- What the Letters in AZ-ACR Actually Mean
- Who Governs and Administers This Exam
- Exam Format: Questions, Time, and Passing Score
- The 12 Domains Behind the Acronym
- Fees, Registration, and the Separate SRE
- What You're Allowed to Bring Into the Testing Room
- Who Actually Needs This Credential
- Turning the Acronym Into a Study Plan
- Retakes, Results, and License Application Timing
- Frequently Asked Questions
- AZ-ACR refers to the Arizona R-39R/C-39 (CR-39) Air Conditioning and Refrigeration trade exam under the Arizona ROC.
- The trade exam has 80 scored questions, a 210-minute limit, and a 70% passing requirement.
- Refrigeration, Air Conditioning, and Warm Air Heating each carry 12 questions - the heaviest domains on the outline.
- The trade exam costs $66 per attempt; the separate Statutes and Rules Exam (SRE) costs $61.
What the Letters in AZ-ACR Actually Mean
On this site, "AZ-ACR" is shorthand for the Arizona R-39R/C-39 (CR-39) Air Conditioning and Refrigeration (Residential/Commercial) Examination. That's a mouthful, so contractors and study resources compress it into a single acronym - but the underlying exam is very specific: it's the non-solar trade examination that PSI Services LLC administers on behalf of the Arizona Registrar of Contractors (ROC) for the R-39R and C-39 classification lines, often referenced collectively by test-takers as CR-39.
It's worth pausing on this because "AZ-ACR" is a generic-sounding acronym, and other credentials elsewhere use similar phrasing. If you land on a page discussing "AZ-ACR" that mentions a different governing body, different fees, or unfamiliar domain names, you're likely reading about a different program entirely. For clarity going forward, every fact in this article - and across AZ-ACR Certification and What Is AZ-ACR? - refers specifically to the Arizona R-39R/C-39 (CR-39) trade exam.
Who Governs and Administers This Exam
Two organizations sit behind the AZ-ACR name. The Arizona Registrar of Contractors is the licensing authority - it sets the classification requirements, determines who must sit for the exam, and ultimately issues the contractor license. PSI Services LLC is the testing vendor that builds, delivers, and scores the actual exam content, including the trade outline for R-39R/C-39 and the general candidate bulletin that governs testing-day rules.
These are separate documents with separate purposes. The trade outline (last revised June 8, 2023) tells you what's tested and in what proportion. The general PSI candidate bulletin (dated February 18, 2026) tells you how testing day works - identification rules, calculator policy, and remote-proctoring restrictions. Anyone building a prep plan should read both, not just one or the other.
Exam Format: Questions, Time, and Passing Score
The R-39R/C-39 trade exam is delivered as computer-based multiple choice, and candidates can choose between a physical test center or a remote-proctored session. The core numbers to memorize before you ever open a textbook:
- 80 questions on the scored outline
- 210 minutes to complete the exam
- 70% passing requirement
- PSI may insert 5-10 unscored experimental questions within that same time window, so the exam you sit may feel slightly longer than 80 questions without any warning about which items don't count
Because experimental items are indistinguishable from scored ones, the practical approach is to treat every question as if it counts and manage your 210 minutes accordingly. For a deeper breakdown of how difficult this pacing actually is in practice, see How Hard Is the AZ-ACR Exam? Complete Difficulty Guide 2026, and for the exact scoring math behind that 70% threshold, review AZ-ACR Passing Score 2026: Exactly What You Need to Pass.
Key Takeaway
Budget roughly 2.5 minutes per question across the 210-minute window, but leave room for a handful of items that will feel unusually specific or oddly placed - those may be unscored experimental questions, and losing time second-guessing them isn't productive.
The 12 Domains Behind the Acronym
The "AC" and "R" in AZ-ACR point to air conditioning and refrigeration, but the actual outline spans twelve distinct domains covering the full scope of residential and commercial HVAC/R work in Arizona. Question allocations are fixed by PSI's official outline:
| Domain | Questions |
|---|---|
| 1. Refrigeration | 12 |
| 2. Air Conditioning | 12 |
| 3. Warm Air Heating | 12 |
| 4. Controls and Motors | 8 |
| 5. Boilers | 4 |
| 6. Ventilation | 4 |
| 7. Evaporative Coolers | 4 |
| 8. Fuel Piping Systems | 5 |
| 9. Water Piping Systems | 5 |
| 10. Steam, Hot, Chilled, and Condensing Water | 5 |
| 11. Testing, Balancing, and Inspections | 5 |
| 12. Sizing and Estimating | 4 |
Refrigeration, Air Conditioning, and Warm Air Heating are tied as the joint-largest subject areas at 12 questions apiece - together they make up nearly half the exam. That's a strong signal for how to weight your study time, and it's exactly what the acronym implies at face value, even though the full outline is much broader than just "AC and refrigeration."
Refrigeration, Air Conditioning, Warm Air Heating
These three domains anchor the exam and deserve equal, sustained attention rather than a single review pass.
- Refrigerant cycle behavior, component function, and troubleshooting logic
- Cooling system sizing, airflow, and equipment selection scenarios
- Warm air furnace operation, combustion basics, and heat exchanger safety
The remaining nine domains are smaller individually but still collectively represent more than half the exam. A full walkthrough of what each domain actually tests - including how Controls and Motors, Boilers, and the piping-related domains overlap in real trade scenarios - is covered in AZ-ACR Exam Domains 2026: Complete Guide to All 12 Content Areas.
Fees, Registration, and the Separate SRE
Understanding the acronym also means understanding what you're actually paying for. The R-39R/C-39 trade exam carries a $66 fee per attempt. Separately, Arizona requires most contractor applicants to also pass the Statutes and Rules Exam (SRE), an online exam priced at $61, which tests Arizona contracting law rather than HVAC/R technical content.
These two exams are administered differently - the SRE is taken online, while the trade exam offers both test-center and remote-proctored delivery - and they're scored independently. Treating them as one combined event is a common early mistake. A full cost breakdown, including how license fees and bonding obligations sit outside the exam fees entirely, is available in AZ-ACR Certification Cost 2026: Complete Pricing Breakdown.
What You're Allowed to Bring Into the Testing Room
The R-39R/C-39 exam is partially open-book, which is another detail that distinguishes it from many trade exams. Approved references include:
- OSHA 29 CFR Part 1926, or PSI's selected equivalent, with the latest available amendments
- The 2018 International Fuel Gas Code
- The 2018 International Mechanical Code
Other textbooks named in the outline are study-only references - they help you learn the material, but you cannot bring them into the exam session. Candidates may highlight, underline, annotate, and add permanent tabs to their approved references in advance, but loose additional papers are prohibited, and writing in the references during the actual test session is not allowed. The general bulletin also permits a silent, nonprinting, nonprogrammable, nonscientific calculator. Remote-proctored sessions add further restrictions: no scratch paper and no breaks during the exam window.
Knowing how to navigate an open-book code reference under time pressure is its own skill. Practicing tab placement and quick-lookup strategy before test day - rather than during it - is one of the most overlooked parts of preparing, and it's addressed in detail in AZ-ACR Study Guide 2026: How to Pass on Your First Attempt.
Who Actually Needs This Credential
The R-39R/C-39 exam exists because Arizona requires the qualifying party on an HVAC/R contracting license to demonstrate trade competency directly. Ordinarily, that qualifying party needs four years of practical or management trade experience, including two years within the preceding ten. Qualifying technical training can substitute for up to two of those four years.
This exam matters most to:
- Individuals seeking to become the qualifying party on an R-39R or C-39 Arizona contractor license
- HVAC/R technicians moving from field work into a licensed, business-owning role
- Companies expanding into residential or commercial air conditioning and refrigeration work in Arizona
Detailed eligibility rules - including how technical training substitutes for experience and what documentation the ROC expects - are broken down in AZ-ACR Requirements 2026: Eligibility, Prerequisites & How to Qualify. For a look at how this credential translates into career paths and hiring demand, see AZ-ACR Jobs.
Turning the Acronym Into a Study Plan
Once you understand that AZ-ACR really means twelve weighted domains rather than just "air conditioning and refrigeration," scheduling becomes more logical. Spend the most calendar time on the three 12-question domains, then work through the smaller domains in clusters based on how they relate on the job - piping systems together, controls and sizing together.
Refrigeration, Air Conditioning, Warm Air Heating
- Work through refrigerant cycle diagrams and component troubleshooting scenarios
- Review cooling load and airflow fundamentals
- Study furnace combustion, venting, and heat exchanger safety rules
Controls and Motors, Fuel/Water Piping
- Review motor types, control circuits, and common wiring configurations
- Study fuel gas piping sizing using the 2018 International Fuel Gas Code
- Review water piping layout and material rules
Boilers, Ventilation, Evaporative Coolers, Steam/Hot/Chilled Water, Sizing, Testing/Balancing
- Cover the remaining smaller domains in short focused sessions
- Run full-length timed practice sets under the 210-minute limit
- Practice open-book lookups in the 2018 International Mechanical Code
If you're weighing whether to build a full multi-week plan or a shorter sprint, How Hard Is the AZ-ACR Exam? Complete Difficulty Guide 2026 walks through how the domain weighting and open-book format affect overall difficulty, and AZ-ACR Cheat Sheet 2026: One-Page Review of Must-Know Facts is useful for a final-week review pass.
Retakes, Results, and License Application Timing
If you don't pass on the first attempt, Arizona's retake rules apply cleanly but firmly: a 30-day wait is required before retesting, and if you reach a fourth or later attempt, the wait extends to 90 days. Each attempt requires paying the $66 fee again.
There's also a timing rule that catches some applicants off guard: exam results must fall within the two years preceding the license application. Passing early and waiting too long to apply can mean your results expire before the ROC processes your license. Contractor licenses themselves renew on a biennial basis once issued, with license fees and bonding handled separately from exam costs.
For anyone still deciding whether to pursue this path at all, weighing time investment against career outcome is worthwhile reading - see Is the AZ-ACR Certification Worth It? Complete ROI Analysis 2026 and AZ-ACR Salary Guide 2026: Complete Earnings Analysis for related context. And once you're ready to test your knowledge against realistic questions, the practice platform at the main AZ-ACR practice test site is built around this exact 12-domain outline.
Frequently Asked Questions
On this site, yes - it always refers to the Arizona R-39R/C-39 (CR-39) Air Conditioning and Refrigeration trade exam administered by PSI for the Arizona ROC. Other sites may use the same letters for unrelated credentials, so always confirm the governing body before trusting fee or format details.
No. The Statutes and Rules Exam is a separate online exam with its own $61 fee. AZ-ACR as used here refers specifically to the 80-question trade exam, though both exams are typically required for licensure.
Refrigeration, Air Conditioning, and Warm Air Heating each carry 12 questions and are the joint-largest domains, so they deserve the earliest and heaviest study attention.
Only the approved references - OSHA 29 CFR Part 1926, the 2018 International Fuel Gas Code, and the 2018 International Mechanical Code - may be used open-book. Other textbooks in the outline are for study purposes only and aren't permitted during testing.
There's no stated cap on attempts, but wait times increase: 30 days between most attempts, extending to 90 days once you reach a fourth or later attempt, with the $66 fee paid each time.
Understanding exactly what AZ-ACR stands for - the Arizona R-39R/C-39 (CR-39) trade exam, its twelve domains, and its specific fee and timing structure - is the foundation for building an accurate study plan rather than one borrowed from an unrelated credential. From here, the AZ-ACR Meaning and What Does AZ-ACR Mean? articles go deeper into context, while practicing with domain-aligned questions is the most direct way to confirm you're ready for exam day.