- Confirm You're Studying the Right Exam
- The Exam at a Glance
- The Eight Published Topic Lines
- Combustion Fundamentals to Memorize
- Building Pressure and Draft Facts
- Carbon Monoxide: The Safety Core
- Prices, Prerequisites and Delivery Mechanics
- What Hasn't Been Verified
- A Domain-Ordered Review Sequence
- Frequently Asked Questions
- The exam is the ESCO Group Professional Level written Combustion Analysis test, delivered through HVAC Excellence: 100 questions, closed book.
- You need at least two years of verified field experience plus the Principles of Electrical and Refrigeration Theory CORE exam first.
- Catalog price labels are Retail $130, Online Exam $40 and Paper Exam $50, and they are not interchangeable totals.
- Eight published topic lines cover combustion, carbon monoxide, building pressure and combustion gas, with no official weighting published.
Confirm You're Studying the Right Exam
Before memorizing anything, make sure the credential matches your goal. This cheat sheet covers Combustion Analysis Certification at the Professional Level, written, offered by ESCO Group and administered through HVAC Excellence. It is not the separate Employment Ready Carbon Monoxide & Combustion Analysis examination, and it is not a Master Specialist hands-on assessment. Those are different products with different formats.
If you're still orienting yourself, the overview in What Is Combustion Analysis Certification? explains the credential's place in the HVAC technician pathway, and Combustion Analysis Requirements 2026: Eligibility, Prerequisites & How to Qualify expands on who may sit for it.
The Exam at a Glance
Here is the one-glance reference for the verified facts. Anything not in this table was not confirmed from the issuer sources reviewed.
| Item | Verified Fact |
|---|---|
| Certifying body | ESCO Group, administered through HVAC Excellence |
| Exam scope | Professional Level, written Combustion Analysis |
| Question count | 100 questions |
| Format | Closed-book, multiple-choice written examination |
| Experience requirement | At least two years of verified field experience |
| Prerequisite exam | Principles of Electrical and Refrigeration Theory CORE exam |
| Credential awarded | Certificate of Achievement |
| Delivery | Proctored online or paper, through an approved proctor |
| Catalog price labels | Retail $130 USD; Online Exam $40 USD; Paper Exam $50 USD |
| Timer, passing score, renewal | Not verified from issuer sources reviewed |
The multiple-choice format is described in ESCO's exam development and test validation process. Expect scenario-style technician questions rather than essay responses, which means you must recognize correct readings, safe conditions and proper next steps quickly.
The Eight Published Topic Lines
The September 2026 HVAC Excellence catalog (page 12) summarizes the examination using eight topic phrases. They are unweighted: no official percentages are published, so don't assume equal or unequal shares. Here they are exactly as the catalog frames them:
- Combustion theory and heating fuels
- Carbon monoxide safety
- Building pressure measurements
- Building pressure general knowledge
- Combustion gas
- Combustion general knowledge
- Carbon monoxide general knowledge
- Carbon monoxide
Two things worth noticing. First, carbon monoxide appears three separate times, which signals how much the exam cares about it. Second, the current Professional webpage compresses the description into five groups, merging building pressure measurements with general knowledge and combustion gas with general knowledge. The catalog's detailed wording keeps all eight lines, so this guide does too. For a deeper walk-through of each area, see Combustion Analysis Exam Domains 2026: Complete Guide to All 8 Content Areas.
Combustion Fundamentals to Memorize
The first and sixth topic lines (combustion theory and heating fuels; combustion general knowledge) are where theory lives. ESCO's supporting manual, Combustion Analysis & Fuel Efficiency by Erik Rasmussen, organizes the underlying material into chapters that make a useful checklist. The public sample lists these chapter titles: The Fuels of Combustion; Combustion; Time - Temperature - Turbulence; Combustion Testing; Testing, Adjustment and Verification; Draft; Stack Temperature & Efficiency; and Carbon Monoxide Safety. These are supporting curriculum chapters, not additional official exam domains.
Combustion Theory and Heating Fuels
Know what has to be present for combustion to occur cleanly and how different heating fuels behave.
- The "three Ts" of complete combustion: time, temperature and turbulence
- How fuel type affects burner behavior and what a technician expects from the flue products
- The difference between complete and incomplete combustion and what each produces
- Why proper air supply matters to both efficiency and safety
Combustion Gas
Flue gas analysis is the diagnostic heart of the discipline.
- What a combustion analyzer measures and how to read the results
- How stack temperature relates to efficiency and why a reading that's off signals a problem
- Using test results to decide whether to adjust, repair or shut down equipment
- The sequence of testing, adjustment and verification: you confirm after you change
A practical approach: for every fuel and appliance concept, ask yourself what the analyzer would show if it went wrong. Exam questions in this area tend to present a set of readings or symptoms and ask for the most likely cause or the correct next action. Pair this with the structured plan in the Combustion Analysis Study Guide 2026: How to Pass on Your First Attempt.
Building Pressure and Draft Facts
Two of the eight topic lines, building pressure measurements and building pressure general knowledge, address an area newer technicians often under-prepare. The idea is that a building is a system, and exhaust fans, duct leakage and tight construction can change the pressure around a combustion appliance enough to disrupt venting.
Building Pressure Measurements and General Knowledge
Understand how pressure relationships inside a structure affect appliance venting and safety.
