What Does the Arizona C-58 License Cover?

Arizona calls C-58 the Comfort Heating, Ventilating and Evaporative Cooling classification.

The scope includes installing, altering, and repairing:

• Warm air heating systems.
• Gas-fired furnaces.
• Space heaters.
• Ventilation systems.
• Evaporative cooling units.
• Combinations of these systems.

Related work can include ductwork, air filters, pneumatic and electrical controls, control piping, thermal insulation, acoustical insulation, vibration isolation, liquid fuel piping and tanks, water piping, gas piping, and testing and balancing of air-handling systems.

The classification also allows certain electrical work associated with the covered equipment, including adding a new circuit to an existing service panel or sub-panel when needed. Installing a new service panel or sub-panel is outside this scope.

C-58 vs. CR-58: What Is the Difference?

PSI uses the same technical trade examination outline for this exam path, so preparation for the tested trade topics is closely related.

Your Arizona ROC application still needs to identify the classification that matches the work your company plans to perform.

Step 1: Confirm the Experience and Exam Requirements

Arizona currently lists CR-58 with a minimum of two years of qualifying hands-on and/or managerial experience.

The standard licensing path includes:

• The Arizona Statutes and Rules Exam, commonly called the SRE.
• The applicable C-58/CR-58 trade examination.

Waivers may apply in specific situations, so candidates should check their individual eligibility before registering and paying for an examination.

Review the Arizona Registrar of Contractors classification requirements before beginning your application.

Step 2: Know the Exam Numbers

The time limit is reasonable when you know your references.

It becomes much less comfortable when you spend seven minutes searching the Plumbing Code for a question that belonged in the Mechanical Code.

Step 3: Learn the Official Exam Breakdown

Warm Air Heating, Ventilation, Piping and Tubing, and Ducts and Insulation account for 40 of the 60 questions.

That is two-thirds of the test, so these four areas deserve most of your study time.

Step 4: Make Warm Air Heating Your Biggest Priority

Warm Air Heating contains 15 questions, making it the largest category on the examination.

Review:

• Gas-fired furnaces.
• Space heaters.
• Combustion air.
• Venting.
• Flues.
• Gas appliance installation.
• Required clearances.
• Equipment location.
• Heating-system operation.
• Air distribution.
• Safety controls.

The International Fuel Gas Code and International Mechanical Code are especially important in this section.

Learn which book normally contains each type of heating requirement. Searching all of your books every time is not a study strategy. It is a paper workout.

Step 5: Study Ventilation Carefully

Ventilation contributes nine questions, making it the second-largest individual category.

Review:

• Mechanical ventilation.
• Outdoor air.
• Exhaust systems.
• Air movement.
• Equipment ventilation.
• Combustion ventilation.
• Air inlets and outlets.
• Air-handling equipment.
• Testing and balancing concepts.

Ventilation questions may combine practical trade knowledge with specific Mechanical Code requirements.

Understand why airflow is required and then learn where the code tells you exactly how much is required.

Step 6: Learn Piping and Tubing

Piping and Tubing accounts for eight questions.

The license scope can include gas piping, water piping, control piping, and liquid fuel piping related to the covered systems.

Review:

• Gas-pipe sizing.
• Pipe materials.
• Tubing materials.
• Valves.
• Connections.
• Supports.
• Pressure testing.
• Water-supply connections.
• Piping protection.
• Fuel-system requirements.

Learn when the International Fuel Gas Code controls the answer and when the International Plumbing Code is the better reference.

Step 7: Put Serious Time Into Ducts and Insulation

Ducts and Insulation also contains eight questions.

Review:

• Duct materials.
• Duct construction.
• Supports.
• Joints and connections.
• Flexible ducts.
• Duct sizing.
• Duct insulation.
• Thermal insulation.
• Acoustical insulation.
• Vibration isolation.
• Air leakage.

The exam may test how ducts are sized, supported, insulated, sealed, and connected.

Air is not especially interested in the designer's intentions. It follows pressure and whatever path the duct system gives it.

Step 8: Review Controls and Motors

Controls and Motors contributes six questions.

Study:

• Thermostats.
• Relays.
• Transformers.
• Motor operation.
• Motor controls.
• Pneumatic controls.
• Electrical controls.
• Safety controls.
• Basic troubleshooting.

Understand the basic relationship between the controls, motors, equipment, and safety devices.

The classification permits certain electrical work associated with covered equipment, but it does not turn the license into an unrestricted electrical classification.

Step 9: Understand Evaporative Cooling

Evaporative Cooling contributes five questions.

Review:

• Evaporative cooler operation.
• Cooling media.
• Water distribution.
• Pumps.
• Float assemblies.
• Fans and blowers.
• Airflow.
• Maintenance.
• Water supply.
• System performance.

Understand how evaporation removes heat from the air and how temperature, humidity, water distribution, and airflow affect performance.

Arizona provides plenty of opportunities to see these systems operating in their natural habitat.

Step 10: Prepare for Inspections and Testing

Inspections and Testing contributes five questions.

