- What the Data Actually Shows About STAR Pass Rates
- Why NITC Does Not Publish a Pass Rate
- What the Published Numbers Imply About Difficulty
- Who Sits the Exam: A Self-Selected Candidate Pool
- Where Candidates Likely Lose Points: The Nine Preparation Categories
- Exam Format and Fee Mechanics That Affect Your Outcome
- Turning the Missing Data Into a Preparation Plan
- Frequently Asked Questions
- NITC does not publicly disclose a pass rate for STAR Commercial Refrigeration Mastery, so any quoted percentage is unverified.
- The cut score is 83%, stated in the candidate bulletin as 161 correct answers out of 194 multiple-choice questions.
- Candidates need three years of documented commercial refrigeration experience, so the test-taker pool is already experienced.
- The exam is closed-book, runs 2.5 hours, and the current NITC price list shows $150 for the proctored original exam.
What the Data Actually Shows About STAR Pass Rates
If you searched for the STAR Commercial Refrigeration Mastery pass rate hoping for a clean percentage, here is the honest answer: there isn't one. The National Inspection, Testing and Certification Corporation (NITC), which administers the program with United Association industry expertise, does not publicly disclose how many candidates pass. The Candidate Bulletin for STAR Certifications (Exhibit #68, Rev 05-24-23) does not list one. The current NITC price list does not list one. The official study guide does not list one.
That matters because a lot of exam-prep content online fills this vacuum with confident-sounding numbers. Treat any specific "STAR pass rate" figure you see with suspicion, including figures that appear to belong to other credentials that happen to share the acronym. This article sticks to what is verifiable for STAR Commercial Refrigeration Mastery and then reasons carefully from the published exam design.
Why NITC Does Not Publish a Pass Rate
NITC is a certification administrator, not a training vendor. Its public-facing documents focus on eligibility, scheduling, pricing, and exam rules. Publishing outcome statistics is a choice some certifying bodies make and others don't, and NITC's STAR materials fall in the second group.
There are a few practical reasons a body might not publish rates for a credential like this:
- Small, specialized candidate volume. Commercial refrigeration mastery is a niche trade credential, and percentages from small samples swing widely from year to year.
- Multiple pathways. Candidates arrive from apprenticeship programs, employer-sponsored training, and field experience, which makes a single blended number hard to interpret.
- Competency framing. The exam is positioned as a verification of experienced-technician competence rather than a ranking exercise.
These are reasonable explanations, not confirmed NITC statements. What you can rely on is the absence itself: if you cannot find an official pass rate, none has been released. For related questions about the exam's reputation, see our companion piece on how hard the STAR exam is.
What the Published Numbers Imply About Difficulty
You can't compute a pass rate from the published specs, but you can understand the pressure the exam design creates. Here is the structure side by side with what it means for you.
| Published Fact | Value | What It Means for Candidates |
|---|---|---|
| Question count | 194 multiple-choice | Broad sampling of the trade; one weak area is hard to hide |
| Time allowed | 2.5 hours | Roughly 46 seconds per question on average, so pacing matters |
| Passing score | 83% (161 correct) | You can miss at most 33 questions |
| Reference materials | Closed-book, no electronic devices | Everything must be recalled from memory |
| Prerequisite | 3 years documented experience (or third year of a qualifying training program) | Candidates are working technicians, not newcomers |
The 83% threshold is the headline number. With 194 questions and a requirement of 161 correct, your margin for error is 33 questions. That is a tight buffer for a comprehensive exam, and it explains why the credential is positioned for experienced technicians. For a deeper treatment of the cut score itself, read our guide to the STAR passing score.
Who Sits the Exam: A Self-Selected Candidate Pool
One reason pass-rate comparisons across certifications are misleading is that candidate pools differ enormously. STAR Commercial Refrigeration Mastery requires either three years of documented work experience installing and servicing commercial refrigeration systems, or documentation of being in the third year of a commercial refrigeration training program involving installation and servicing.
That prerequisite filters the pool before anyone pays a fee. People sitting for this exam are typically:
- Journeyman-level service technicians working on walk-in coolers, reach-ins, display cases, and ice machines
- Third-year apprentices or trainees in commercial refrigeration programs
- Supermarket and food-service refrigeration technicians who service rack systems
- Technicians whose employers or union programs want a recognized credential on the roster
Because everyone starts with field exposure, a high pass rate would not be surprising in principle, but the 83% cut score and the breadth of the exam cut the other way. Experience helps most with the hands-on topics and least with the topics many technicians rarely touch in daily work, such as formal electrical theory, controls terminology, or the business side of the trade. Full eligibility details are in our STAR requirements guide.
Where Candidates Likely Lose Points: The Nine Preparation Categories
An important accuracy note: the current candidate bulletin describes a comprehensive commercial-refrigeration examination scope but does not publish percentage weights for individual topics. The nine headings below come from the official UA STAR Commercial Refrigeration Study Guide (Rev. 1.1, dated 4/22/07) and are unweighted preparation categories. They are useful for organizing your review, but they should not be treated as an exhaustive official exam blueprint. For a walk-through of each, see our complete guide to the nine STAR content areas.
Since NITC doesn't release performance data by category, the following is reasoned analysis, not statistics: it describes where experienced technicians commonly have uneven preparation.
Refrigeration Fundamentals and System Operation
These two categories (Domains 1 and 2) cover the refrigeration cycle, pressure-temperature relationships, superheat and subcooling, and how components behave in a running system.
