InterNACHI Heating, Ventilation, and Air Conditioning (HVAC) Practice Exam

Browse all practice questions for the InterNACHI Heating, Ventilation, and Air Conditioning (HVAC) Practice Exam. Search by topic, open any question and review its full explanation, then test yourself in the practice quiz.

Start practice testFlash cards
InterNACHI Heating, Ventilation, and Air Conditioning (HVAC) Practice Exam 2026 - Free HVAC Practice Questions and Study Guide course image
Barometric Dampers and Their Role in HVAC InspectionsBarometric dampers are often found to be operational during an inspection.Does the larger refrigerant line refer to the return line?Is the larger refrigerant line referred to as the return line?High-efficiency boilers and their fuel supply issuesDo high-efficiency boilers often encounter issues with the fuel supply and burner?How Forced Draft Oil Burners Enhance Combustion Efficiency in Conventional FurnacesOil burners in conventional oil furnaces operate on which type of draft?Is Excessive Length a Common Problem with Oil Furnace Vent Connectors?Excessive length is a common problem with oil furnace vent connectors. True or False?Regular Checks for Safe Gas Furnace OperationWhat should be regularly checked in a gas furnace to prevent dangerous conditions?Understand the Key Factors That Affect Heating System EfficiencyWhich of the following can affect the efficiency of a heating system?Understanding Heat Transfer Methods in Hydronic SystemsHydronic distribution systems use ________ as methods of heat transfer.Understanding High-Efficiency Gas Furnaces and AFUE RatingsHigh-efficiency gas furnaces have AFUE ratings of what percentage and greater?Understanding Natural Gas Combustion Products and Ferrous OxideWhich of the following is not a normal combustion product of natural gas?Understanding Radiators and Their Role in Boiler Heating SystemsIs it true that a radiator is a style of heat delivery that is used with boilers?Understanding the Common Problems with Water-Cooled CoilsWhat is a common problem associated with water-cooled coils?Understanding the Commonality of Ignition Failures in High-Efficiency BoilersIs ignition failure a common issue with high-efficiency boilers?Understanding the Location of the Evaporator Coil in HVAC SystemsWhere is the evaporator coil located in a split system?Understanding the Low Temperature Limit in BoilersFor which of the following devices is the setting of 140° F typically used as a low temperature limit?Understanding the Outdoor Unit's Key Role in Your Air-Conditioning SystemWhat role does the outdoor unit play in an air-conditioning system?Understanding the Primary Control in Hydronic SystemsIs the primary control an operating control found on a hydronic system?Understanding the Risks of Incomplete Combustion of Natural GasWhat is produced from incomplete combustion of natural gas?What Prevents Oil Buildup in Your Furnace's Combustion Chamber?Which component prevents oil accumulation in the combustion chamber of an oil furnace?What Role Does the Heat Exchanger Play in Your HVAC System?Which component acts as a barrier between hot combustion gases and circulating air in a furnace?What You Need to Know About Closed Boiler Systems and CirculatorsWhat is a necessary feature of closed boiler systems?Where Can You Find the Compressor on a Heat Pump?Where may the compressor on a heat pump be located?Where's the Best Spot for Your Radiator?Where should a radiator be installed in a room?Why Does Rust Appear on Your Furnace Fan?The following are all causes of rust on the furnace fan except __________.Why Testing Automatic Safety Controls is Crucial for HVAC SystemsShould automatic safety controls be tested during an HVAC inspection?Why the Size of a Pressure-Relief Valve Matters in HVAC SystemsA pressure-relief valve may be too small for which component?
More practice questions

These questions are part of the practice quiz. Start practicing

  • What is a potential consequence of vent blockage in a gas furnace?
  • What role does duct insulation play in HVAC systems?
  • Is improper location for the vent termination a common problem with sidewall-vented mid-efficiency oil furnaces?
  • Which refrigerant line is larger and commonly contains a liquid?