Review:

• System inspection.
• Gas-piping tests.
• Airflow testing.
• System balancing.
• Equipment startup.
• Operating checks.
• Safety-device testing.
• Leak testing.

The classification includes testing and balancing of air-handling systems, so this topic deserves real study time.

Installation gets equipment into the building. Testing tells you whether it was worth carrying it there.

Step 11: Practice Sizing and Estimating

Sizing and Estimating contains four questions.

Practice:

• Airflow calculations.
• Duct sizing.
• Heating-load concepts.
• Equipment sizing.
• Gas-pipe sizing.
• Material quantities.
• Basic project estimating.

ACCA Manual J, Manual D, and the ACCA Ductulator are useful for learning load calculations and duct-design concepts even though they are study-only references for this exam.

Step 12: Get the Correct Approved Exam References

The current PSI outline identifies four main references that may be used in the examination center:

• 29 CFR Part 1926 OSHA, with applicable current amendments or approved PSI selections.
• 2018 International Fuel Gas Code.
• 2018 International Mechanical Code.
• 2018 International Plumbing Code.

You can browse the Arizona contractor exam preparation collection for Arizona reference books, preparation materials, tabs, and related resources.

Step 13: Know the Study-Only References

PSI also lists study materials that may be used when developing exam questions but are not permitted inside the testing center.

These include:

• ACCA Ductulator.
• ACCA Manual D.
• ACCA Manual J.
• Modern Refrigeration and Air Conditioning, 19th or 20th Edition.

These references are still valuable during preparation.

Manual J helps with load calculations. Manual D and the Ductulator help with air-distribution and duct-sizing concepts. Modern Refrigeration and Air Conditioning provides broader technical knowledge involving heating, cooling, motors, controls, airflow, and troubleshooting.

Use them while studying, then leave them outside the exam room if PSI does not list them as permitted references.

Step 14: Prepare Your Books Before Test Day

Approved references may be prepared before the examination.

Candidates may generally:

• Highlight approved books.
• Underline important passages.
• Annotate them before testing.
• Index the references.
• Use permanent tabs.

Permanent tabs must be strongly attached. Temporary tabs, Post-it notes, and removable markers are not allowed.

Unauthorized loose papers should not be inserted into approved references.

Printed approved references should be properly bound.

The best time to organize the books is several days or weeks before the test. Organizing them in the PSI parking lot is a terrible sequel to procrastination.

Step 15: Learn Which Code Book to Open First

• International Fuel Gas Code: gas piping, gas appliances, combustion air, venting, and fuel-gas requirements.
• International Mechanical Code: heating, ventilation, ducts, exhaust, mechanical equipment, and air systems.
• International Plumbing Code: water piping and plumbing connections related to covered equipment.
• OSHA: employee protection and construction safety.

Practice deciding which reference probably contains the answer before opening a book.

This simple habit can save a surprising amount of time over 60 questions.

Step 16: Use a Four-Week Study Plan

Step 17: Practice Under the Real Time Limit

Set a timer for 150 minutes and complete 60 questions.

A practical strategy is:

1. First pass: Answer questions you know immediately.
2. Second pass: Complete quick reference lookups.
3. Third pass: Return to calculations and difficult code questions.

Do not spend eight minutes arguing with one duct-sizing problem while easier questions wait farther down the test.

Your goal is to pass the entire exam, not defeat one question in personal combat.

Step 18: Practice With an Approved-Style Calculator

Use a basic silent, nonprinting, non-programmable calculator while practicing.

Practice calculations involving:

• Airflow.
• Basic equipment sizing.
• Estimating.
• Gas-pipe sizing.
• Unit conversions.

Use the same type of calculator during your practice exams so it feels completely familiar on test day.

Step 19: Know the Current PSI Fees and Retake Rules

The current fee for one Arizona trade examination is $66.

The Arizona Statutes and Rules Exam currently costs $61.

Candidates who do not pass must currently wait 30 days before retesting.

After three unsuccessful attempts, the current rules require a 90-day waiting period before another attempt.

If you receive diagnostic information after an unsuccessful attempt, use it to decide what to study next.

Step 20: Remember the Arizona Statutes and Rules Exam

The technical trade examination and the Arizona Statutes and Rules Exam cover different subjects.

The trade exam focuses on heating, ventilation, ducts, piping, motors, controls, evaporative cooling, testing, and related technical work.

The SRE focuses on Arizona contractor laws, rules, and licensing requirements.

Review the Arizona ROC contractor licensing process for current application information.

Step 21: Passing the Exam Is Only Part of Getting Licensed

Passing the C-58 or CR-58 trade exam does not automatically issue an Arizona contractor license.

The full process can also include:

• Selecting the correct classification.
• Designating a qualifying party.
• Documenting qualifying experience.
• Completing the SRE when required.
• Passing the applicable trade examination.
• Completing required background checks.
• Obtaining the appropriate contractor license bond.
• Providing identification.
• Providing business information.
• Submitting the Arizona ROC application.
• Paying applicable licensing fees.

