NATE HEAT PUMP EXAM WITH CORRECT ANSWERS
2026 GRADED A+ /EXAM PASS GUIDE
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 - 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 - 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 - 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 - 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 - 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 - 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
2026 GRADED A+ /EXAM PASS GUIDE
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 - 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 - 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 - 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 - 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 - 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 - 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
