- ACAC does not publish a CETC pass rate; any specific percentage you see online is unverified.
- The passing threshold is at least 75%, verified in the current Official CETC Application.
- ACAC's December 31, 2025 report lists 10 current CETC certifications, which is a holder count, not exam volume.
- Eligibility screening, four project sheets and unanimous board approval filter candidates before they ever sit the exam.
Why There Is No Published Pass Rate
If you searched for the CETC pass rate hoping to find a clean percentage, here is the honest answer: the American Council for Accredited Certification (ACAC), which administers the Council-certified Environmental Thermography Consultant credential, does not publish one. We checked the ACAC Environmental Thermography page, the candidate handbook, the application process page, the Official CETC Application, the eligibility FAQ, the exam administration page, the fees page and the recertification procedures. None of them states how many candidates attempt the exam or what share pass.
That matters because pass-rate articles for popular certifications often recycle a single unsourced figure until it looks authoritative. We will not do that here. This article walks through what the available evidence supports, where candidates realistically fall out of the process, and how to prepare so that the unknown pass rate becomes irrelevant to your own result. For the broader difficulty picture, see our companion piece, How Hard Is the CETC Exam? Complete Difficulty Guide 2026.
What the Available Data Does Say
The one hard number ACAC provides about this credential is in its Accredited Certification Activity Report for the period ending December 31, 2025: 10 current CETC certifications. Read that carefully. It is a count of people who currently hold the credential. It is not the number of people who sat the exam, and it cannot be divided into anything to produce a pass rate, because we do not know how many applied, withdrew, failed or were never approved.
What the figure does tell you is useful context:
- This is a small, specialized credential. A holder pool this size means the community is tight-knit and the credential is a niche differentiator rather than a mass-market badge.
- Candidate-reported anecdotes are thin. With so few holders, there is little crowd-sourced evidence about difficulty, and you should be skeptical of confident-sounding forum claims.
- The credential is CESB-accredited. The accreditation signals that the exam and certification process meet recognized standards for certification bodies, which generally means the exam is psychometrically managed rather than informal.
For a sense of what the credential is and who it serves, our explainers What Is CETC Certification? and What Does CETC Stand For? cover the fundamentals.
Where Candidates Actually Drop Out
With most credentials, the exam is the main hurdle. For the CETC, a lot of the filtering happens earlier, through the application itself. That is why a raw "exam pass rate" would be a misleading measure of how selective the credential really is.
Stage 1: Eligibility
ACAC requires eight combined years of relevant science-related postsecondary education and field experience, subject to its education-credit assessment. Even if your degree credits are generous, the eligibility FAQ requires at least one actual year of field experience. A strong academic record alone will not get you through. The full breakdown is in CETC Requirements 2026: Eligibility, Prerequisites & How to Qualify.
Stage 2: Documentation
You must provide transcripts when claiming education, plus verifiable investigation reports or contracts for relevant investigations, consulting or report writing. You also submit four separate project sheets, the online application and email verifications. Candidates who cannot produce verifiable work samples stall here.
Stage 3: The Exam
Only then do you sit a closed-book, computer-delivered multiple-choice exam through Kryterion, either at a test center or by secure online video proctoring.
Stage 4: Board Approval
Certification requires unanimous board approval. Passing the exam is necessary but not by itself sufficient.
The 75% Threshold and Exam Format
The passing threshold is at least 75%, verified in the current Official CETC Application. ACAC does not publish a scaled-score conversion in the materials we reviewed, so plan on the plain reading: you need roughly three of every four items correct. For a deeper treatment, see CETC Passing Score 2026: Exactly What You Need to Pass.
ACAC's general examination policy describes the format:
| Feature | What ACAC Specifies |
|---|---|
| Question type | Multiple choice with at least four answer choices |
| Book policy | Closed-book |
| Delivery | Computer-delivered |
| Testing provider | Kryterion |
| Location options | Test center or secure online video proctoring |
| Passing threshold | At least 75% |
Two implications follow. First, closed-book means you cannot lean on a reference table for emissivity values or camera specifications; recall must be solid. Second, a 75% bar leaves limited room to skip a content area. If one of the four competency areas is weak, it can drag you under the line even when the others are strong.
One caution: ACAC lists the four competency headings below as the application competencies, not as an exhaustive exam blueprint or an official total domain count, and the headings carry no published weights. The linked candidate handbook page contained no syllabus text. Treat the scope below as the best available guide until ACAC supplies a complete blueprint.
Domain Readiness: What to Master
Because the exam is unweighted as far as published materials show, balanced readiness beats specialization. The four competency areas are roof inspections, building exterior investigations, building interior investigations and plumbing investigations. ACAC's materials also describe thermal and infrared physics, along with infrared-camera selection, calibration and operation, as part of the competency scope. For the full walk-through, read CETC Exam Domains 2026: Complete Guide to All 4 Content Areas.
Domain 1: Roof inspections
Roofs are where thermography meets weather exposure. Expect to reason about how thermal patterns relate to moisture, materials and conditions at the roof surface.
- How roof assemblies behave thermally across a heating and cooling cycle
- Distinguishing moisture-related thermal patterns from construction features
- Conditions that make a roof survey valid or unreliable
Domain 2: Building exterior investigations
Exterior scans deal with the building envelope as seen from outside, where sun, wind and surface properties can mislead an inexperienced operator.
- Interpreting envelope anomalies versus normal thermal variation
- Environmental influences on exterior imagery
- Documenting findings so they can be verified by others
Domain 3: Building interior investigations
Interior work is about finding concealed conditions without opening walls, and about separating real anomalies from the patterns that heating, ventilation and finishes create.
