- What the AZ-ACR Trade Exam Actually Tests
- Registration, Fees, and Scheduling Mechanics
- Domain-by-Domain Breakdown and Question Weight
- Open-Book Strategy: References You're Allowed to Use
- A Domain-Weighted Study Timeline
- Don't Forget the Separate SRE Track
- Retake Rules and What Happens If You Fail
- Who Hires AZ-ACR-Licensed Qualifying Parties
- Frequently Asked Questions
- The trade exam has 80 scored questions plus up to 10 unscored ones, with 210 minutes and a 70% passing requirement.
- Refrigeration, Air Conditioning, and Warm Air Heating each carry 12 questions - study these three domains first.
- Only OSHA 29 CFR 1926 (or PSI's selection), the 2018 IFGC, and the 2018 IMC may be used open-book during testing.
- The trade exam costs $66 per attempt; the online Statutes and Rules Exam (SRE) is a separate $61 test.
What the AZ-ACR Trade Exam Actually Tests
The Arizona R-39R/C-39 (CR-39) exam is the non-solar residential/commercial air conditioning and refrigeration trade examination administered through PSI Services LLC on behalf of the Arizona Registrar of Contractors (ROC). This is not a generic HVAC certificate - it's the specific trade competency test a qualifying party sits before the ROC will issue a C-39 or R-39R contractor's license. If you've landed here searching for an "Arizona C-39 exam" or "R-39R HVAC exam" resource, this is the credential you're preparing for.
The exam is delivered as computer-based multiple choice, and candidates can choose either a physical test center or remote-proctored delivery. Both formats draw from the same trade content outline, last revised June 8, 2023, with PSI's general candidate bulletin updated February 18, 2026. For a plain-language explainer of what this credential is and who needs it, see What Is AZ-ACR? and the related AZ-ACR Meaning breakdown.
Registration, Fees, and Scheduling Mechanics
Candidates register the R-39R/C-39 trade exam through PSI at a cost of $66 per attempt. This is separate from the Arizona Statutes and Rules Exam (SRE), an online-only test priced at $61 that covers legal and regulatory content rather than trade knowledge. Many first-time applicants mistakenly assume one fee covers both - it doesn't, and budgeting for both exams up front avoids scheduling surprises. A full cost breakdown, including how these fees relate to license renewal and bonding, is covered in AZ-ACR Certification Cost 2026: Complete Pricing Breakdown.
Before you schedule, confirm your eligibility path. The ROC generally requires four years of practical or management-level trade experience, with at least two of those years falling within the preceding ten. Qualifying technical training can offset up to two of the four required years. If your exam results are more than two years old by the time you submit your license application, they expire and you'll need to retest. Full eligibility mechanics, including how training substitutions work, are detailed in AZ-ACR Requirements 2026: Eligibility, Prerequisites & How to Qualify.
Key Takeaway
Treat the $66 trade exam and $61 SRE as two separate study and scheduling projects - they test different content and are booked independently through PSI.
Domain-by-Domain Breakdown and Question Weight
The single biggest strategic advantage available to any candidate is knowing exactly how the 80 scored questions are distributed across the 12 domains. This isn't guesswork - it's published directly in PSI's trade outline, and it should dictate how you allocate study hours.
| Domain | Question Count |
|---|---|
| 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 apiece - together they account for 36 of the 80 scored questions, or roughly 45% of the exam. No other domain approaches that weight, which is why a serious study plan treats these three as non-negotiable mastery areas rather than review topics. For a deep dive into every domain's specific subtopics and typical scenario framing, read AZ-ACR Exam Domains 2026: Complete Guide to All 12 Content Areas.
Refrigeration
Expect scenario-based questions on refrigerant cycles, component function, charging procedures, and troubleshooting logic rather than pure definitions.
- Compressor, condenser, evaporator, and metering device interactions
- Diagnosing symptoms tied to superheat/subcooling readings
- Recovery, recycling, and reclaiming procedures
Air Conditioning
Covers residential and light commercial cooling systems, airflow, and equipment selection logic.
- Split-system and packaged unit configurations
- Duct static pressure and airflow troubleshooting
- Load-related sizing decisions tied to Domain 12
Warm Air Heating
Focuses on gas- and electric-fired warm air furnaces, venting, and combustion safety.
- Furnace ignition systems and safety controls
- Venting requirements referencing the 2018 IFGC
- Heat exchanger inspection and failure indicators
Open-Book Strategy: References You're Allowed to Use
The AZ-ACR trade exam is partially open-book, but only for a narrow, specific set of references. Approved materials are OSHA 29 CFR Part 1926 (or PSI's substituted equivalent) with its latest available amendments, the 2018 International Fuel Gas Code, and the 2018 International Mechanical Code. Every other textbook listed in the outline is a study-only resource - you cannot bring it into the testing session.
Because these books can be highlighted, underlined, and tabbed in advance, your prep time should include physically building a navigable reference system: color-coded tabs by chapter, margin notes keyed to common question phrasing, and a memorized index of where clearance tables, sizing charts, and venting requirements live. Loose separate papers are prohibited, and you cannot write in the references during the actual test session - all annotation must be done beforehand.
A silent, nonprinting, nonprogrammable, nonscientific calculator is allowed under the general PSI bulletin - confirm your device meets this standard before test day, since calculators with graphing or programmable functions will be rejected at check-in.
