NATE Gas & Heat Exam 2025 – HVAC Gas Heating Professional Certification Guide|| GRADED A+|| LATEST UPDATE 2026/27

NATE Gas & Heat Exam 2025 – HVAC Gas Heating
Professional Certification Guide|| GRADED A+||
LATEST UPDATE 2026/27

Since 1992, the United States Department of Energy has required that all furnaces sold

and installed from that date on must have an AFUE of no less than:



A: 70%



B: 75%



C: 78%



D: 80% -CORRECTANSWER C: 78%



Many pre-1992 furnaces have efficiencies around .



A: 10%



B: 40%



C: 60%



D: 80% -CORRECTANSWER C: 60%

,Today, furnaces with AFUE ratings greater than are available.



A: 85%



B: 90%



C: 100%



D: 110% -CORRECTANSWER B: 90%



A thermocouple is used with:



A: Intermittent pilot systems



B: Direct spark ignition systems



C: Glow coil ignition systems



D: Standing pilot ignition systems -CORRECTANSWER D: Standing pilot ignition

systems



The purpose of the gas pressure regulator is to:

, A: Keep the color of the flame constant



B: Keep the high limit switch from tripping



C: Maintain a constant gas pressure at the burner



D: Allow the gas valve to operate smoothly and accurately -CORRECTANSWER C:

Maintain a constant gas pressure at the burner



The instrument used to measure outlet gas pressure is the:



A: Velometer



B: Anemometer



C: Monometer



D: Draft gauge -CORRECTANSWER C: Monometer



The regulator on a natural gas furnace should be adjusted to supply inches of

pressure at the burners.