  • Under proper tension, a belt should deflect about _____ inch(es).
  • During which season does a heat pump primarily act as a heating system?
  • Using a mirror and flashlight to view the heat exchanger on a gas furnace allows the inspector to see _________ heat exchanger.
  • Power venters are never allowed on conventional oil furnaces. True or False?
  • Why are boilers with tankless coil domestic water heaters considered inefficient?
  • Which component differentiates heat pumps from traditional air conditioning systems?
  • Is it standard for high-efficiency boilers to have problems with induced-draft and forced-draft fans?
  • True or False: A home inspection includes using normal operating controls to check the heating system.
  • Is a heat exchanger a component of an HRV?
  • What does a circulator do in a hydronic system?
  • What is the designation of the smaller refrigerant line?
  • The oil burner in a conventional furnace requires oil to be what before it can be ignited?
  • What is the most common fuel source for residential heating systems?
  • Is a thermostat considered an operating control found on hydronic systems?
  • What type of air does an evaporative cooler recirculate across itself?
  • Should an inspector activate the air-conditioning system to test it if it has been shut down?
  • How does flexible ductwork compare to rigid ductwork in terms of friction loss?
  • Do heat pumps require specific refrigerants that differ from those in central air-conditioning systems?
  • What is true regarding refrigerant lines?
  • Are issues with boiler water temperature common in tankless coil water heaters?
  • Where is the compressor typically located in an air-to-air split-system air conditioner?
  • What can indicate that an exhaust vent material is inappropriate for hot gases?
  • True or False: A return grille allows the user to modulate the air flow.
  • What is the average temperature setting for a high-temperature limit switch?
  • What common problem do high-efficiency boilers face regarding their ignitions?
  • What role do inlet and exhaust fans play in an HRV?
  • The smaller appliance vent should connect into the chimney ________ the vent from the larger appliance.
  • Which of the following problems is considered commong for condensers?
  • The minimum required clearance from a single-wall exhaust flue at an oil furnace to combustibles is _____ inches.
  • Is it necessary for heat pumps to have antifreeze in colder climates?
  • True or False: A home inspector should test all automatic safety controls.
  • What is the normal operating pressure for a boiler?
  • Does flexible ductwork experience more or less friction loss compared to rigid ductwork?
  • Which of the following is NOT a component of HRV systems?
  • Which issue is commonly associated with barometric dampers?
  • In HVAC systems, which factor is most important for energy efficiency?
  • Is it possible for a vent damper to fail in the closed position?
  • Which type of heating system is known for being energy efficient and environmentally friendly?
  • What operational aspect can lead to inefficiency in high-efficiency boilers?
  • What is the purpose of the primary controller on a conventional oil furnace?
  • Is a triple-split system found in some heat pumps while absent in central air-conditioning systems?
  • Warm air rising off the pavement on a hot day is an example of heat transfer by __________.
  • What is typically the main concern with rooftop package units regarding the heat exchanger?
  • Do flow-measuring stations exist as components of an HRV?
  • What is the normal setting for a pressure-relief valve?
  • A pump control is an operating control found on a hydronic system. What is the correct answer?
  • What is a typical cause of malfunction in barometric dampers during an inspection?
  • Which of the following components is crucial for the heat-exchange process in air conditioning?
  • What is easier to diagnose when compared to furnaces, according to heating system characteristics?
  • What maintenance issue can arise with high-efficiency boiler fans?
  • What is the typical temperature drop from outdoors to indoors with a properly operating air-conditioning system?
  • The average seasonal efficiency of a condensing furnace is what percentage?
  • What is the purpose of a backflow preventer in a hydronic system?
  • Are pressure-reducing valves necessary for functionality in all boiler systems?
  • The typical cooling load in a moderate climate is how many square feet per ton?
  • What is the purpose of the thermostat in an HVAC system?
  • An unprotected oil-storage tank is a concern in the context of a general home inspection.