- Field technicians know these intuitively but may not recall textbook definitions precisely
- Closed-book format rewards clear vocabulary, not just a good feel for the equipment
Basic Electricity and Controls
Domains 3 and 4 move into electrical theory and control devices. Many technicians troubleshoot electrical faults daily without formally reviewing the underlying concepts.
- Expect questions that depend on understanding circuits, not just replacing failed parts
- Controls questions reward knowing what a device is designed to do and how it signals a fault
Rack Systems, Self-Contained Units, and Ice Machines
Domains 5, 6, and 7 are equipment-specific. Your day job determines your comfort here: a supermarket rack technician and a restaurant-equipment technician see very different machines.
- Rack-heavy candidates should still review ice machine operation and vice versa
- Cross-training on equipment you rarely service is where focused review pays off most
Auxiliary Systems and Business and Customer Relations
Domains 8 and 9 are the ones technicians most often under-prepare. Auxiliary systems cover supporting components around the main refrigeration loop, while Business and Customer Relations tests professional practice rather than mechanical skill.
- Easy to dismiss as "soft" material, but each question counts the same as any other
- With only 33 questions of margin, giving away a whole category is costly
The pattern to take from this: the exam rewards breadth. A technician who is excellent at rack systems but weak on electricity and customer relations can still miss the cut score.
Exam Format and Fee Mechanics That Affect Your Outcome
Logistics don't change how hard the questions are, but they do affect how you perform on test day and what a failed attempt costs you.
Closed-book, device-free testing
The exam is closed-book and electronic devices are prohibited. That means no phone-based pressure-temperature charts, no calculator apps, and no quick lookups. Anything you normally check on a gauge manifold app or tablet in the field needs to live in your head for this exam.
Proctored delivery and fees
The current NITC price list (Exhibit #23, Rev 02-12-26) shows $150 for the proctored original STAR Commercial Refrigeration Mastery examination. Candidates who request a Prometric test center face an additional $65 processing fee identified in the commercial application materials. Prometric is an available proctored delivery option for candidates who prefer a formal testing center. Because retake pricing and policies are set by NITC and can change, confirm current terms in the official bulletin and price list before you register. Our STAR certification cost breakdown walks through the full picture, and our STAR exam dates and scheduling guide covers how to book.
Validity and renewal
Certification is valid for 5 years from issuance. Current NITC information says recertification is to be determined, and the 2026 price list shows online recertification as under development at $100. Plan on checking NITC for updates as your renewal window approaches rather than assuming a specific process.
Key Takeaway
Treat your first attempt as the one that counts. With no published pass rate to reassure you and a closed-book, 83% standard, the cheapest path is to prepare thoroughly once rather than treating the first sitting as a practice run. Use a timed mock exam at our STAR practice test site to find your weak categories before you pay the exam fee.
Turning the Missing Data Into a Preparation Plan
Since NITC doesn't tell you how most candidates fare or which categories trip them up, you have to generate your own data. The most reliable method is self-diagnosis against the nine preparation categories, followed by targeted review. This is the one place generic study method is useful, and only because it maps onto STAR specifics.
Diagnose and shore up theory
- Take a full-length practice exam and score yourself by category
- Start with Refrigeration Fundamentals, Refrigeration System Operation, and Basic Electricity, since later topics build on them
Controls and equipment cross-training
- Cover Controls, then Rack Systems, Self-Contained Units, and Ice Machines
- Spend extra time on whichever equipment type you service least
The overlooked categories
- Review Auxiliary Systems and Business and Customer Relations
- Rework every practice question you missed in earlier weeks
Timed simulation
- Sit a closed-book run at the real pace: 194 questions in 2.5 hours
- Aim to clear 161 correct with some cushion before you book the exam
The target to aim for is a practice score comfortably above the 83% line, not merely at it, because real exam wording and question mix will differ from any practice set. The official study guide is the right primary source for scope, though note it is an older revision (Rev. 1.1, 4/22/07), so pair it with the current candidate bulletin. For a full preparation roadmap, see our STAR study guide, and for a quick final review, use the STAR cheat sheet.
Is the credential worth the effort?
Pass-rate anxiety is really a question about risk versus reward. If you are weighing whether the effort pays off, our analyses of whether STAR certification is worth it and the STAR salary guide cover the career side. Employers in commercial refrigeration, including contractors, grocery and food-service service providers, and union-affiliated programs, are the natural audience for this credential. You can test your readiness any time with practice questions at starcommercialexam.com.
Frequently Asked Questions
NITC does not publicly disclose a pass rate for this exam. The candidate bulletin, price list, and official study guide contain no outcome statistics, so any specific percentage you see quoted is unverified.
The passing score is 83%, which the candidate bulletin states as 161 correct answers. The exam has 194 multiple-choice questions, so you can miss no more than 33.
You have 2.5 hours. The exam is closed-book, and electronic devices are prohibited. Prometric test-center delivery is available as a proctored option.
The current NITC price list shows $150 for the proctored original STAR Commercial Refrigeration Mastery examination. Candidates requesting a Prometric center face an additional $65 processing fee per the commercial application materials. Always confirm against the latest NITC documents.
No. The nine headings come from the official UA STAR Commercial Refrigeration Study Guide as preparation categories. NITC does not publish percentage weights for them, and the candidate bulletin's commercial-refrigeration section is the authoritative statement of exam scope.
The absence of a published pass rate is itself useful information: it tells you not to rely on anyone's claimed statistics and to build your own evidence through category-by-category practice. Combine the verified exam structure, an honest self-assessment across all nine preparation areas, and timed closed-book practice, and you will know your readiness far better than any pass-rate figure could tell you.