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100+ Free HVAC Excellence AC Practice Questions

Pass your HVAC Excellence Professional Technician — Residential Air Conditioning exam on the first try — instant access, no signup required.

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2026 Statistics

Key Facts: HVAC Excellence AC Exam

100

Practice Questions

OpenExamPrep

100

Exam Questions

HVAC Excellence

70%

Passing Score

HVAC Excellence

Closed-book

Exam Format

HVAC Excellence

Core

Required Prerequisite

HVAC Excellence

2 years

Field Experience

HVAC Excellence

The HVAC Excellence Professional Technician — Residential Air Conditioning certification, issued by HVAC Excellence (a division of the ESCO Group), validates an experienced technician's mastery of residential AC. It is a closed-book, proctored written exam of 100 multiple-choice questions requiring 70% to pass. Eligibility requires two years of verified field experience and passing the Professional Core exam (Principles of Electrical and Refrigeration Theory) first. Content spans air conditioning and refrigeration theory, refrigerant flow controls and metering, components, system service and charging, installation, electrical troubleshooting, and diagnostics. It is distinct from NATE, the other major HVAC certifying body. This free prep includes 100 research-based practice questions with explanations and an AI tutor.

Sample HVAC Excellence AC Practice Questions

Try these sample questions to test your HVAC Excellence AC exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1In the basic refrigeration cycle, which component absorbs heat from the conditioned space?
A.Condenser
B.Evaporator
C.Compressor
D.Metering device
Explanation: The evaporator is the low-side heat exchanger where low-pressure liquid refrigerant boils into vapor, absorbing heat from the indoor air and producing the cooling effect. The condenser rejects that heat outdoors.
2What change of state occurs in the refrigerant as it passes through the evaporator of an operating air conditioner?
A.Vapor to liquid
B.Liquid to vapor
C.Vapor to vapor only
D.Liquid to liquid only
Explanation: In the evaporator, low-pressure liquid refrigerant boils and changes from liquid to a vapor as it absorbs latent heat from the air. This phase change is where the bulk of the cooling capacity comes from.
3The heat that causes a substance to change state without a change in temperature is called:
A.Sensible heat
B.Latent heat
C.Specific heat
D.Superheat
Explanation: Latent heat is the energy absorbed or released during a phase change (boiling or condensing) while temperature stays constant. The refrigeration cycle relies on latent heat in the evaporator and condenser.
4Superheat is defined as the temperature of a refrigerant vapor:
A.Below its saturation temperature
B.At its saturation temperature
C.Above its saturation temperature at a given pressure
D.Of the liquid leaving the condenser
Explanation: Superheat is the number of degrees a vapor is heated above its saturation (boiling) temperature for the measured pressure. At the evaporator outlet it confirms all liquid has boiled off, protecting the compressor from liquid floodback.
5Subcooling is measured on which part of the refrigeration system?
A.Suction line at the evaporator outlet
B.Liquid line leaving the condenser
C.Discharge line at the compressor
D.Vapor line entering the compressor
Explanation: Subcooling is the degrees the liquid refrigerant is cooled below its saturation temperature, measured on the liquid line leaving the condenser. It confirms a solid column of liquid is feeding the metering device.
6To find the saturation temperature that corresponds to a measured refrigerant pressure, a technician uses a:
A.Psychrometric chart
B.Pressure-temperature (PT) chart
C.Mollier diagram only
D.Sling hygrometer
Explanation: A pressure-temperature (PT) chart lists the saturation temperature for each refrigerant at a given pressure. Technicians use it to convert gauge pressures into saturation temperatures when calculating superheat and subcooling.
7R-410A is best described as a refrigerant that operates at pressures approximately:
A.The same as R-22
B.About 50-70% higher than R-22
C.About half that of R-22
D.Below atmospheric pressure
Explanation: R-410A operates at roughly 50-70% higher pressures than R-22, so it requires equipment, gauges, and recovery components rated for the higher pressures. It is a near-azeotropic blend that can be charged as a liquid.
8When charging R-410A into a system from the cylinder, it should be added as a:
A.Vapor only, from the top of the cylinder
B.Liquid, often through a metering device into the low side
C.Liquid into the discharge line
D.Either vapor or liquid with no difference
Explanation: Because R-410A is a blend, it is charged as a liquid to keep the blend fractions correct. Liquid is metered (throttled) into the low side or added to the high side during an off cycle to avoid slugging the compressor.
9A thermostatic expansion valve (TXV) primarily controls:
A.Condenser subcooling
B.Evaporator superheat
C.Compressor discharge temperature
D.Head pressure
Explanation: A TXV meters refrigerant to maintain a relatively constant superheat at the evaporator outlet over a range of loads. By holding superheat, it keeps the evaporator fully active while protecting the compressor from floodback.
10The three forces acting on a TXV diaphragm are bulb pressure, evaporator pressure, and:
A.Discharge pressure
B.Spring pressure
C.Atmospheric pressure
D.Liquid-line pressure
Explanation: A TXV balances three forces: sensing-bulb pressure tends to open the valve, while evaporator (suction) pressure and the adjustable superheat spring tend to close it. The valve settles where these forces balance, setting operating superheat.

