NATE Heat Pump Exam Latest Update 2025-2026
50 Questions and 100% Verified Correct Answers
Guaranteed A+
A customer is concerned that during the heating season heavy ice builds up on one side
of the concrete equipment pad and coil. The rest of the coil is clear of ice and the heat
pump is meeting the heating needs of the house. What is most likely the cause of the
problem?
A: High winds on that side of the outdoor unit
B: The outdoor unit is not level
C: There is more refrigerant on that side of the coil
D: A defrost problem exists -CORRECT ANSWER: B: The outdoor unit is not level
A heat pump defrosts even when there is no ice on the outside coil. Which of the
following is most likely the problem?
A: The defrost time clock is set for too short a cycle
B: The outdoor coil is dirty and the system uses a pressure differential type of defrost
initiation
C: The sensing bulb of the defrost control is mounted too close to the bottom of the
outdoor coil
D: Each of these could cause the problem -CORRECT ANSWER: D: Each of these
could cause the problem
,A heat pump is operating in the heating mode. The lower the outside air temperature,
the:
A: More efficient the heat pump becomes
B: Higher the SEER rating
C: Higher the compression ratio
D: Lower the balance point -CORRECT ANSWER: C: Higher the compression ratio
A heat pump operating in the cooling mode would be expected to have a return-to-
supply air temperature differential in the range of:
A: 5 to 6 degrees
B: 5 to 8 degrees
C: 8 to 12 degrees
D: 18 to 22 degrees -CORRECT ANSWER: D: 18 to 22 degrees
A heat pump operating normally in the heating mode would be expected to have a
supply air temperature in the range of:
A: 70 to 80 degrees
B: 80 to 90 degrees
, C: 85 to 105 degrees
D: 100 to 130 degrees -CORRECT ANSWER: C: 85 to 105 degrees
A technician places a heat pump into the auxiliary electric heating mode with the
compressor de-energized. He measures a temperature rise between the return and
supply air of 40 degrees. The measured voltage at the electric elements is exactly 222
volts and the measured amperage of the heaters is 60 amps. Using the equation CFM =
BTU divided by 1.08 x TD, what is the CFM of the system?
A: 825 CFM
B: 950 CFM
C: 1055 CFM
D: 1500 CFM -CORRECT ANSWER: C: 1055 CFM
222 x 60 = 13,320watts
13, = 13.32 Kw
btuh = 13.32 x 3415 = 45,488
cfm =((45,488 / (1.08 x 40))
cfm = 45,.2 = 1052.95
A thermistor is an:
A: Electronic temperature sensor that changes its resistance with changes in
temperature
B: Electronic pressure sensor that changes its resistance with changes in pressure
50 Questions and 100% Verified Correct Answers
Guaranteed A+
A customer is concerned that during the heating season heavy ice builds up on one side
of the concrete equipment pad and coil. The rest of the coil is clear of ice and the heat
pump is meeting the heating needs of the house. What is most likely the cause of the
problem?
A: High winds on that side of the outdoor unit
B: The outdoor unit is not level
C: There is more refrigerant on that side of the coil
D: A defrost problem exists -CORRECT ANSWER: B: The outdoor unit is not level
A heat pump defrosts even when there is no ice on the outside coil. Which of the
following is most likely the problem?
A: The defrost time clock is set for too short a cycle
B: The outdoor coil is dirty and the system uses a pressure differential type of defrost
initiation
C: The sensing bulb of the defrost control is mounted too close to the bottom of the
outdoor coil
D: Each of these could cause the problem -CORRECT ANSWER: D: Each of these
could cause the problem
,A heat pump is operating in the heating mode. The lower the outside air temperature,
the:
A: More efficient the heat pump becomes
B: Higher the SEER rating
C: Higher the compression ratio
D: Lower the balance point -CORRECT ANSWER: C: Higher the compression ratio
A heat pump operating in the cooling mode would be expected to have a return-to-
supply air temperature differential in the range of:
A: 5 to 6 degrees
B: 5 to 8 degrees
C: 8 to 12 degrees
D: 18 to 22 degrees -CORRECT ANSWER: D: 18 to 22 degrees
A heat pump operating normally in the heating mode would be expected to have a
supply air temperature in the range of:
A: 70 to 80 degrees
B: 80 to 90 degrees
, C: 85 to 105 degrees
D: 100 to 130 degrees -CORRECT ANSWER: C: 85 to 105 degrees
A technician places a heat pump into the auxiliary electric heating mode with the
compressor de-energized. He measures a temperature rise between the return and
supply air of 40 degrees. The measured voltage at the electric elements is exactly 222
volts and the measured amperage of the heaters is 60 amps. Using the equation CFM =
BTU divided by 1.08 x TD, what is the CFM of the system?
A: 825 CFM
B: 950 CFM
C: 1055 CFM
D: 1500 CFM -CORRECT ANSWER: C: 1055 CFM
222 x 60 = 13,320watts
13, = 13.32 Kw
btuh = 13.32 x 3415 = 45,488
cfm =((45,488 / (1.08 x 40))
cfm = 45,.2 = 1052.95
A thermistor is an:
A: Electronic temperature sensor that changes its resistance with changes in
temperature
B: Electronic pressure sensor that changes its resistance with changes in pressure