  • What is the primary function of the heat exchanger in HVAC systems?
  • What is a disadvantage of oversized ducts in HVAC systems?
  • Is a radiant piping system considered a style of heat delivery used with boilers?
  • What type of draft do forced oil burners rely on?
  • What problem may occur if a black steel pipe connects with copper pipe?
  • What type of contaminants typically accumulate on condensers over time?
  • Is the cabinet considered a structural part of an HRV?
  • What is a common problem found with central air conditioning systems?
  • Is it acceptable to install a gas meter under the drip line of a roof?
  • What type of efficiency does reducing off-cycle losses primarily improve?
  • If high levels of carbon monoxide are detected at the furnace supply registers, what should the inspector do first?
  • The vent in a high-efficiency furnace should slope in what direction?
  • When extending a black steel pipe with copper pipe, what potential issue may arise at the junction?
  • Is the evaporator coil designed to function effectively in a heating climate?
  • What is the method to test the air-conditioning system?
  • An indoor fan is typically found in which type of system?
  • True or False: A balancing valve completely shut off will result in no water flow in the radiator.
  • What is a common characteristic of air filters in HVAC systems?
  • What is one major benefit of using a condensing furnace?
  • Which component is responsible for exhausting products of combustion in a gas furnace?
  • The first type of heating system that didn't require manual stoking was fueled by _________.
  • True or False: An expansion device is a common component of heat pumps and air conditioners.
  • Heat pumps are generally sized based on the __________.
  • Which of the following components is common to both heat pumps and air conditioners?
  • Is a pressure-reducing valve an operating control found on a hydronic system?
  • Is it possible for a boiler to operate without a pressure-reducing valve?
  • What is the typical setting for a low temperature limit or primary control at a boiler?
  • What component helps in distributing hot water in a hot-water heating system?
  • Which of the following is a component of a Heat Recovery Ventilator (HRV)?
  • When there is one large return register located in the center hallway, what is the first course of action?
  • A common problem with barometric dampers is lack of air draft.
  • Should a home inspector test a pressure-relief valve for functionality?
  • True or False: Accumulation of dirt on condensers can lead to reduced efficiency.
  • Do high-efficiency boilers frequently experience problems with heat exchangers?
  • What does HRV stand for in HVAC terminology?
  • Is leaking a common problem associated with condensers?
  • Is a dry evaporator top considered a common issue for evaporators?
  • Should hydronic systems be tested for adequate capacity during an inspection?
  • Which material is rarely used as an exhaust vent for oil combustion gases due to their temperature?
  • What is the minimum outdoor temperature a heat pump should not be operated in cooling mode?
  • What is the typical cooling load in a southern U.S. climate per ton?
  • The indoor coil on a heat pump acts as an evaporator coil in the summer and a __________ coil in the winter.
  • Is it essential to perform regular maintenance on heat pumps to avoid efficiency problems?
  • Which component is a common part of heat pumps and air conditioners?
  • What percentage is the threshold for high-efficiency gas furnaces in terms of AFUE?
  • An underground oil-storage tank falls outside what aspect of inspection?
  • What does the term 'suction line' refer to in HVAC terminology?
  • A heater thermostat located in the kitchen will tend to keep the rest of the house _______ than is desirable.
  • What type of heating system may operate in conjunction with a heat pump for additional backup?
  • Furnaces rated at average efficiency tend to experience what percentage of off-cycle losses of the fuel they consume?
  • Are high-level returns more effective for heating or cooling?
  • Is it necessary for the inspector to report on the presence of a cool-air supply to each room?
  • Is it common for high-efficiency boilers to have problems with the cabinet?
  • The vent connector should slope ______ going away from the furnace at a minimum of _____ per foot.
  • True or False: A convector is a style of heat-delivery system used with boilers.
  • Which situation is a direct result of not having adequate combustion air?
  • True or False: A compressor is a common component of heat pumps and air conditioners.