About the HVAC Excellence AC Exam

The HVAC Excellence Professional Technician — Residential Air Conditioning certification is a discipline-specific, closed-book written exam for experienced technicians. It has 100 multiple-choice questions and requires 70% to pass. Candidates must first pass the Professional Core exam (Principles of Electrical and Refrigeration Theory) and have two years of verified field experience.

Assessment

100 multiple-choice questions delivered as a closed-book, proctored written exam, requiring 70% to pass; this practice bank mirrors that 100-question format

Time Limit

Approximately 2 hours (proctored)

Passing Score

70%

Exam Fee

Approximately $60-$100 per Professional Level exam (set by proctor; varies) (HVAC Excellence (a division of the ESCO Group / ESCO Institute))

HVAC Excellence AC Exam Content Outline

18%

Air Conditioning & Refrigeration Theory

The refrigeration cycle, latent and sensible heat, superheat and subcooling, saturation and PT charts, ton of refrigeration, psychrometrics, and compression ratio

12%

Refrigerant Flow Controls & Metering

TXV force balance and sensing bulb, internal vs external equalizers, fixed orifice and capillary tube, automatic and electronic expansion valves

12%

Components

Compressors, condensers, evaporators, receivers, accumulators, filter driers, crankcase heaters, and ECM blowers

20%

System Service & Charging

Evacuation to 500 microns, weighing in charge, superheat and subcooling charging, EPA 608 recovery, POE oil handling, and acid cleanup

10%

Installation

Brazing with nitrogen purge, leak and pressure testing, line-set sizing and charge adjustment, oil return, condensate drainage, and airflow

18%

Electrical Troubleshooting

Capacitors and hard-start kits, compressor terminals and windings, contactors and transformers, pressure switches, Ohm's law, and motor current

10%

Diagnostics

Superheat and subcooling patterns for undercharge, overcharge and restriction, frozen coils, non-condensables, static pressure, and leak detection

How to Pass the HVAC Excellence AC Exam

What You Need to Know

  • Passing score: 70%
  • Assessment: 100 multiple-choice questions delivered as a closed-book, proctored written exam, requiring 70% to pass; this practice bank mirrors that 100-question format
  • Time limit: Approximately 2 hours (proctored)
  • Exam fee: Approximately $60-$100 per Professional Level exam (set by proctor; varies)

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

HVAC Excellence AC Study Tips from Top Performers

1Master superheat and subcooling first — know which metering device is charged by which method (fixed orifice = superheat, TXV = subcooling)
2Memorize the TXV three-force balance: bulb pressure opens; spring plus evaporator pressure close
3Learn the diagnostic patterns cold: undercharge = high superheat/low subcooling; overcharge = low superheat/high subcooling; restriction = high superheat/high subcooling
4Be fluent with compressor terminal identification (Common, Start, Run) and capacitor testing in microfarads
5Review EPA 608 recovery rules, deep evacuation to 500 microns, and POE oil moisture handling for R-410A
6Complete all 100 practice questions and review every miss with the AI tutor before sitting the exam

Frequently Asked Questions

How many questions are on the HVAC Excellence Professional AC exam and how long is it?

The HVAC Excellence Professional Technician — Residential Air Conditioning exam is a closed-book written test of 100 multiple-choice questions, typically allotted about two hours. You need 70% to pass.

What score do I need to pass the HVAC Excellence Professional AC exam?

You need 70% to pass. Because it is a comprehensive exam covering theory, metering, components, service and charging, installation, and electrical troubleshooting, balanced study across every area is important.

What are the prerequisites for the HVAC Excellence Professional AC certification?

You must first pass the HVAC Excellence Professional Core exam (Principles of Electrical and Refrigeration Theory) and have two years of verified HVACR field experience before sitting any Professional Level specialty exam.

Is the HVAC Excellence Professional AC exam open- or closed-book?

It is a closed-book, proctored written exam. Professional Level certifications are designed to confirm an experienced technician's working knowledge without reference materials.

How is HVAC Excellence different from NATE?

HVAC Excellence (part of the ESCO Group) and NATE are both major HVACR certifying bodies, but they are separate organizations with their own exams. This practice bank targets the HVAC Excellence Professional Technician AC exam specifically.

Is this free HVAC Excellence AC practice as good as paid prep?

Our 100 practice questions cover the same residential AC content areas as the exam, with a teaching explanation for every answer plus free daily AI tutor interactions. All content is free forever and updated for 2026.