Arizona C-58 and CR-58 Exam Roadmap

1. Confirm whether you need C-58 or CR-58.
2. Verify the current experience requirement.
3. Determine whether any waiver applies.
4. Complete or prepare for the Arizona SRE.
5. Review the current PSI content outline.
6. Obtain the approved 2018 code references and OSHA material.
7. Separate exam-room books from study-only references.
8. Prepare approved references with permanent tabs.
9. Study Warm Air Heating heavily.
10. Study Ventilation carefully.
11. Review Piping and Tubing.
12. Study Ducts and Insulation.
13. Review Controls and Motors.
14. Study Evaporative Cooling.
15. Practice inspections and testing procedures.
16. Practice sizing and estimating.
17. Practice fast reference lookups.
18. Take full 150-minute practice exams.
19. Review every missed question.
20. Complete the Arizona ROC licensing process.

Arizona C-58 and CR-58 Exam Prep Resources

Conclusion: How to Put Everything Together

Passing the Arizona C-58 or CR-58 Evaporative Cooling and Ventilating Contractor exam comes down to preparation, organization, and understanding where your points are hiding.

The first thing to remember is that this is not simply a swamp-cooler exam. Evaporative Cooling accounts for five questions, while Warm Air Heating alone accounts for 15. Ventilation adds another nine questions, and Piping and Tubing plus Ducts and Insulation contribute eight questions each. Those numbers tell you exactly where your study time should go.

Start with Warm Air Heating. Learn furnaces, combustion air, flues, venting, appliance installation, clearances, and safety controls. Then move into ventilation and air-distribution systems. Understand exhaust, outdoor air, duct construction, insulation, airflow, and balancing.

Piping is another major area. Be prepared to work with gas, water, fuel, and control piping concepts. Learn how to identify whether a question belongs in the Fuel Gas Code, Mechanical Code, or Plumbing Code.

Your approved books can be one of your biggest advantages if you prepare them correctly. Permanent tabs, highlighting, annotations, and a strong understanding of each book's index can save valuable minutes. However, tabs only help if you already know what they mean. Practice with the books repeatedly before exam day.

Timed practice is also important. Sixty questions in 150 minutes gives you about two and a half minutes per question. Some questions may take 30 seconds. Others may require several minutes of code research or calculations. Learning when to move on can protect your score.

Pay attention to the study-only references too. Manual J, Manual D, the ACCA Ductulator, and Modern Refrigeration and Air Conditioning can strengthen the knowledge behind the questions even though they do not go into the testing center with you.

Finally, remember that passing PSI is one part of the larger Arizona licensing process. Experience, the SRE when required, background checks, bonding, application requirements, and other Arizona ROC steps still matter.

If you approach the process in that order, the exam becomes much more manageable. Know the scope, learn the exam breakdown, get the correct books, organize them, study the high-value topics, practice under a timer, and review every mistake. That is a much stronger plan than hoping Arizona's dry climate somehow gives you bonus points.

Plain-Language Summary

The Arizona C-58 and CR-58 contractor exam is for contractors working with comfort heating, ventilation, evaporative cooling, and related systems. Even though evaporative cooling appears in the license name, the test covers a much wider group of subjects.

The exam currently contains 60 questions. Candidates receive 150 minutes and need a score of at least 70% to pass. The largest section is Warm Air Heating with 15 questions. Ventilation has nine questions. Piping and Tubing and Ducts and Insulation each have eight questions. Controls and Motors has six questions. Evaporative Cooling and Inspections and Testing each have five questions. Sizing and Estimating has four questions.

This breakdown is useful because it tells you where to spend your study time. Heating, ventilation, piping, and duct systems make up two-thirds of the exam. Candidates who focus only on evaporative coolers may be underprepared.

The main approved code references include the 2018 International Fuel Gas Code, 2018 International Mechanical Code, 2018 International Plumbing Code, and OSHA construction regulations. Candidates should learn which book covers which type of question.

The Fuel Gas Code is important for gas piping, gas appliances, combustion air, and venting. The Mechanical Code is important for heating, ventilation, ducts, exhaust, and mechanical equipment. The Plumbing Code can help with water-related connections and piping. OSHA covers construction safety.

Candidates should also study Manual J, Manual D, the ACCA Ductulator, and Modern Refrigeration and Air Conditioning. These materials can help with load calculations, duct design, airflow, equipment sizing, and technical knowledge, although they are currently considered study-only references.

Preparing the approved books can make the test easier. Use permanent tabs, highlighting, and notes according to PSI rules. More importantly, practice using the books before the exam. A tabbed book is only useful when you know which tab to grab.

Timed practice is another important part of preparation. Complete 60-question practice tests using the real 150-minute limit. Answer easy questions first, then handle reference lookups, and return to difficult calculations last.

Passing the exam does not automatically give you an Arizona contractor license. Applicants must still satisfy applicable Arizona ROC requirements involving experience, the Statutes and Rules Exam when required, background checks, bonding, and the contractor license application.

For Arizona exam books and preparation resources, browse the Contractor Exam Preps Arizona collection.