- Reading interior surface patterns in context
- Corroborating thermal findings rather than trusting a single image
- Understanding how interior conditions affect imaging quality
Domain 4: Plumbing investigations
Plumbing thermography targets concealed leaks and system behavior, where temperature differences between water and surrounding materials are the key signal.
- Thermal signatures associated with concealed water and supply lines
- Limits of detection and when confirmation is needed
- Reporting findings to clients and other trades
Fees, Retakes and the Cost of a Miss
Since there is no published pass rate, the practical way to think about risk is cost. Here is the fee structure from ACAC's official materials:
| Item | Amount (USD) |
|---|---|
| Examination fee | $100 |
| Certification fee | $400 |
| Initial total, US/Canada applicants | $500 |
| Initial total, outside US/Canada (per the official application) | $525 |
| Retake | $100 |
| Renewal | $400 |
A failed attempt costs you the $100 retake fee plus time. That is modest relative to the $500 total, but remember the six-month completion window: a retake consumes calendar time as well as money. If you fail late in the window, you may not have room to try again before the application lapses. Our CETC Certification Cost 2026: Complete Pricing Breakdown covers the full financial picture.
Renewal and the Discrepancy You Should Verify
Certification is valid for two years. The central renewal procedure requires 40 recertification credits (RCs): 10 for continued field activity and 30 hours of professional development. However, the credential page instead describes 20 professional-development hours annually. These do not obviously match, so confirm the current requirement directly with ACAC when planning renewal rather than assuming either version.
Key Takeaway
Treat the exam as one step in a longer pipeline. Budget for the $500 initial total (or $525 outside the US/Canada), keep $100 in reserve for a possible retake, and plan the renewal cycle before you certify so the ongoing cost and credit requirements are not a surprise.
A CETC-Specific Prep Sequence
Because the exam is closed-book and the 75% bar leaves little slack, sequence your preparation around the content rather than around generic study habits. The order below puts the physics first because it supports everything else, and saves plumbing for the end because it benefits from the pattern-recognition you build earlier.
Infrared physics and camera fundamentals
- Review thermal and infrared principles until you can explain them without notes
- Work through camera selection, calibration and operation concepts
- Why first: every later domain assumes this foundation
Roof inspections and building exterior investigations
- Study the two outdoor-exposed domains together, since environmental influences overlap
- Practice distinguishing real anomalies from sun, wind and surface artifacts
Building interior investigations
- Focus on corroboration and context when interpreting interior patterns
- Review how finishes and conditioning systems create misleading images
Plumbing investigations and full-length review
- Cover plumbing signatures and the limits of detection
- Take timed, closed-book practice sets across all four areas and revisit your weakest one
For a fuller plan, see the CETC Study Guide 2026: How to Pass on Your First Attempt and the quick-reference CETC Cheat Sheet 2026: One-Page Review of Must-Know Facts. When you are ready to test yourself under realistic conditions, start with the CETC practice test, which mirrors the closed-book multiple-choice style.
Note that ACAC lists no mandatory training course, so preparation is largely self-directed. Your real-world field experience and the investigation reports you assemble for the application are themselves a form of preparation, which is one reason the experience requirements exist. If you are weighing formal options, CETC Training outlines how candidates approach it.
How to Read Pass-Rate Claims Critically
Even without an official figure, you will encounter confident numbers online. Here is how to evaluate them.
- Ask for the source. A legitimate pass rate comes from the certifying body or testing provider. If a site cannot point to an ACAC or Kryterion document, treat the number as unverified.
- Check which CETC it describes. Several unrelated credentials share this acronym. A percentage attached to a different CETC says nothing about the Council-certified Environmental Thermography Consultant exam.
- Distinguish holders from candidates. The 10 current certifications in ACAC's 2025 report count people who hold the credential today. It does not reveal how many tried and failed.
- Remember the funnel. Because eligibility, documentation and board approval all precede or follow the exam, a pass rate for the exam alone would understate how selective the whole process is.
- Weight your own readiness more heavily. With a 75% threshold and a closed-book format, your score on well-built practice sets is a far better predictor than any population statistic.
If you are still deciding whether to pursue the credential at all, our analyses in Is the CETC Certification Worth It? Complete ROI Analysis 2026 and CETC Jobs look at the career side, and you can compare earnings context in the CETC Salary Guide 2026: Complete Earnings Analysis.
Frequently Asked Questions
ACAC does not publish a pass rate for the Council-certified Environmental Thermography Consultant exam. Its December 31, 2025 activity report lists 10 current CETC certifications, but that is a holder count, not exam volume, so no pass rate can be derived from it. Treat any specific percentage online as unverified.
The passing threshold is at least 75%, verified in the current Official CETC Application. The exam is closed-book, computer-delivered multiple choice with at least four answer choices per question, delivered through Kryterion at a test center or by secure online video proctoring.
A retake costs $100. Keep in mind that the entire application process, including the examination, must be completed within six months, so a failed attempt late in that window may leave little time to retest. Plan your scheduling with that deadline in mind.
No. Certification also requires meeting the eligibility standard, submitting four separate project sheets, supplying verifiable investigation reports or contracts and email verifications, and receiving unanimous board approval. The exam is one stage in a multi-step process.
For US/Canada applicants the initial total is $500, made up of a $100 examination fee and a $400 certification fee. The official application lists $525 for applicants outside the US/Canada. Retakes are $100 and renewal is $400.
Want to gauge your readiness against the closed-book multiple-choice format? Try a set of questions on our main practice test site and see which of the four competency areas needs the most work.