  • How do copper-tube boilers typically compare to cast-iron boilers in terms of heat-transfer characteristics?
  • The evaporator coil on a split system is typically located in which area?
  • Is it mandatory for every oil furnace to have a barometric damper?
  • Are automatic air vents mandatory on all boilers?
  • What is the primary function of the compressor in a heat pump?
  • What is a common problem related to barometric dampers?
  • True or False: An outdoor coil is a common component of heat pumps and air conditioners.
  • In a heating-only climate, an uninsulated heating duct running through a garage will deliver ______ air to the room at the other end of the duct.
  • Why is the placement of the vent pipe important in high-efficiency furnaces?
  • It is _______ in many jurisdictions for electrical wiring and plumbing pipes to be run inside return ducts.
  • Do evaporators often encounter issues due to not being cleaned regularly?
  • Are combustion air and venting problems typical for high-efficiency boilers?
  • What type of system primarily relies on refrigerant lines?
  • What is the primary function of a thermostat in an HVAC system?
  • A common problem with oil furnace vent connectors is that they can become loose. True or False?
  • The purpose of the HVAC portion of a general home inspection is to ensure that the system _________.
  • What function does a thermostat serve in HVAC systems?
  • When gas is compressed, what happens to its temperature?
  • What is generally not a result of scorching inside a burner access door?
  • True or False: An auxiliary electric heating system is typically installed upstream of the heat pump coil.
  • Are corroded vents a common problem with sidewall-vented mid-efficiency oil furnaces?
  • It's common to find inadequate clearance from oil furnace vent connectors to nearby combustibles. True or False?
  • Does a leaking oil tank fall outside the scope of a general home inspection?
  • Which component is essential for improving air quality in HVAC systems?
  • Are zone valves considered operating controls in hydronic systems?
  • In heat pump systems, the primary role of the condenser coil is to __________.
  • A heat pump may detect a temperature difference between the outdoors and indoors that is __________ what an air conditioner would detect.
  • Which statement is true regarding a compressor in HVAC systems?
  • What does the classification of a thermostat as an operating control imply?
  • What is the typical lifespan of a conventional gas furnace?
  • What happens when a heat exchanger fails in a boiler?
  • What impact does the design of return ducts have on HVAC system performance?
  • Which issue is most likely found at the condenser site of an HVAC system?
  • What is a typical problem with supply registers located in individual rooms without proper return paths?
  • What is likely causing a wavering flame at one burner in a gas furnace when the blower activates?
  • Which component in a heat pump system helps regulate the flow of refrigerant?
  • Is a single-stage compressor a component that is common in both heat pumps and central air-conditioning systems?
  • If a boiler in a Victorian home has a pressure-reducing valve set to 12 psi, is this setting considered too low?
  • What is a common problem found with water-cooled coils?
  • Inadequate air draft is a common problem with barometric dampers.
  • What is an important function of duct insulation in HVAC systems?
  • What HVAC component is often used to control the overall performance of the system?
  • Are safety and operating control issues common in high-efficiency boilers?
  • Is lack of access to the coil a common problem with evaporators?
  • What is the primary purpose of duct systems in HVAC?
  • What should home inspectors check in the air-handling system?
  • Are condensate handler issues commonly found in high-efficiency boilers?
  • Is a crack in the heat exchanger of a rooftop package unit considered a concern?
  • Is an outdoor air thermostat classified as an operating control in hydronic systems?
  • What should be done if high levels of carbon monoxide are detected in a home?
  • True or False: An indoor coil is a common component of heat pumps and air conditioners.
  • In most HVAC systems, where is the evaporator coil typically located?
  • Are heat pumps distinctively regulated by a specific code from central air-conditioning systems?
  • Inspectors should check for poor slope at oil furnace vent connectors. True or False?
  • True or False: Forced-air HVAC systems use fans and ducts to move air around the house.
  • Do mono-port burners typically have a larger output than ribbon burners?
  • Is a pump considered a component in a hot-water distribution system?
