CT Geothermal HVAC Contractor
Exam Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A| Instant Download Pdf
1. What is the primary advantage of a geothermal heat pump compared to
a conventional air-source heat pump?
A. Lower initial installation cost
B. Easier maintenance
C. Higher energy efficiency and lower operating costs
D. Requires no ductwork
Answer: C
Rationale: Geothermal heat pumps use the stable ground temperature
to provide heating and cooling, resulting in significantly higher
efficiency and lower operating costs compared to air-source heat
pumps.
2. In a closed-loop geothermal system, the fluid circulating through the
ground loop is typically:
A. Air
B. Water or water-antifreeze mixture
C. Refrigerant
D. Oil
Answer: B
Rationale: Closed-loop systems circulate water or a water-antifreeze
mixture to transfer heat to and from the ground efficiently.
3. What type of loop configuration is most commonly used for residential
geothermal systems?
A. Open-loop
B. Horizontal closed-loop
C. Vertical closed-loop
, D. Both B and C
Answer: D
Rationale: Residential systems typically use either horizontal or
vertical closed-loop configurations depending on available land area
and soil conditions.
4. What is the typical depth range for vertical geothermal loops?
A. 10–20 ft
B. 50–100 ft
C. 100–400 ft
D. 200–400 ft
Answer: D
Rationale: Vertical loops are drilled deep to reach stable ground
temperatures, typically between 200 and 400 feet.
5. Which of the following is a disadvantage of open-loop geothermal
systems?
A. Lower efficiency
B. Potential water contamination and higher maintenance
C. Requires less land
D. High refrigerant use
Answer: B
Rationale: Open-loop systems use groundwater directly, which can
introduce contamination risks and require additional maintenance.
6. What is the purpose of the ground loop in a geothermal system?
A. To circulate refrigerant
B. To transfer heat to or from the ground
C. To filter air
D. To dehumidify indoor spaces
Answer: B
Rationale: The ground loop exchanges heat with the earth, allowing
the geothermal system to heat or cool indoor spaces efficiently.
7. Which refrigerant is commonly used in modern geothermal heat
pumps?
A. R-22
B. R-134a
C. R-410A
D. R-12
Answer: C
, Rationale: R-410A is widely used due to its efficiency and compliance
with current environmental standards.
8. What is the typical coefficient of performance (COP) for a geothermal
heat pump in heating mode?
A. 1.5–2.0
B. 2.0–2.5
C. 3.0–5.0
D. 5.5–6.0
Answer: C
Rationale: Geothermal heat pumps often have a COP of 3.0–5.0,
meaning they produce 3–5 units of heat for each unit of electricity
consumed.
9. What is the main factor affecting the efficiency of a geothermal heat
pump?
A. Indoor humidity
B. Ground temperature and loop design
C. Type of thermostat
D. Color of the unit
Answer: B
Rationale: The temperature of the ground and the design of the loop
significantly impact the heat exchange efficiency.
10. Which system component is responsible for circulating water in a
closed-loop geothermal system?
A. Expansion valve
B. Thermostat
C. Circulator pump
D. Compressor
Answer: C
Rationale: The circulator pump moves the water-antifreeze mixture
through the loop to transfer heat.
11. What is the ideal spacing for horizontal ground loops?
A. 2–4 inches
B. 6–12 inches
C. 12–18 inches
D. 10–20 feet
Answer: D
Exam Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A| Instant Download Pdf
1. What is the primary advantage of a geothermal heat pump compared to
a conventional air-source heat pump?
A. Lower initial installation cost
B. Easier maintenance
C. Higher energy efficiency and lower operating costs
D. Requires no ductwork
Answer: C
Rationale: Geothermal heat pumps use the stable ground temperature
to provide heating and cooling, resulting in significantly higher
efficiency and lower operating costs compared to air-source heat
pumps.
2. In a closed-loop geothermal system, the fluid circulating through the
ground loop is typically:
A. Air
B. Water or water-antifreeze mixture
C. Refrigerant
D. Oil
Answer: B
Rationale: Closed-loop systems circulate water or a water-antifreeze
mixture to transfer heat to and from the ground efficiently.
3. What type of loop configuration is most commonly used for residential
geothermal systems?
A. Open-loop
B. Horizontal closed-loop
C. Vertical closed-loop
, D. Both B and C
Answer: D
Rationale: Residential systems typically use either horizontal or
vertical closed-loop configurations depending on available land area
and soil conditions.
4. What is the typical depth range for vertical geothermal loops?
A. 10–20 ft
B. 50–100 ft
C. 100–400 ft
D. 200–400 ft
Answer: D
Rationale: Vertical loops are drilled deep to reach stable ground
temperatures, typically between 200 and 400 feet.
5. Which of the following is a disadvantage of open-loop geothermal
systems?
A. Lower efficiency
B. Potential water contamination and higher maintenance
C. Requires less land
D. High refrigerant use
Answer: B
Rationale: Open-loop systems use groundwater directly, which can
introduce contamination risks and require additional maintenance.
6. What is the purpose of the ground loop in a geothermal system?
A. To circulate refrigerant
B. To transfer heat to or from the ground
C. To filter air
D. To dehumidify indoor spaces
Answer: B
Rationale: The ground loop exchanges heat with the earth, allowing
the geothermal system to heat or cool indoor spaces efficiently.
7. Which refrigerant is commonly used in modern geothermal heat
pumps?
A. R-22
B. R-134a
C. R-410A
D. R-12
Answer: C
, Rationale: R-410A is widely used due to its efficiency and compliance
with current environmental standards.
8. What is the typical coefficient of performance (COP) for a geothermal
heat pump in heating mode?
A. 1.5–2.0
B. 2.0–2.5
C. 3.0–5.0
D. 5.5–6.0
Answer: C
Rationale: Geothermal heat pumps often have a COP of 3.0–5.0,
meaning they produce 3–5 units of heat for each unit of electricity
consumed.
9. What is the main factor affecting the efficiency of a geothermal heat
pump?
A. Indoor humidity
B. Ground temperature and loop design
C. Type of thermostat
D. Color of the unit
Answer: B
Rationale: The temperature of the ground and the design of the loop
significantly impact the heat exchange efficiency.
10. Which system component is responsible for circulating water in a
closed-loop geothermal system?
A. Expansion valve
B. Thermostat
C. Circulator pump
D. Compressor
Answer: C
Rationale: The circulator pump moves the water-antifreeze mixture
through the loop to transfer heat.
11. What is the ideal spacing for horizontal ground loops?
A. 2–4 inches
B. 6–12 inches
C. 12–18 inches
D. 10–20 feet
Answer: D
