, not high. A flooded
evaporator would produce near-zero superheat.
12. Per ASHRAE 62.1-2022, which ventilation strategy most effectively reduces outdoor air intake while
maintaining IAQ?
A) Demand-controlled ventilation with CO sensors
B) Constant-volume fixed outdoor air fraction
C) Economizer cycle with enthalpy control
D) Exhaust-only ventilation with makeup air
' Correct Answer: A
Rationale: ASHRAE 62.1-2022 recognizes demand-controlled ventilation (DCV) with CO ‚ sensors as a method to
modulate outdoor air based on occupancy, reducing intake while preserving IAQ. Fixed outdoor air fraction and
exhaust-only systems do not reduce intake dynamically, and economizer cycles increase outdoor air for free cooling,
not reduce it.
13. A duct system delivers 1200 CFM through a 12" round duct. What is the approximate velocity pressure?
A) 0.25 in. w.g.
B) 0.50 in. w.g.
C) 0.75 in. w.g.
D) 1.00 in. w.g.
' Correct Answer: A
Page 3
, Rationale: Velocity = 1200 CFM / (À × (0.5 ft)²) "H 1528 ft/min. Velocity pressure = (1528/4005)² "H 0.15 in. w.g.,
closest to 0.25 in. w.g. among the options. Options B, C, and D overestimate the pressure, as they correspond to
higher velocities.
14. Which component in a refrigeration cycle increases refrigerant pressure and temperature while enabling heat
rejection?
A) Evaporator
B) Compressor
C) Expansion valve
D) Condenser
' Correct Answer: B
Rationale: The compressor raises refrigerant pressure and temperature, allowing heat rejection in the condenser.
The evaporator absorbs heat, the expansion valve reduces pressure, and the condenser rejects heat but does not
increase pressure.
15. A 5-ton unit with a 10 SEER is replaced by a 16 SEER unit. What is the approximate annual energy savings?
A) 20%
B) 37.5%
C) 50%
D) 60%
' Correct Answer: B
Rationale: Efficiency improvement = (16-10)/16 = 37.5% reduction in energy use for the same cooling output.
Options A, C, and D are incorrect because they do not reflect the proportional relationship between SEER and
energy consumption.
16. Per EPA Section 608, which refrigerant handling practice is required when recovering refrigerant from a system
with a charge less than 5 pounds?
A) Recovery is not required if the system is being repaired.
B) Recovery must achieve 90% evacuation or 4 inches of vacuum.
C) Refrigerant may be vented if it is R-410A.
D) Recovery is required only for appliances with 50 pounds or more.
' Correct Answer: B
Rationale: EPA Section 608 requires recovery to specific vacuum levels (e.g., 4 inches of vacuum for small
appliances) regardless of charge size when servicing. Venting is prohibited for all ozone-depleting and substitute
refrigerants, and recovery is required for any charge size.
17. In a variable air volume (VAV) system, which control sequence maintains space temperature while minimizing
fan energy?
A) Constant static pressure with inlet guide vanes
B) Variable static pressure with VFD and demand-based reset
C) Constant volume with reheat
D) Dual duct with constant volume
' Correct Answer: B
Rationale: Variable static pressure control with a VFD and demand-based reset reduces fan speed and energy
during part-load conditions. Constant static pressure, constant volume, and dual duct systems do not optimize fan
energy as effectively.
18. Which load calculation method per ACCA Manual J accounts for infiltration and duct losses?
Page 4
