HVAC License Practice Tests by State

Free HVAC Heat Pump Practice Test 2. 25 questions covering heat pump installation costs, air handler CFM calculations, low-voltage compressor effects, heating and cooling mode heat flow, indoor coil evaporator function, outdoor heat sink, frost efficiency reduction, defrost cycle timing, auxiliary heat in defrost, defrost thermostat location, dual fuel hybrid systems, outdoor unit clearances, condensate drain requirements, refrigerant overcharge and undercharge symptoms, HSPF heating efficiency rating, ECM blower motor advantages, MERV filter ratings, thermostat wiring terminals, lock-out tag-out safety procedures, capacitor functions, and heat pump noise troubleshooting.

Free HVAC Heat Pump Practice Test 3. 25 questions on defrost thermostat operation at 32°F, outdoor air as heat source, minimum SEER requirements, HSPF ratings, hermetic compressors, refrigerant state between evaporator and compressor, reversing valve function, blower operation troubleshooting, 500-micron evacuation standard, poly-phase motor starters, vapor compression cycle, heat pump sizing, desuperheater operation, refrigerant migration prevention, and two-stage compressor advantages.

Free HVAC Heat Pump Practice Test 4. 25 questions covering refrigerant circulation direction, indoor coil as heat transfer surface, O-terminal cooling control, low-pressure gas between evaporator and compressor, heat pump high efficiency advantages, underground heat pump class requirements, voltmeter and thermostat troubleshooting, low-charge reversing valve diagnosis, incorrect thermostat wiring effects, reversing valve operational modes, refrigerant oil types, heat pump electrical safety, defrost board operation, auxiliary heat lockout settings, and refrigerant phase changes.

Free HVAC Heat Pump Practice Test 5. 25 questions on COP calculations, defrost thermostat positioning, auxiliary heat in defrost cycle, frost effect on efficiency, outdoor coil as condenser in cooling, heat direction in cooling mode, halogen leak detector sensitivity, voltage and current measurement, heat pump charging in cooling mode, unit capacity in 3+ ton heat pumps, zoning systems, mini-split ductless heat pumps, heat pump water heaters, geothermal basics, and heat pump installation codes.

Free HVAC Air Conditioning Practice Test 1. 25 questions on humidification, dew point, latent heat, return air ductwork, atmospheric pressure, altitude effects on pressure, absolute pressure, vaporization pressure, psychrometric readings, ASHRAE ventilation standards, sensible heat ratio, cooling coil selection, air-side economizer operation, cooling tower basics, and refrigerant circuit component identification.

Free HVAC Air Conditioning Practice Test 2. 25 questions covering latent heat and state changes, relative humidity ranges, Boyle's Law, refrigerant vapor compression, occupant ventilation requirements, air cleaning principles, ASHRAE comfort temperature index, human heat production, gas compression basics, minimum SEER standards, evaporative cooler operation, refrigerant compressor types, condenser water treatment, economizer controls, and cooling load calculation basics.

Free HVAC Air Conditioning Practice Test 3. 25 questions on evaporative cooling effects, cold water temperature ranges for cooling, compressor-generated pressure differences, head pressure relationship to horsepower, duct velocity and friction loss, BHP and RPM relationships, tons of refrigeration (1 ton = 12,000 BTU/hr), sensible heat and latent heat removal, sensible heat definition, Boyle's Law pressure-volume relationships, refrigerant contaminants, compressor lubrication, expansion valve operation, condenser sizing, and cooling coil dehumidification.

Free HVAC Air Conditioning Practice Test 4. 25 questions covering heat flow from hot to cold, sensible heat measurement with thermometers, dew point temperature, human heat production rates, most common gas compression methods, condenser water temperature differential, BHP and AHP relationship, low velocity and friction losses, series fan configurations, sensible heat removal effects, air distribution strategies, HVAC maintenance intervals, dehumidifier selection, refrigerant cylinder safety, and hydronic heating basics.

Free HVAC Controls Practice Test 1. 25 questions on pneumatic control systems, normally closed vs normally open control devices, controller-controlled device relationships, 4-20 mA current loops, primary control variables, thermocouple high-temperature applications, thermistor sensitivity, RTD positive temperature coefficient, wire length resistance effects, pitot tube air velocity measurement, PID control theory, DDC system advantages, control loop terminology, proportional band, and actuator types.

Free HVAC Controls & Sensors Practice Test 2. 25 questions covering thermistors, magnetic flow meters, Bourdon tube pressure sensors, ASHRAE humidity limits, thermopiles, self-powered VAV diffusers, capacitive humidity sensors, CO2 NDIR sensors, differential pressure transmitters, RTD wiring configurations, PIR occupancy sensors, velocity/static/total pressure relationships, duct pressure sensor placement, sensor calibration, and CO safety detection.

Free HVAC Controls & Sensors Practice Test 3. 25 questions on air pressure principles, on/off vs modulating control, HVAC control system benefits, controller-sensor relationships, analog vs digital sensors, non-contact sensing, voltage sensors, RTD types, sensor-transducer-transmitter assemblies, open-loop vs closed-loop control, BAS hierarchy levels, pneumatic thermostat operation, VAV box control sequences, dual-duct systems, and control valve authority.

Free HVAC Controls & Sensors Practice Test 4. 25 questions covering capillary temperature sensors, resistance-to-cross-sectional area relationships, thermocouple self-powered operation, ultrasonic transit-time flow measurement, electronic vs non-electronic sensors, dew point temperature, thermocouple millivolt output, bi-metallic temperature sensing, psychrometrics, PT100 RTD fundamentals, thermocouple types J and K, sensor dead band, diaphragm pressure sensors, vortex flow meters, and CO2 sensor demand-controlled ventilation.