- How to measure pressure differences between spaces and the outdoors
- How operating other equipment can pull combustion products back into the living space
- How draft interacts with building pressure to determine whether flue gases leave the building as intended
- Why a combustion appliance that tests fine in isolation can still misbehave once the building is running
Draft also appears as a chapter in the supporting manual, so treat draft as a connective topic: it links combustion testing to building pressure. Candidates who understand that link find the pressure questions far more intuitive than those who memorize numbers in isolation. If you're unsure how demanding this material is, How Hard Is the Combustion Analysis Exam? Complete Difficulty Guide 2026 discusses where candidates typically struggle.
Carbon Monoxide: The Safety Core
With three separate topic lines (carbon monoxide safety, carbon monoxide general knowledge and carbon monoxide), this is the single most repeated theme on the published list. The supporting manual closes with a Carbon Monoxide Safety chapter, reinforcing that safety is the endpoint of everything else you study.
Carbon Monoxide Safety, General Knowledge and Testing
Be able to explain how CO is produced, how it's detected and what to do when it's found.
- The link between incomplete combustion and CO production
- Where CO can accumulate and how building conditions contribute
- Safe response steps when an elevated reading is found on a job
- Why verification after any adjustment is a safety step, not a formality
Key Takeaway
Treat every combustion concept as a CO question in disguise. If you can trace a fault from cause (poor air, poor draft, pressure imbalance) to its effect on CO and then to the correct safe action, you've covered a large share of what this exam rewards.
Prices, Prerequisites and Delivery Mechanics
The catalog's page 12 labels three Professional examination prices: Retail $130 USD, Online Exam $40 USD and Paper Exam $50 USD. These are distinct catalog price labels. They are not member versus nonmember fees, and they should not be added together or treated as an all-inclusive candidate total. Your actual out-of-pocket cost depends on the route you choose and on separate costs, namely the prerequisite CORE exam and any preparation materials such as the Rasmussen manual. For a fuller breakdown, see Combustion Analysis Certification Cost 2026: Complete Pricing Breakdown.
On the prerequisite side, you need:
- At least two years of verified field experience
- The separate Principles of Electrical and Refrigeration Theory CORE examination
Delivery is proctored, either online or on paper, as described in the catalog's testing-options section (page 4). Arrange your selected route through an approved proctor rather than assuming you can test on demand. Timing questions are covered in Combustion Analysis Exam Dates 2026: Testing Windows, Deadlines & Scheduling.
| Cost Item | What to Know |
|---|---|
| Retail $130 USD | A catalog price label for the Professional exam; not a guaranteed all-in total |
| Online Exam $40 USD | A separate catalog label tied to the online route |
| Paper Exam $50 USD | A separate catalog label tied to the paper route |
| CORE prerequisite | Separate exam with its own cost; budget for it independently |
| Preparation materials | Optional manual and practice resources are additional |
What Hasn't Been Verified
Honest exam prep means knowing the limits of public information. From the issuer sources reviewed, the following were not verified for the Professional Combustion Analysis exam:
- A published timer or time limit
- A passing threshold or cut score
- A renewal rule
- A detailed blueprint with domain percentages
The HVAC Excellence Competency and Task List workbook is linked from the Professional page, but its contents could not be retrieved, so no unseen objectives or percentages have been reconstructed here. If you see a site quoting exact domain weights or a precise cut score, ask for the source. Our own coverage of these gaps is in Combustion Analysis Passing Score 2026: Exactly What You Need to Pass and Combustion Analysis Pass Rate 2026: What the Data Shows. Confirm timing and scoring details directly with your proctor or HVAC Excellence before test day.
A Domain-Ordered Review Sequence
If you want a short plan, order your review so each stage supports the next. This sequence follows the logic of the subject rather than the catalog's list order.
Combustion theory and fuels
- Master time, temperature and turbulence and complete versus incomplete combustion
- Review heating fuel characteristics before anything else depends on them
Combustion gas and testing
- Practice interpreting analyzer readings and stack temperature
- Rehearse the test, adjust, verify sequence
Building pressure and draft
- Work through pressure measurement and how draft is affected by the building
- Connect pressure problems to venting failures
Carbon monoxide, then full review
- Cover all three carbon monoxide topic lines and safe-response decisions
- Finish with closed-book timed practice across all eight lines
Doing combustion theory first matters because the pressure and carbon monoxide material assumes you already understand how and why combustion goes wrong. When you're ready to test yourself under exam-like conditions, use the Combustion Analysis practice tests and check the full question bank for domain-by-domain drills.
Frequently Asked Questions
The exam-specific Professional table and the September 2026 catalog support 100 questions, closed book, in multiple-choice format. An older, undated ESCO training page describes 50-question tests, but the current exam-specific sources take priority.
At least two years of verified field experience and the separate Principles of Electrical and Refrigeration Theory CORE examination. See the full requirements guide for details on qualifying.
No weighting is published. The eight lines come from the catalog's examination description and are unweighted topic phrases, not an official allocation. Prepare across all of them, with extra emphasis on carbon monoxide, which appears three times.
The catalog labels Retail $130 USD, Online Exam $40 USD and Paper Exam $50 USD. These are distinct price labels rather than a single all-inclusive total, and the CORE prerequisite and study materials are separate costs. The cost breakdown explains how to budget.
That depends on your role and employer expectations. For a balanced look at earning potential and career value without inflated claims, read Is the Combustion Analysis Certification Worth It? Complete ROI Analysis 2026 and the Combustion Analysis Salary Guide 2026.