  • Is frost buildup a frequent issue with evaporator coils?
  • Which safety control prevents water in a boiler system from becoming super-heated?
  • What is the primary function of the oil vent pipe?
  • What is the main concern regarding condensation in high-efficiency furnaces?
  • Which issue can cause sidewall-vented mid-efficiency oil furnaces to function poorly?
  • Oil furnace vent connectors are often poorly supported. True or False?
  • Is an outdoor air-temperature sensor a component of heat pumps that differs from central air-conditioning systems?
  • Is a duct system considered a component of an HRV?
  • Which component is essential for distributing conditioned air in HVAC systems?
  • What is a common indication of a malfunctioning air-conditioning system?
  • What is the consequence of a malfunctioning high-temperature limit switch?
  • What is a significant issue affecting the efficiency of tankless coil systems?
  • Do radiant piping systems require bleed valves?
  • What is the primary purpose of an HVAC air filter?
  • What is the typical location of the condenser fan in a split-system air-conditioning unit?
  • Can condensate leakage from the induced-draft fan housing cause corrosion of the primary heat exchanger?
  • Which of the following does NOT describe a characteristic of radiant heating systems?
  • Which component is critical for filtering air in HVAC systems?
  • What is the maximum desirable temperature for an 8-foot ceiling in a room with radiant pipe heating?
  • Corrosion is a common problem found in which component of HVAC systems?
  • A common problem with barometric dampers is misadjusted air draft.
  • Are oversized HVAC ducts commonly considered a problem?
  • When considering whether an automatic air vent is needed, what code should be followed?
  • True or False: A gas furnace back-up system typically has the heat exchanger located upstream of the heat pump coil.
  • In a hydronic system, mixing two types of heat delivery devices can lead to what outcome?
  • Does reducing off-cycle losses improve steady-state efficiency?
  • Is an indoor compressor a component unique to heat pumps compared to central air-conditioning systems?
  • What action should be taken if corroded vents are found during an inspection?
  • Most residential heating systems are of _______ output.
  • Vent connectors should be less than ____ feet long.
  • What type of wall is recommended for radiator installation?
  • What type of water is commonly used to cool a coil that is part of an HVAC system?
  • Which is preferred: an undersized air conditioner or an oversized one?
  • Leakage is frequently seen in which type of HVAC coil?
  • Is it common to find insulation on both refrigerant lines of heat pumps and air conditioners?
  • What could happen if a pressure-relief valve setting is too high?
  • Should the evaporator coil be positioned upstream of the furnace’s heat exchanger?
  • Do sidewall-vented mid-efficiency oil furnaces often suffer from poor reliability?
  • What component of a forced-air system is used to distribute heated air throughout a home?
  • What might indicate a faulty installation in a gas furnace?
  • Are distribution problems common with high-efficiency boilers?
  • The post-purge cycle on an induced-draft fan ensures that what is exhausted?
  • Which of the following is a common problem with condensers?
  • Is rusting a common problem found on vent connectors of oil-fired furnaces?
  • If a radiator's balancing valve is completely shut off, will there be water in the radiator?
  • Mixing convectors and radiators in a hydronic system often affects heating regulation. True or False?
  • Before ignition, oil must be what?
  • Is it true that a corroded oil-storage tank is usually not worth reporting?
  • Does a heating climate require less air to cross an evaporator coil compared to a conventional furnace's heat exchanger?
  • Is corrosion a common issue encountered on evaporators in HVAC systems?
  • Under sizing is a common problem found with oil furnace vent connectors. True or False?
  • Must the vent connector from an oil-fired furnace connect to the chimney above the vent connector from the water heater?
  • What is the typical pressure of a residential oil-burner pump?
  • What type of HVAC system is most commonly found in residential settings?
  • Does a two-stage thermostat differentiate heat pumps from central air-conditioning systems?
  • What is a common operational issue faced by barometric dampers?
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy