- What Does AZ-ACR Actually Mean?
- Who Issues the AZ-ACR and Who Administers the Test
- Exam Format: Questions, Time, and Passing Score
- The 12 Domains Behind the AZ-ACR Acronym
- Fees, Registration, and Retake Rules
- What You Can (and Can't) Bring Into the Exam
- Who Actually Needs the AZ-ACR
- How to Approach Prep Without Wasting Time
- FAQ
- AZ-ACR here means the Arizona R-39R/C-39 (CR-39) Air Conditioning and Refrigeration trade exam.
- The trade exam has 80 questions, a 70% passing requirement, and a 210-minute time limit.
- Refrigeration, Air Conditioning, and Warm Air Heating each carry 12 questions - the heaviest domains.
- The trade exam costs $66 per attempt; the separate SRE exam costs $61.
What Does AZ-ACR Actually Mean?
On this site, AZ-ACR refers specifically to the Arizona R-39R/C-39 (CR-39) Air Conditioning and Refrigeration (Residential/Commercial) Examination - the trade competency exam that a qualifying party must pass to hold a C-39 or R-39R contractor's license classification in Arizona. It is not a generic industry certification and it is not the same thing as any similarly-abbreviated credential offered elsewhere. If you searched "AZ-ACR" and landed here expecting something different, this article is the one place to get the facts straight before you spend money on the wrong study material.
The exam is built around a specific trade outline used by PSI Services LLC, the testing vendor contracted to deliver Arizona contractor licensing exams. The outline covers residential and commercial air conditioning, refrigeration, and related mechanical systems - not electrical, plumbing, or general contracting content. If you're preparing, our AZ-ACR Exam Domains 2026: Complete Guide to All 12 Content Areas breaks down every content area in the outline in detail.
Who Issues the AZ-ACR and Who Administers the Test
The Arizona Registrar of Contractors (ROC) is the licensing authority that requires this exam as part of qualifying for a C-39 or R-39R contractor license. The ROC does not write or proctor the exam itself - that job belongs to PSI Services LLC, which publishes the official trade outline and the candidate information bulletin, schedules test sessions, and scores results.
This distinction matters because it explains the two-document structure candidates need to understand: the trade outline (last revised June 8, 2023) defines the content and question allocation, while the general PSI candidate bulletin (dated February 18, 2026) governs logistics - scheduling, identification, calculators, and testing rules. Both documents are official sources, and neither should be confused with materials from an unrelated credential that happens to share the AZ-ACR acronym.
For a broader look at how the credential fits into the licensing process, see AZ-ACR Certification and What Is AZ-ACR?.
Exam Format: Questions, Time, and Passing Score
The trade exam is delivered as computer-based multiple choice, and candidates can choose between test-center delivery or remote-proctored testing. Regardless of location, the structure is fixed:
- 80 scored questions
- 70% required to pass
- 210 minutes allotted
- PSI may insert 5-10 unscored experimental questions within that same time window, meaning your actual question count on screen may run higher than 80
Those experimental items are not identified as such during the test, so there's no way to skip them or know which ones don't count. The practical implication is that pacing should assume up to 90 questions in 210 minutes, not exactly 80. For a full breakdown of what "passing" actually requires numerically, check AZ-ACR Passing Score 2026: Exactly What You Need to Pass.
Key Takeaway
Treat the 210-minute clock as covering roughly 85-90 questions, not a clean 80, since unscored experimental items are mixed in without labeling.
The 12 Domains Behind the AZ-ACR Acronym
What actually separates AZ-ACR from a generic "HVAC test" is the specific 12-domain outline PSI uses to build every exam form. The official question allocation is fixed per domain, which means you can rank your study priorities by weight instead of guessing:
| Domain | Topic | 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 the joint-largest subject areas at 12 questions each - together they account for a large chunk of the exam. That's a deliberate design choice by the outline, not an accident, and it tells you where the bulk of your study hours should go.
Refrigeration, Air Conditioning, and Warm Air Heating
These three domains carry equal weight and should receive equal study attention rather than favoring whichever topic feels most familiar from field experience.
- Refrigeration cycle components, charging, and troubleshooting logic
- Cooling load fundamentals and equipment selection scenarios
- Combustion, venting, and heat exchanger principles for warm-air systems
Controls and Motors
At 8 questions, this is the fourth-heaviest domain and often underestimated by candidates who focus only on refrigeration mechanics.
- Motor types, starting methods, and protection devices
- Thermostats, relays, and control sequencing logic
- Electrical safety fundamentals as applied to HVAC equipment
The remaining eight domains - Boilers, Ventilation, Evaporative Coolers, Fuel Piping Systems, Water Piping Systems, Steam/Hot/Chilled/Condensing Water, Testing/Balancing/Inspections, and Sizing and Estimating - each carry 4 or 5 questions. None should be ignored, since a single missed domain can still swing a borderline score. Our AZ-ACR Exam Domains 2026 guide walks through study priorities for each of these smaller domains individually.
Fees, Registration, and Retake Rules
Understanding what "AZ-ACR" costs and how retakes work is part of understanding what it means as a licensing requirement, not just a content test. The trade examination fee is $66 per attempt. There is a separate, required Arizona Statutes and Rules Exam (SRE), an online-only test covering Arizona contractor law rather than trade content, which costs $61. These are two distinct exams with two distinct fees - passing one does not substitute for the other.
If you don't pass the trade exam on your first try, the waiting period before retesting is 30 days. That waiting period jumps to 90 days starting with your fourth and subsequent attempts, so repeated unprepared attempts get progressively more expensive in both time and money. A full cost breakdown, including how the SRE and trade exam fees stack up, is available in AZ-ACR Certification Cost 2026: Complete Pricing Breakdown.
What You Can (and Can't) Bring Into the Exam
Part of what makes the AZ-ACR trade exam distinct from a closed-book knowledge test is its open-book format for select references. Approved open-book materials are:
- OSHA 29 CFR Part 1926 or PSI's selected safety reference, with the latest available amendments
- The 2018 International Fuel Gas Code
- The 2018 International Mechanical Code
Any other textbooks listed on the outline are study-only references - you can learn from them, but you cannot bring them into the test session. Within the approved references, candidates are allowed advance highlighting, underlining, annotations, and permanent tabs. What's prohibited is bringing in loose additional papers or writing in the references during the actual test session. Remote testing adds further restrictions: no scratch paper and no breaks are permitted during a remote-proctored session.
The general bulletin also permits a silent, nonprinting, nonprogrammable, nonscientific calculator - a detail worth confirming before test day since bringing an unapproved calculator can cause delays or disqualify its use entirely.
Key Takeaway
Tab and highlight your code books before test day - annotations must be done in advance, not during the exam session itself.
Who Actually Needs the AZ-ACR
The AZ-ACR trade exam is aimed at the qualifying party for an Arizona C-39 (commercial) or R-39R (residential) HVAC/refrigeration contractor license - typically an experienced technician or field supervisor stepping into a licensing or business-owner role. It's relevant to:
- HVAC technicians moving toward running or qualifying a licensed contracting company
- Refrigeration mechanics expanding into commercial or residential contractor work
- Company owners who need a qualifying party credential on file with the ROC
- Anyone researching Arizona air conditioning and refrigeration contractor exam requirements before committing to the license path
If you're trying to figure out whether pursuing this license path makes financial sense for your career, Is the AZ-ACR Certification Worth It? Complete ROI Analysis 2026 and AZ-ACR Jobs cover that angle in more depth. General salary considerations for licensed HVAC contractors are discussed in AZ-ACR Salary Guide 2026: Complete Earnings Analysis.
How to Approach Prep Without Wasting Time
Because the domain weighting is published and fixed, the smartest prep sequence follows the point value, not personal comfort level. A simple study approach built around the outline looks like this:
Refrigeration, Air Conditioning, Warm Air Heating
- These three domains total 36 of the scored questions - start here first
- Work through original trade scenarios rather than memorized definitions
- Review cycle diagrams and system troubleshooting logic daily
Controls and Motors, plus mid-weight domains
- Cover Controls and Motors (8 questions) alongside Fuel Piping, Water Piping, Steam/Hot/Chilled/Condensing Water, and Testing/Balancing/Inspections (5 each)
- Practice open-book navigation in the 2018 IFGC and 2018 IMC so you're fast, not searching blindly
Remaining domains and full timed practice
- Finish Boilers, Ventilation, Evaporative Coolers, and Sizing and Estimating (4 each)
- Run full 210-minute timed practice sets to build pacing habits
- Confirm calculator and reference rules one final time before scheduling
This isn't a generic spaced-repetition template dropped in from another field - it's sequenced specifically around the AZ-ACR's fixed question allocation, so the heaviest-weighted domains get the most runway. For a deeper walkthrough of pass strategy, see AZ-ACR Study Guide 2026: How to Pass on Your First Attempt, and if you're still gauging how tough this exam really is relative to your field experience, How Hard Is the AZ-ACR Exam? Complete Difficulty Guide 2026 and AZ-ACR Pass Rate 2026: What the Data Shows are worth reading before you schedule.
Once you've reviewed the outline, running realistic timed questions on our practice test platform is the fastest way to confirm which domains still need work before you commit to a test date. Rather than passively rereading code text, active recall through practice questions modeled on the trade outline tends to surface weak spots you didn't know you had. A condensed reference before test day is available in AZ-ACR Cheat Sheet 2026: One-Page Review of Must-Know Facts.
FAQ
On this site, yes - AZ-ACR specifically means the Arizona Registrar of Contractors' R-39R/C-39 (CR-39) Air Conditioning and Refrigeration trade examination administered through PSI. Other organizations use the same abbreviation for unrelated credentials, so always confirm context when reading outside sources.
No. The trade exam (80 questions, 70% passing, 210 minutes, $66) tests HVAC/refrigeration content across 12 domains. The Arizona Statutes and Rules Exam (SRE) is a separate online exam covering contractor law and costs $61. Both are typically required for licensure.
Refrigeration, Air Conditioning, and Warm Air Heating each contribute 12 questions. Controls and Motors contributes 8. Fuel Piping Systems, Water Piping Systems, Steam/Hot/Chilled/Condensing Water, and Testing/Balancing/Inspections contribute 5 each. Boilers, Ventilation, Evaporative Coolers, and Sizing and Estimating contribute 4 each.
You must wait 30 days before retesting for your second and third attempts. If you're still not successful by a fourth attempt, the required waiting period increases to 90 days.
Only the approved open-book references - OSHA 29 CFR Part 1926 (or PSI's equivalent selection), the 2018 International Fuel Gas Code, and the 2018 International Mechanical Code - are allowed in the testing room. Other textbooks on the outline are for study purposes only and cannot be brought into the session.