NATE Gas Heating Exam Questions and Answers |Fall
2025/2026 Update | 100% Correct
Question 1
Selecting a lower speed tap setting on a furnace indoor blower motor will cause:
A: The temperature rise through the furnace to increase
B: The temperature rise through the furnace to decrease
C: The temperature rise through the furnace will not be affected
D: The furnace to act as a humidifier
Correct Answer
A: The temperature rise through the furnace to increase
Page 1 of 26
,Question 2
The intermittent ignition system:
A: Lights the burner directly
B: Uses a thermocouple
C: Lights the pilot only on a call for heat
D: Is the most efficient ignition system
Correct Answer
C: Lights the pilot only on a call for heat
Question 3
A heat anticipator is wired:
A: In series with the "W" terminal
B: In parallel with the "W" terminal
C: In series with the "R" terminal
D: In parallel with the "R" terminal
Correct Answer
A: In series with the "W" terminal
Page 2 of 26
, Question 4
Secondary heat exchangers:
A: optional heat exchangers used when necessary
B: constructed so return air passes over the secondary heat exchanger first and then over the main heat exchanger
C: used to add more heat to the supply air before entering the sheet metal ducting system
D: now rarely used on the higher efficiency furnaces
Correct Answer
B: constructed so return air passes over the secondary heat exchanger first and then over the main heat exchanger
Question 5
A combination fan-stat and high limit:
A: Are both safety controls
B: Consists of a high temperature safety thermostat built into the wall thermostat
C: Separate switches from a single helical bimetal, one switch controls the indoor fan, the other acting as safety control
D: All the above are correct
Correct Answer
C: Separate switches from a single helical bimetal, one switch controls the indoor fan, the other acting as safety control
Page 3 of 26
2025/2026 Update | 100% Correct
Question 1
Selecting a lower speed tap setting on a furnace indoor blower motor will cause:
A: The temperature rise through the furnace to increase
B: The temperature rise through the furnace to decrease
C: The temperature rise through the furnace will not be affected
D: The furnace to act as a humidifier
Correct Answer
A: The temperature rise through the furnace to increase
Page 1 of 26
,Question 2
The intermittent ignition system:
A: Lights the burner directly
B: Uses a thermocouple
C: Lights the pilot only on a call for heat
D: Is the most efficient ignition system
Correct Answer
C: Lights the pilot only on a call for heat
Question 3
A heat anticipator is wired:
A: In series with the "W" terminal
B: In parallel with the "W" terminal
C: In series with the "R" terminal
D: In parallel with the "R" terminal
Correct Answer
A: In series with the "W" terminal
Page 2 of 26
, Question 4
Secondary heat exchangers:
A: optional heat exchangers used when necessary
B: constructed so return air passes over the secondary heat exchanger first and then over the main heat exchanger
C: used to add more heat to the supply air before entering the sheet metal ducting system
D: now rarely used on the higher efficiency furnaces
Correct Answer
B: constructed so return air passes over the secondary heat exchanger first and then over the main heat exchanger
Question 5
A combination fan-stat and high limit:
A: Are both safety controls
B: Consists of a high temperature safety thermostat built into the wall thermostat
C: Separate switches from a single helical bimetal, one switch controls the indoor fan, the other acting as safety control
D: All the above are correct
Correct Answer
C: Separate switches from a single helical bimetal, one switch controls the indoor fan, the other acting as safety control
Page 3 of 26
