OH-REF Passing Score 2026: Exactly What You Need to Pass

The Passing Score, Stated Plainly

If you're prepping for the Ohio Refrigeration Contractor License Exam, the number that matters most is 70%. That's the passing requirement PSI applies to both the trade examination and the separately administered Contractor's Business and Law examination. But "70%" is an abstraction until you translate it into raw questions - and the translation differs slightly between the two exams because they're built on different question counts.

On the refrigeration trade exam, you're scored on 60 questions. Seventy percent of 60 is 42. That means you need 42 correct answers out of 60 scored items to pass. The exam actually delivers 70 questions total during your 3-hour session, but 10 of those are unscored pretest questions PSI uses to evaluate future exam content. You won't know which ones are pretest items, so every question deserves your full attention - but only 60 of them count toward your 42-correct target.

For a deeper walkthrough of what's actually tested inside those 60 questions, the OH-REF Exam Domains 2026: Complete Guide to All 5 Content Areas breaks down each content area topic by topic.

How PSI Scores the Trade Exam

The trade examination is computer-based and open-book, administered through PSI testing centers under Ohio Construction Industry Licensing Board (OCILB) oversight. Because it's open-book, the passing bar isn't about memorizing code text verbatim - it's about knowing where to find the right answer fast enough to work through 60 scored questions plus 10 pretest questions inside a 3-hour limit. That's an average of exactly 3 minutes per question if you used all 180 minutes evenly, though most candidates move faster on straightforward general-knowledge items and slow down on calculation-heavy piping or systems questions.

Scoring itself is straightforward: each of the 60 scored questions is worth the same weight, and there's no partial credit or penalty for wrong answers versus blanks. A candidate who answers all 70 questions and gets exactly 42 of the 60 scored ones correct passes with no margin to spare. A candidate who leaves questions blank because they run out of time is treated the same as one who answers incorrectly - so pacing across your 3-hour session matters as much as raw content knowledge.

Domain Weighting and What It Means for Your Target Score

The 60 scored questions aren't distributed evenly across the five content domains. Here's the official allocation:

This weighting matters directly for how you approach the 42-correct target. Domain 1 (General Knowledge & Requirements) and Domain 4 (Refrigeration Systems & Controls) together account for 33 of the 60 scored questions - well over half the exam. If your goal is to comfortably clear 70%, these two domains deserve proportionally more study time than Domain 3 (Refrigerants), which carries only 6 scored questions.

That doesn't mean you can ignore Refrigerants - missing all 6 of those questions still puts you at 54 correct out of the remaining 54 possible, which is mathematically impossible to reach 42 if you're also weak elsewhere. Every domain contributes to your final tally, but a study plan that ignores the weighting is a study plan that wastes hours on low-yield material. The OH-REF Study Guide 2026: How to Pass on Your First Attempt walks through how to sequence your review around this exact distribution.

The Business and Law Exam Has Its Own 70%

Passing the trade exam is only half the licensing requirement. Ohio also requires a separate Contractor's Business and Law examination, and it has its own independent 70% passing threshold. This exam covers 50 scored questions plus 5 unscored pretest questions, for 55 total, administered in a 2-hour window.

Run the same math: 70% of 50 scored questions is 35. So you need 35 correct out of 50 scored questions to pass Business and Law - a different target number than the trade exam's 42-of-60, and easy to confuse if you're studying both at once.

For the full fee structure across both exams plus application and licensing costs, see the OH-REF Certification Cost 2026: Complete Pricing Breakdown.

What Happens If You Miss the Cut

Falling short of 42 correct on the trade exam, or 35 correct on Business and Law, means you didn't pass that portion. Ohio's retesting rule requires a 60-day wait before you can retest a failed portion, and PSI permits up to five retests in a year. Each retest costs $69, charged per examination, so a failed attempt is both a time delay and a real out-of-pocket cost.

This is exactly why understanding the domain weighting before your first attempt pays off. A candidate who walks in without knowing that Domain 1 alone represents 18 of 60 points, or that Refrigerants only carries 6, is more likely to misallocate study time and land just under 42. For a realistic sense of how challenging the exam tends to be for candidates overall, read How Hard Is the OH-REF Exam? Complete Difficulty Guide 2026 and OH-REF Pass Rate 2026: What the Data Shows.

References, Highlighting, and the Onscreen Calculator

Because the trade exam is open-book, your score depends partly on how efficiently you navigate approved references during the 3-hour session. Per the PSI bulletin updated February 7, 2024, approved references include the 2024 Ohio Mechanical Code and Modern Refrigeration and Air Conditioning, 22nd edition. You're allowed to bring these with advance highlighting, underlining, and indexing already in place - tab your code book and refrigeration text before exam day so you're not flipping blindly under time pressure.

What's prohibited: handwritten notes and additional loose papers. If PSI proctors find notes beyond publisher-printed text with your highlighting and index tabs, those materials can be disallowed on the spot. The only calculator permitted is PSI's built-in onscreen calculator - outside calculators, including your phone or a physical calculator, are not allowed.

Where to Put Your Study Hours by Domain

Given the 42-of-60 target and the domain weighting above, a study plan built around point value - not alphabetical order or textbook chapter order - gets you to 70% faster. Here's a sample allocation over a multi-week runway, scaled to each domain's scored-question share.

This isn't a rigid template - spaced repetition and timed practice runs (whatever technique fits your schedule) still apply - but the order should follow point value, spending the most hours where the most scored questions live. The OH-REF Cheat Sheet 2026: One-Page Review of Must-Know Facts is useful for a final-week consolidation pass across all five domains.

After You Clear 70%: Fees and Renewal

Passing both the trade exam and Business and Law exam is only the testing portion of licensure. Eligibility to sit for the exams in the first place requires being 18 or older, U.S. citizenship or lawful status, and five years of documented trade experience immediately preceding your application - or qualifying alternatives such as holding an Ohio professional engineer license with three years of trade construction-business experience, or five years as an Ohio governmental trade inspector. Applicants also complete BCI/FBI background checks alongside experience documentation. Full detail on these paths is in OH-REF Requirements 2026: Eligibility, Prerequisites & How to Qualify.

Once you've passed, the application fee is $25 and initial license issuance is another $25. Active contractors must maintain at least $500,000 of liability insurance. Standard annual renewal costs $60 and requires 10 continuing-education hours. Licensees admitted to the Compliant Contractor Program after a qualifying year can instead complete 8 hours annually or 24 hours for a $180 three-year renewal - a meaningfully different rhythm worth planning around once you're a few renewal cycles in.

Before you get to that stage, though, everything hinges on clearing 42 of 60 and 35 of 50. Run full-length timed sessions on the OH-REF practice test platform so the 70% target stops feeling abstract and starts feeling like a number you already hit consistently in practice.

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