NV-C21 Pass Rate 2026: What the Data Shows

Does Nevada Publish an Official C-21 Pass Rate?

If you're searching for a headline number - "X% of candidates pass the Nevada C-21 exam" - you won't find one from an official source. The Nevada State Contractors Board and PSI Services LLC, which administers the computer-based test, do not release aggregate pass/fail statistics for the C-21 Refrigeration and Air Conditioning trade exam. That's a meaningful distinction from how some other trade exams get discussed online, and it's worth stating plainly so you don't build a study plan around a number nobody has actually confirmed.

What Nevada does publish is far more useful for your preparation: the exact question count, time limit, passing threshold, allowed references, and the full domain outline that determines how those 85 questions are distributed. That structural data is a better predictor of your personal pass likelihood than any borrowed statistic, because it tells you exactly where the exam concentrates its questions and what you need to know cold before test day.

The Passing Score Mechanics That Actually Matter

The C-21 trade exam consists of 85 questions delivered over 180 minutes, and you need a minimum of 60 correct answers to pass. That works out to roughly 70.6% of the scored content - a fixed, published threshold rather than a moving target based on other candidates' performance. PSI may also insert 1 to 10 unscored experimental questions into your session; these count against your time but not against your score, and you have no way of identifying which questions they are.

This structure has a practical implication: because the passing bar is fixed at 60 correct answers, your individual outcome depends entirely on your own preparation against the domain outline - not on how a broader applicant pool performed that testing window. For the full breakdown of exactly how the threshold is calculated and what margin of error it leaves, see NV-C21 Passing Score 2026: Exactly What You Need to Pass.

What Domain Weighting Tells You About Likely Difficulty

Because no pass rate exists, the item allocation across the 22 content domains is the single best proxy for predicting where candidates are most likely to lose points. The official breakdown shows a wide spread - some domains carry as little as one question, while others carry up to ten.

Fuel Systems being the single largest domain at 10 questions - roughly 12% of the entire exam by itself - means gas piping sizing, appliance venting interaction, and fuel-supply code requirements deserve disproportionate study time. Refrigerants and Refrigeration at 7 items is the next-heaviest concentration, reflecting the exam's core identity as a refrigeration and air conditioning trade test rather than a generic HVAC survey.

Six domains - Insulation, Sound/Vibration/Seismic Control, and Machine Room - carry only a single question each. That doesn't mean skip them entirely, since a wrong answer on a one-item domain costs the same as one on a heavier domain, but it does mean your marginal study hour is better spent reviewing Fuel Systems or Refrigerants and Refrigeration than memorizing niche seismic bracing rules. For a domain-by-domain study sequence, the NV-C21 Study Guide 2026 walks through prioritization in more detail.

Retake Rules Shape Your Odds More Than a Headline Number

Without a published pass rate, the retake policy is arguably more informative about how Nevada treats repeated attempts. If you don't pass, you must wait two weeks before scheduling again. That waiting period is short enough to keep momentum but long enough to force a real second look at whatever domains cost you points the first time.

The more consequential rule: three failed attempts voids your application entirely, and you cannot reapply for 30 days after that voiding. This isn't a minor administrative footnote - it means candidates who treat the exam casually on a first or second attempt, assuming they can simply retake it indefinitely, are working against a hard structural limit. Understanding this rule before you sit for the first attempt is part of understanding overall exam difficulty; see How Hard Is the NV-C21 Exam? Complete Difficulty Guide 2026 for how this interacts with the content itself.

Who Is Actually Sitting for the NV-C21 Exam

Pass likelihood is also shaped by who is eligible to test in the first place. Nevada ordinarily requires four years of journeyman, foreman, supervising-employee, or contractor experience within the preceding fifteen years before a candidate becomes eligible for the trade qualifier exam. Approved education can substitute for up to three of those four years, but hands-on field experience remains the backbone of eligibility.

In practice, this means most candidates arrive at the testing center with substantial field time already behind them - they are not entry-level test-takers encountering refrigeration and gas-fuel concepts for the first time. That baseline experience is part of why the exam leans heavily on scenario-based application rather than pure definitional recall. It also means candidates who skipped formal code-book study, relying purely on field habits, often struggle specifically with the code-referenced domains like Fuel Systems and Chimneys, Flues and Vents. Full eligibility mechanics, including the experience-verification and background review steps that precede your eligibility notice, are covered in NV-C21 Requirements 2026: Eligibility, Prerequisites & How to Qualify.

The Open-Book Format's Effect on Outcomes

One structural feature that meaningfully influences outcomes: the NV-C21 trade exam is open book, but only two references are permitted - the 2018 Uniform Mechanical Code and the NFPA 54 National Fuel Gas Code 2012. Candidates may bring copies with pre-highlighting, underlining, and permanent tabs already in place. Handwritten notes, temporary tabs, and any loose inserted material are not allowed. A silent, non-programmable calculator meeting PSI's restrictions is also permitted.

This open-book structure sounds like an advantage, and it is - but only for candidates who have already organized their code books before test day. Given 180 minutes for 85 questions (plus up to 10 unscored items), you have roughly two minutes per question on average, which leaves little room to hunt through an unfamiliar table of contents mid-exam. Candidates who walk in with a well-tabbed code book built around the heaviest domains - Fuel Systems, Refrigerants and Refrigeration, Piping, Load Calculations, and Ducts - consistently manage their time better than those relying on the code book as a last resort.

The Real Cost of an Unsuccessful Attempt

Since no official pass rate exists to quantify risk, it's worth quantifying the financial stakes of an unsuccessful attempt instead. The trade portion alone costs $95 per sitting, or $140 if you're testing the trade exam together with the Construction Management Survey business-and-law package. Add to that the $300 licensing application fee and the eventual $600 biennial license fee once you're approved, and a failed attempt isn't just a two-week delay - it's a direct hit to your total path cost.

These figures, along with how the Construction Management Survey's separate passing standard factors into your overall timeline, are broken out fully in NV-C21 Certification Cost 2026: Complete Pricing Breakdown. Budgeting for one solid attempt rather than several is almost always cheaper and faster than assuming you'll need retakes.

Building a Preparation Timeline Around the Data

Given the domain weighting and the tight two-minutes-per-question pace, a structured multi-week timeline that front-loads the heaviest domains tends to outperform an unstructured review of all 22 areas equally. The goal isn't to spend equal time everywhere - it's to allocate study hours roughly in proportion to item count, then layer in code-book navigation practice using your actual 2018 UMC and NFPA 54 2012 copies.

For a deeper walkthrough of each of these 22 domains individually, review the complete domain guide, and pair your studying with realistic timed practice through our NV-C21 practice test platform to simulate the actual pacing constraints before test day.

Frequently Asked Questions

For a broader look at whether the time and cost investment pays off relative to the licensing path, see Is the NV-C21 Certification Worth It? Complete ROI Analysis 2026, and browse our full NV-C21 exam prep resources to build a study plan around the domain weighting