Free practice test
Free HVAC Practice Test
Take our free HVAC practice test with 20 questions covering EPA 608, refrigeration, and heating systems. Instant scoring with answer explanations.
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This free HVAC practice test includes 20 multiple-choice questions drawn from the subject areas covered on EPA 608 certification, NATE, and journeyman HVAC licensing exams. Topics include refrigerant regulations, the refrigeration cycle, superheat and subcooling, gas furnace operation, venting, and combustion safety.
After you submit, you will see your score, the correct answer for each question, and a plain-English explanation. Use missed questions to identify the areas you need to review before your exam.
These questions are for study practice only and are not official exam questions. ExamsLib is not an official licensing or certification authority. Passing this practice test does not guarantee a passing score on any certification or licensing exam.
These questions are for study practice only and are not official exam questions.
Question 1
Question 2
A condensing gas furnace produces liquid condensate in its secondary heat exchanger. Where should this condensate drain, and what safety device confirms proper combustion airflow before ignition?
Question 3
Which EPA 608 certification type covers technicians who service small appliances containing five pounds or less of refrigerant, such as household refrigerators and window AC units?
Question 4
A heat pump in heating mode shows a suction pressure of 60 psig and a discharge pressure of 400 psig using R-410A. The outdoor ambient temperature is 35 degrees F. The outdoor coil saturation temperature at 60 psig is 20 degrees F. What is the outdoor coil temperature difference (TD), and is this reading normal?
Question 5
What does the AFUE rating measure on a gas furnace?
Question 6
What color is the standard low-pressure side (suction) hose on a refrigerant manifold gauge set?
Question 7
A technician recovers refrigerant from a large commercial chiller using R-123. After recovery, what vacuum level must be achieved, and which EPA 608 type covers this equipment?
Question 8
Which thermostat terminal is typically used to energize the air handler fan independently, such as when the occupant selects 'Fan On' on a 24-volt thermostat system?
Question 9
In a heat pump system, what is the purpose of the reversing valve?
Question 10
What does the term 'recycling' mean in the context of refrigerant handling under EPA 608?
Question 11
A compressor discharge temperature on an R-22 system reads 220 degrees F. What is the most likely cause, and what is the potential consequence if left uncorrected?
Question 12
A residential forced-air system moves 1,200 CFM of air. The supply air temperature is 120 degrees F and the return air temperature is 70 degrees F. Using the sensible heat formula Q = 1.08 x CFM x delta-T, what is the system's heating output in BTU/hr?
Question 13
A technician finds a system leaking refrigerant. Under EPA Section 608, what is the maximum allowable annual leak rate for a commercial refrigeration system holding more than 50 pounds of refrigerant before repair is required?
Question 14
A technician performs a combustion analysis on a natural gas furnace and measures a stack temperature of 400 degrees F on a furnace rated at 80% AFUE under normal conditions. What does the elevated stack temperature suggest about actual seasonal efficiency?
Question 15
During refrigerant recovery from a system with a hermetic compressor larger than 200 horsepower, what is the required vacuum level (inches of mercury) before the system is considered recovered, assuming the recovery machine was manufactured after November 15, 1993?
Question 16
In the basic refrigeration cycle, which component absorbs heat from the conditioned space and causes the refrigerant to evaporate?
Question 17
A technician measures total external static pressure in a forced-air duct system and reads 0.85 inches water column (in. WC) against a blower rated for 0.50 in. WC. What is the most likely result, and what corrective steps should the technician take?
Question 18
What is the primary purpose of recovering refrigerant before opening an HVAC system for repair?
Question 19
Which type of metering device delivers a fixed orifice flow determined solely by the pressure differential across it, with no moving parts?
Question 20
Which refrigerant is classified as an HFC and has zero ozone depletion potential (ODP)?
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Frequently asked questions
What topics does this HVAC practice test cover?
The practice test covers EPA 608 refrigerant regulations, the basic refrigeration cycle, superheat and subcooling diagnostics, metering devices, heat pump operation, gas furnace ignition sequences, heat exchanger safety, combustion analysis, and venting categories.
Is this practice test the same as the real EPA 608 exam?
No. These questions are for study practice only and are not official exam questions from the EPA or any approved testing organization. ExamsLib is not an official certification authority. Always take the certification exam through an EPA-approved testing organization.
How many questions are on the practice test?
This free practice test contains 20 multiple-choice questions. A passing score for practice purposes is 70 percent or better (14 out of 20 questions correct).
Can I retake the practice test?
Yes. You can take the practice test as many times as you need. A different set of questions may be assembled from the question bank on each attempt.
Do I need an account to take the practice test?
No account or login is required. The practice test is completely free and your results are saved locally in your browser.