Free HVAC Controls and Sensors Practice Test 5. 25 questions on RTD linear characteristics, capacitance fluid level sensing, RTD resistance behavior, chilled mirror hygrometers, dew point measurement, quartz crystal humidity sensors, magnetic flow meters, thermocouple selection, control valve flow characteristics, freeze stats, high-limit controls, AHU sequences, optimum start, zoning strategies, and chilled water pump differential pressure control.

Free HVAC Basic Electrical Practice Test 1. 25 questions on fundamental electrical concepts including conductance (mho), battery DC output, ammeter current measurement, Ohm's Law, fuse sizing, resistance as current opposition, ohmmeter operation, capacitor parallel circuits, voltmeter readings, parallel circuit current, power factor, single-phase vs three-phase systems, HVAC run capacitors, GFCI protection, transformer turns ratios, kilowatt-horsepower conversion, voltage drop, NEC grounding, control circuits, and 24V HVAC controls.

Free HVAC Basic Electrical Practice Test 2. 25 questions on transformer primary and secondary sides, inductance (henry), parallel resistor equivalent values, electromagnet strength, current path resistance, magnetic reluctance, DC meter AC conversion, series/shunt ohmmeter types, megger insulation testing, halogen leak detector sensitivity, Ohm's Law applications, wattmeter connection, clamp-on ammeter operation, Kirchhoff's Laws, AC reactance, power factor correction capacitors, motor overload relay function, three-phase power calculations, transformer VA rating, and ground fault protection.

Test your knowledge of HVAC electrical fundamentals with this 25-question practice exam. Topics include motor starting current, capacitor selection, three-phase motor protection, NEC 440 requirements, motor winding testing, and compressor electrical diagnostics.

Advance your HVAC electrical knowledge with this 25-question practice exam. Topics include transformer core construction, contactors vs relays, VFD motor control, reversing valve wiring, 24V control circuits, HACR breakers, NEC 110.3(B) compliance, capacitor testing, and clamp-on ammeter technique.

This test covers Ohm's Law and basic circuit math for HVAC technicians. You will practice calculating voltage, current, and resistance, and see how series and parallel circuits behave differently when a component fails.

This test focuses on HVAC motor types, including PSC, CSIR, CSCR, ECM, and shaded-pole motors. You will also practice diagnosing run and start capacitor failures using symptoms and microfarad tolerance math.

This test covers HVAC control transformers and 24V control circuits. You will practice VA sizing calculations, primary and secondary winding roles, and troubleshooting a control circuit that has lost power.

This test covers reading ladder diagrams and understanding normally open (NO) and normally closed (NC) contact logic. You will trace cooling calls, safety switch interlocks, and defrost rungs step by step.

This test covers three-phase power for HVAC equipment, including delta and wye configurations and phase rotation safety. You will practice identifying the dangers of reversed rotation on scroll compressors.

This test covers the electrical components of a refrigerant circuit: compressor contactors, start relays, low and high-pressure switches, defrost cycles, and crankcase heaters. You will practice tracing safety interlocks and diagnosing common failures.

This test covers electrical safety for HVAC technicians: equipment grounding, GFCI protection, the lockout/tagout sequence, and safe capacitor discharge. These practices protect you from shock and arc-flash hazards on every job.

This test covers NEC Article 440, the code section for air conditioning and refrigeration equipment. You will practice MCA and MOCP sizing calculations and the disconnect location rules that apply specifically to HVAC equipment.

This test covers thermostat wire colors and terminal functions (R, C, Y, G, W, O/B), variable frequency drives (VFDs) and inverter-driven equipment, and how troubleshooting an inverter board differs from troubleshooting a simple relay-based control circuit.

A mixed-review test combining Ohm's Law, motor and capacitor diagnosis, ladder diagram logic, three-phase safety, refrigerant-circuit electrical components, and grounding/lockout-tagout safety into realistic troubleshooting scenarios.

This test covers superheat and subcooling fundamentals — what they measure, normal ranges, and how to calculate them from pressure and temperature readings.

This test covers the difference between TXV and fixed-orifice metering devices, and how superheat and subcooling readings guide diagnosis of overcharge, undercharge, and restriction problems.

This test covers clamp-on ammeter technique, common measurement mistakes, and how to correctly read current on HVAC electrical circuits.

This test covers megohmmeter (megger) insulation testing versus basic continuity checks, and how to diagnose grounded motor windings that a standard multimeter can miss.

This test covers reading and interpreting motor nameplate data — locked rotor amps (LRA), rated load amps (RLA), and service factor (SF) — and how each is used in real diagnostics.

This test takes a deeper look at how single-phase motors start — the start winding, run winding, capacitor phase shift, and the centrifugal switch that disconnects the start circuit.

This test covers furnace and air-handler safety switches — the sail (airflow proving) switch and the high-temperature limit switch — and how they fit into the control circuit as safety interlocks.

This test covers time-delay relays and anti-short-cycle protection — why compressors need a delay before restarting, and how this protection is built into control circuits.

This test introduces commercial rooftop equipment concepts — economizers/outdoor air dampers and fan relays/fan centers — at a general, conceptual level.

A mixed diagnostic review combining superheat/subcooling readings with electrical fault scenarios — meters, motor nameplate data, safety switches, and anti-short-cycle protection.