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10/6/25, 5:54 AM NATE AC Service Certification Exam fully solved & updated 2025-2026(latest version verified for accuracy) | 2024\2025 Latest!! Fla…




NATE AC Service Certification Exam fully solved
& updated 2025-2026(latest version verified for
accuracy) | 2024\2025 Latest!!

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A system is supplied from D. 6 pounds
the factory with charge of
5 pounds 10 ounces for a 15ft - 25ft = 10ft x .6 = 6 ounces
15 foot line set. The line set 5 pounds + 10 ounces + 6 ounces
is 25 feet long. The 5 pounds + 16 ounces = 6 pounds
manufacturer's instruction
sheet specifies 0.6 ounces
of refrigeration to be
added for each added
foot of refrigerant line set
length. What is the total
refrigerant charge for the
system?


A. 6 ounces
B. 5 pounds
C. 5 pounds 10 ounces
D. 6 pounds




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The purpose of using flux C. reduce oxidation.
when soldering is to:


A. anneal the surface.
B. give better heat flow.
C. reduce oxidation.
D. pre-seal the oxidation.

Outdoor condensing units A. be mounted above flood level.
that are installed in areas
where flooding is possible
must:


A. be mounted above
flood level.
B. utilize NEMA 1
enclosures.
C. be mounted under an
overhanging eave.
D. use water resistant
components.

The component used to A. curb gasket.
reduce sound transmission
and prevent water leaks
on a rooftop air
conditioner packaged unit
installation is the:


A. curb gasket.
B. silicone caulk.
C. roof flashing.
D. roofing tar.




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Return air leakage in a hot B. Decrease capacity
attic will:


A. Increase capacity
B. Decrease capacity
C. Increase airflow
D. Decrease airflow

An air conditioner C. 500 microns.
refrigerant circuit should
be evacuated to a
minimum of:


A. 0 microns.
B. 200 microns.
C. 500 microns.
D. 1200 microns.

Which of the following D. Carbon Dioxide
substances could create
an extremely dangerous
condition if used to check
refrigeration system for
leaks?


A. R-22
B. Nitrogen
C. Oxygen
D. Carbon Dioxide




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The subcooling method B. Any thermostatic expansion valve
for checking charge is
generally used on air
conditioners with what
type of metering?


A. Only externally
equalized thermostatic
expansion valves
B. Any thermostatic
expansion valve
C. Piston type
D. Any fixed metering
device

Supply ducts running C. a vapor barrier.
through unconditioned
space should be insulated
and have:


A. equal friction.
B. excessive air velocity.
C. a vapor barrier.
D. a transition backing.




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