HVAC Gas Heat certification exam
HVAC GAS HEAT CERTIFICATION EXAM LATEST 2025/2026
ACTUAL EXAM COMPLETE QUESTIONS AND CORRECT ANSWERS
GRADED A+ GUARANTEED PASS- ACE YOUR EXAM
A technician is using an extension ladder to work on a rooftop unit. The top of the
ladder should extend _____ beyond the support point
a) 1 foot
b) 2 feet
c) 3 feet
d) 4 feet
e) 5 feet
Correct Answer:
c) 3 feet
A technician determines that a natural gas furnace has a defective heat exchanger.
The technician should
a) Increase combustion air
b) Replace the gas valve
c) Seal visible cracks
d) Adjust manifold pressure
e) Inform the homeowner and turn the gas off
Correct Answer:
e) Inform the homeowner and turn the gas off
A natural gas furnace usually requires _____ gas pressure at the manifold and
burners
1|Page
, HVAC Gas Heat certification exam
a) 2.0 in. W.C.
b) 3.5 in. W.C.
c) 5.0 in. W.C.
d) 7.0 in. W.C.
e) 10.0 in. W.C.
Correct Answer:
b) 3.5 in. W.C.
The vent system for a condensing furnace is classified as ____ by the National Fuel
Gas Code
a) Category I
b) Category II
c) Category III
d) Category IV
e) Direct Vent
Correct Answer:
d) Category IV
Type B vent pipe must be kept at least _____ from combustible materials
a) 1/2 inch
b) One inch
c) 2 inches
d) 3 inches
e) 6 inches
Correct Answer:
b) One inch
Typical condensing furnaces have an AFUE rating of at least
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, HVAC Gas Heat certification exam
a) 80%
b) 82%
c) 85%
d) 88%
e) 90%
Correct Answer:
e) 90%
You have installed a Category IV two-pipe vent system that terminates through the
roof of the residence. The elbow for the combustion air intake, above the roof,
should
a) Point up
b) Point sideways
c) Be capped
d) Point it down
e) Be screened closed
Correct Answer:
d) Point it down
The reason heating thermostats have anticipation is to
a) Increase temperature swing
b) Shorten blower run time
c) Reduce lag
d) Increase firing rate
e) Maintain constant humidity
Correct Answer:
c) Reduce lag
3|Page
, HVAC Gas Heat certification exam
The typical flue gas temperature of a Category III furnace is
a) 120°F – 150°F
b) 180°F – 220°F
c) 280°F – 300°F
d) 350°F – 400°F
e) 450°F – 500°F
Correct Answer:
c) 280°F – 300°F
Natural gas primarily consists of
a) Propane
b) Butane
c) Ethane
d) Methane
e) Hydrogen
Correct Answer:
d) Methane
Burning one cubic foot of natural gas will produce approximately _____ BTUs
a) 500 – 700
b) 700 – 850
c) 900 – 1,100
d) 1,200 – 1,400
e) 1,500 – 1,800
Correct Answer:
c) 900 – 1,100
4|Page
HVAC GAS HEAT CERTIFICATION EXAM LATEST 2025/2026
ACTUAL EXAM COMPLETE QUESTIONS AND CORRECT ANSWERS
GRADED A+ GUARANTEED PASS- ACE YOUR EXAM
A technician is using an extension ladder to work on a rooftop unit. The top of the
ladder should extend _____ beyond the support point
a) 1 foot
b) 2 feet
c) 3 feet
d) 4 feet
e) 5 feet
Correct Answer:
c) 3 feet
A technician determines that a natural gas furnace has a defective heat exchanger.
The technician should
a) Increase combustion air
b) Replace the gas valve
c) Seal visible cracks
d) Adjust manifold pressure
e) Inform the homeowner and turn the gas off
Correct Answer:
e) Inform the homeowner and turn the gas off
A natural gas furnace usually requires _____ gas pressure at the manifold and
burners
1|Page
, HVAC Gas Heat certification exam
a) 2.0 in. W.C.
b) 3.5 in. W.C.
c) 5.0 in. W.C.
d) 7.0 in. W.C.
e) 10.0 in. W.C.
Correct Answer:
b) 3.5 in. W.C.
The vent system for a condensing furnace is classified as ____ by the National Fuel
Gas Code
a) Category I
b) Category II
c) Category III
d) Category IV
e) Direct Vent
Correct Answer:
d) Category IV
Type B vent pipe must be kept at least _____ from combustible materials
a) 1/2 inch
b) One inch
c) 2 inches
d) 3 inches
e) 6 inches
Correct Answer:
b) One inch
Typical condensing furnaces have an AFUE rating of at least
2|Page
, HVAC Gas Heat certification exam
a) 80%
b) 82%
c) 85%
d) 88%
e) 90%
Correct Answer:
e) 90%
You have installed a Category IV two-pipe vent system that terminates through the
roof of the residence. The elbow for the combustion air intake, above the roof,
should
a) Point up
b) Point sideways
c) Be capped
d) Point it down
e) Be screened closed
Correct Answer:
d) Point it down
The reason heating thermostats have anticipation is to
a) Increase temperature swing
b) Shorten blower run time
c) Reduce lag
d) Increase firing rate
e) Maintain constant humidity
Correct Answer:
c) Reduce lag
3|Page
, HVAC Gas Heat certification exam
The typical flue gas temperature of a Category III furnace is
a) 120°F – 150°F
b) 180°F – 220°F
c) 280°F – 300°F
d) 350°F – 400°F
e) 450°F – 500°F
Correct Answer:
c) 280°F – 300°F
Natural gas primarily consists of
a) Propane
b) Butane
c) Ethane
d) Methane
e) Hydrogen
Correct Answer:
d) Methane
Burning one cubic foot of natural gas will produce approximately _____ BTUs
a) 500 – 700
b) 700 – 850
c) 900 – 1,100
d) 1,200 – 1,400
e) 1,500 – 1,800
Correct Answer:
c) 900 – 1,100
4|Page