A Domain-Weighted Study Timeline
Generic study techniques like spaced repetition and timed practice blocks only help if they're pointed at the right material. Here's a six-week structure built around the AZ-ACR domain weights rather than a one-size-fits-all template.
Refrigeration Foundations
- Refrigerant cycle mechanics and component roles
- Practice diagnosing based on pressure/temperature readings
Air Conditioning Systems
- Airflow, ductwork, and equipment matching scenarios
- Cross-reference sizing concepts with Domain 12
Warm Air Heating and Controls/Motors
- Furnace combustion, venting, and safety cutoffs
- Motor types, starting components, and control wiring logic
Mid-Weight Domains
- Fuel piping, water piping, and steam/hot/chilled/condensing water systems
- Practice reading the 2018 IFGC and 2018 IMC tables directly
Smaller Domains and Review
- Boilers, ventilation, evaporative coolers, testing/balancing/inspections, sizing/estimating
- Timed practice sets mixing all 12 domains proportionally
Simulated Exam Conditions
- Full 80-question timed run using only approved open-book references
- Final SRE review if not already scheduled separately
If you want a condensed, printable version of the highest-yield facts to review the night before your test, bookmark AZ-ACR Cheat Sheet 2026: One-Page Review of Must-Know Facts. For a broader look at where most candidates lose points, How Hard Is the AZ-ACR Exam? Complete Difficulty Guide 2026 walks through common difficulty patterns without relying on invented statistics.
Don't Forget the Separate SRE Track
Passing the trade exam only satisfies part of the licensing requirement. The Arizona Statutes and Rules Exam (SRE) is a distinct, online-only test at $61 that covers contractor law, licensing statutes, and business regulations rather than technical HVAC content. Because it's built on statutory material referenced in Arizona Revised Statutes §32-1122 and §32-1123.01, it rewards a completely different study approach - reading comprehension and regulatory recall rather than mechanical troubleshooting.
Many candidates prepare for the trade exam and SRE in parallel but should study them as separate subjects with separate materials. Trying to cram statutory language into the same session as refrigerant cycle diagrams tends to blur retention for both.
Retake Rules and What Happens If You Fail
If you don't reach the 70% passing threshold on your first attempt, Arizona's testing rules require a 30-day waiting period before you can retest. This waiting period escalates: candidates on their fourth or later attempt must wait 90 days before scheduling again. That escalation makes it costly, in both time and the $66 retake fee, to walk in underprepared on domains you already know are weak.
Key Takeaway
Because retakes cost $66 each and trigger mandatory waiting periods, front-load your study on Refrigeration, Air Conditioning, and Warm Air Heating - the three domains that together determine nearly half your score.
For a numbers-only view of what "passing" actually requires - how the 70% threshold interacts with the 80 scored questions - see AZ-ACR Passing Score 2026: Exactly What You Need to Pass. If you're still mapping out your testing calendar, AZ-ACR Exam Dates 2026: Testing Windows, Deadlines & Scheduling covers how scheduling windows and waiting periods interact in practice.
Who Hires AZ-ACR-Licensed Qualifying Parties
The R-39R/C-39 license underpins the qualifying party role for residential and commercial air conditioning and refrigeration contracting businesses across Arizona. Employers and clients look for this license specifically when a business needs a designated qualifying party who can legally pull permits and take responsibility for installation and service work covering refrigeration systems, air conditioning, warm air heating, boilers, ventilation, evaporative coolers, and related piping systems.
Because the license is tied to a specific classification (R-39R residential or C-39 commercial), it's worth confirming which classification actually matches the work you intend to perform before you register for the exam - the wrong classification choice can create licensing gaps down the line. If you're evaluating whether pursuing this license makes sense for your career path, Is the AZ-ACR Certification Worth It? Complete ROI Analysis 2026 and AZ-ACR Jobs offer additional context, and AZ-ACR Salary Guide 2026: Complete Earnings Analysis looks at earnings considerations tied to the license.
Remember also that license terms are biennial - you'll renew every two years, and license fees plus bond obligations are handled separately from the exam fees discussed above. Keep your exam results current, since they must fall within the two years preceding your license application.
Frequently Asked Questions
The trade outline specifies 80 scored questions with a 210-minute time limit. PSI may also insert 5-10 unscored experimental questions that look identical to scored items, so the total question count you see on screen may be higher than 80.
Refrigeration, Air Conditioning, and Warm Air Heating each carry 12 questions - the three largest domains on the outline. Prioritizing these before moving to smaller domains like Boilers or Sizing and Estimating (4 questions each) makes the best use of limited hours.
No. Only OSHA 29 CFR Part 1926 (or PSI's selected equivalent), the 2018 International Fuel Gas Code, and the 2018 International Mechanical Code are approved as open-book references. Other textbooks named in the outline are for study purposes only and cannot be brought into the testing session.
No. The SRE is a separate online exam costing $61, distinct from the $66 trade exam fee. They test different content and are scheduled independently.
A failed attempt requires a 30-day wait before retesting. Once you reach a fourth attempt, the waiting period extends to 90 days, so it's worth reviewing your weakest domains carefully before scheduling another sitting.
For a full walkthrough of every stage covered here - from eligibility through exam-day logistics - the complete AZ-ACR Study Guide 2026 ties these sections together, and the practice test platform remains the most direct way to test your readiness against the actual domain weighting before exam day.