ASHRAE Energy Efficiency Systems
Evaluation Module Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary objective of energy efficiency in HVAC system
design?
A. Increase equipment size for redundancy
B. Minimize energy consumption while maintaining comfort and
indoor air quality
C. Maximize airflow regardless of demand
D. Eliminate the use of automation systems
B. Minimize energy consumption while maintaining comfort and
indoor air quality
Energy efficiency in HVAC design focuses on reducing energy use
while ensuring thermal comfort, acceptable indoor air quality, and
system reliability are maintained.
,2. Which HVAC system component most directly influences part-load
efficiency?
A. Cooling tower basin
B. Variable speed drive
C. Duct insulation
D. Air diffuser
B. Variable speed drive
Variable speed drives improve part-load efficiency by allowing
motors to adjust output based on demand rather than running at full
speed continuously.
3. What is the purpose of economizer cycles in HVAC systems?
A. Increase compressor runtime
B. Use outdoor air for free cooling when conditions permit
C. Increase refrigerant charge
D. Reduce ventilation requirements
B. Use outdoor air for free cooling when conditions permit
Economizers reduce mechanical cooling loads by using cool outdoor
air when environmental conditions are favorable.
4. Which metric is commonly used to evaluate building energy
performance?
A. BTU per ton-hour
B. Energy Use Intensity (EUI)
C. Static pressure drop
, D. Sensible heat ratio
B. Energy Use Intensity (EUI)
EUI measures annual energy consumption per unit floor area,
allowing comparison of building efficiency.
5. Which control strategy best improves energy efficiency in variable air
volume (VAV) systems?
A. Constant air volume operation
B. Resetting supply air temperature based on load
C. Running fans at maximum speed continuously
D. Increasing minimum airflow settings
B. Resetting supply air temperature based on load
Supply air temperature reset reduces reheat and fan energy by
matching system output to actual demand.
6. What is the primary benefit of demand-controlled ventilation?
A. Increased outdoor air at all times
B. Reduced ventilation during low occupancy
C. Constant exhaust air volume
D. Higher cooling coil loads
B. Reduced ventilation during low occupancy
Demand-controlled ventilation adjusts fresh air intake based on
occupancy, reducing unnecessary conditioning of outdoor air.
7. Which system typically provides the highest part-load efficiency?
A. Constant speed chiller system
, B. Variable speed chiller plant
C. Electric resistance heating system
D. Oversized boiler system
B. Variable speed chiller plant
Variable speed chillers adjust capacity to match load, improving
efficiency at partial loads.
8. What does COP (Coefficient of Performance) measure?
A. Airflow rate per ton
B. Cooling capacity per unit of electrical input
C. Refrigerant leakage rate
D. Fan efficiency only
B. Cooling capacity per unit of electrical input
COP expresses system efficiency by comparing useful heating or
cooling output to energy input.
9. Which factor most increases HVAC system energy consumption?
A. Proper insulation
B. Equipment oversizing
C. Variable speed control
D. Heat recovery systems
B. Equipment oversizing
Oversized equipment cycles inefficiently, increasing energy use and
reducing system performance.
Evaluation Module Exam Practice
Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary objective of energy efficiency in HVAC system
design?
A. Increase equipment size for redundancy
B. Minimize energy consumption while maintaining comfort and
indoor air quality
C. Maximize airflow regardless of demand
D. Eliminate the use of automation systems
B. Minimize energy consumption while maintaining comfort and
indoor air quality
Energy efficiency in HVAC design focuses on reducing energy use
while ensuring thermal comfort, acceptable indoor air quality, and
system reliability are maintained.
,2. Which HVAC system component most directly influences part-load
efficiency?
A. Cooling tower basin
B. Variable speed drive
C. Duct insulation
D. Air diffuser
B. Variable speed drive
Variable speed drives improve part-load efficiency by allowing
motors to adjust output based on demand rather than running at full
speed continuously.
3. What is the purpose of economizer cycles in HVAC systems?
A. Increase compressor runtime
B. Use outdoor air for free cooling when conditions permit
C. Increase refrigerant charge
D. Reduce ventilation requirements
B. Use outdoor air for free cooling when conditions permit
Economizers reduce mechanical cooling loads by using cool outdoor
air when environmental conditions are favorable.
4. Which metric is commonly used to evaluate building energy
performance?
A. BTU per ton-hour
B. Energy Use Intensity (EUI)
C. Static pressure drop
, D. Sensible heat ratio
B. Energy Use Intensity (EUI)
EUI measures annual energy consumption per unit floor area,
allowing comparison of building efficiency.
5. Which control strategy best improves energy efficiency in variable air
volume (VAV) systems?
A. Constant air volume operation
B. Resetting supply air temperature based on load
C. Running fans at maximum speed continuously
D. Increasing minimum airflow settings
B. Resetting supply air temperature based on load
Supply air temperature reset reduces reheat and fan energy by
matching system output to actual demand.
6. What is the primary benefit of demand-controlled ventilation?
A. Increased outdoor air at all times
B. Reduced ventilation during low occupancy
C. Constant exhaust air volume
D. Higher cooling coil loads
B. Reduced ventilation during low occupancy
Demand-controlled ventilation adjusts fresh air intake based on
occupancy, reducing unnecessary conditioning of outdoor air.
7. Which system typically provides the highest part-load efficiency?
A. Constant speed chiller system
, B. Variable speed chiller plant
C. Electric resistance heating system
D. Oversized boiler system
B. Variable speed chiller plant
Variable speed chillers adjust capacity to match load, improving
efficiency at partial loads.
8. What does COP (Coefficient of Performance) measure?
A. Airflow rate per ton
B. Cooling capacity per unit of electrical input
C. Refrigerant leakage rate
D. Fan efficiency only
B. Cooling capacity per unit of electrical input
COP expresses system efficiency by comparing useful heating or
cooling output to energy input.
9. Which factor most increases HVAC system energy consumption?
A. Proper insulation
B. Equipment oversizing
C. Variable speed control
D. Heat recovery systems
B. Equipment oversizing
Oversized equipment cycles inefficiently, increasing energy use and
reducing system performance.
