AC & Heat Pump Professional Passing Score 2026: Exactly What You Need to Pass

The Passing Score, In Plain Numbers

The AC & Heat Pump Professional credential from Building Performance Institute, Inc. (BPI) is a two-part test: an online multiple-choice exam and a separate field examination. Both have to be passed, and they're graded differently. This matters because a lot of candidates assume "70% passing" means the same thing everywhere in the process - it doesn't. The online exam has one clean cutoff. The field exam has a cutoff plus two section-specific floors that can trip up an otherwise strong performance.

Per the Core Certification Scheme Handbook (revised April 9, 2026), the requirements break down like this:

• Online exam: 70% overall to pass.
• Field exam: 70% overall and a minimum of 85% on the CAZ (Combustion Appliance Zone) section and 85% on the CO (Carbon Monoxide) section.

That second bullet is the one that surprises people. You could score 78% overall on the field exam and still fail it if you drop below 85% on CAZ or CO - because those two sections carry a hard floor tied to occupant safety, not just an average. If you want the full breakdown of what's tested inside those sections and the rest of the exam content, the AC & Heat Pump Professional Exam Domains 2026: Complete Guide to All 6 Content Areas article maps every domain to the task list BPI publishes.

Online Exam Format and What 70% Actually Means

New candidates sit for 100 multiple-choice questions in a two-hour online session administered at a BPI Test Center. The exam is closed book, with one exception: BPI Standards are made available directly through the testing platform, so you're not memorizing standard language word-for-word - you're expected to know how to apply it under time pressure.

If you already hold a BPI Core certification, your online pathway is shorter: 50 questions in 90 minutes. The passing bar is identical - 70% - but the shorter format means each question carries proportionally more weight, so there's less room to absorb a run of guesses on unfamiliar material.

In raw terms, 70% on the 100-question version means you need roughly 70 correct answers. On the 50-question version for Core holders, that's roughly 35 correct answers. Neither exam publishes a curve or scaled score adjustment in the handbook, so treat 70% as a firm, non-negotiable line rather than a target with buffer built in.

Field Exam: The 70/85 Rule

The field examination runs a separate two hours and is open book - but "open book" doesn't mean open help. You can reference your own materials and BPI Standards, but you cannot get assistance from another person during the assessment. This is a hands-on, applied test of whether you can actually diagnose and verify system performance on real equipment, not just recognize correct answers on a screen.

Passing requires clearing three separate thresholds simultaneously:

• 70% or higher on the field exam as a whole
• 85% or higher specifically on the CAZ section
• 85% or higher specifically on the CO section

Because EPA Section 608 Type II or Universal certification is a prerequisite for the AC & Heat Pump Professional credential itself, most candidates arrive with baseline refrigerant-handling knowledge already. The field exam builds on that by testing whether you can verify charge, measure airflow correctly, and read combustion safety indicators in a live or simulated field setting - not just recite EPA rules.

Domain Weights on the Online Exam

The online exam's 100 (or 50) questions aren't distributed evenly across content. Some domains carry far more weight than others, and knowing that distribution changes how you allocate study time. These weights come directly from the April 9, 2026 Core Certification Scheme Handbook:

Notice that Domains 3, 4, and 5 together make up 65% of the online exam. If your 70% target has to come from somewhere, it has to come primarily from these three areas - measurement and verification, standards and specifications, and optimization. Domain 6 (Health & Safety) is only 5% on the online exam, but don't mistake that for low priority overall: it resurfaces heavily on the field exam's CAZ and CO thresholds, where it's the difference between passing and failing regardless of your online score.

For a domain-by-domain breakdown of specific task list items under each of these six areas, see the AC & Heat Pump Professional Exam Domains 2026 guide, and pair it with the AC & Heat Pump Professional Cheat Sheet for a condensed final-review pass.

Field Exam Weighting: Systems, Measurement, Optimization

The field exam uses a different weighting structure than the online exam - this is a separate scheme entirely, not a subset of the six online domains:

Optimization carries the most weight on the field exam (40%), which lines up with what you'd expect from a hands-on assessment: BPI wants to see that you can actually improve a system's installation, operation, and maintenance in front of an evaluator, not just describe the theory. Systems Interaction at 35% reflects the reality that AC and heat pump work rarely happens in isolation from ductwork, envelope, and combustion systems.

Layer the 70%-plus-85%-on-CAZ/CO rule on top of this weighting and the strategic picture becomes clear: you need broad competence across all three field areas, with airtight execution specifically on combustion safety procedures, because that's the one area with a hard floor instead of an averaged score.

The 12-Month Clock

Passing scores only count within a window. Once you sit for your first examination (online or field, whichever comes first), you have 12 months to complete the entire certification - meaning both the online exam and the field exam need to be passed within that period. If you pass the online exam at 82% in month one but don't schedule and pass the field exam until month 14, your online result no longer applies and you'll need to retake it.

This timeline consideration should shape how you schedule your two exams relative to each other. Candidates who space them too far apart risk losing ground on retained knowledge, particularly on Domain 3 (Measurement and Verification) content that overlaps heavily with the field exam's measurement component.

For a look at how BPI Test Centers structure availability throughout the year and how to plan your 12-month window around it, check the AC & Heat Pump Professional Exam Dates 2026 guide.

How the Passing Score Follows You Into Renewal

Certification is valid for three years, and the passing-score logic reappears at renewal time in a modified form. You have two waiver paths:

• Online exam waiver: Complete 30 relevant CEUs during the certification period, and you don't have to retake the 70%-threshold online exam.
• Field exam waiver: Log 3,000 verified relevant work hours during the preceding three years, and you can waive the field exam - but this option is only available for your first or second renewal, not indefinitely.

If you waive the field exam, the renewal application fee is $360. If the online exam is still required (because you didn't hit the CEU threshold), an additional online exam fee applies on top of that - this is separate from the initial certification exam fee structure and shouldn't be confused with it. For the complete fee picture across initial certification and renewal, see the AC & Heat Pump Professional Certification Cost 2026 breakdown.

The practical takeaway: the 70% (and 70/85%) passing bar you clear today isn't a one-time hurdle. Unless you accumulate CEUs and work hours strategically, you may face the same scoring requirements again at renewal three years out.

Turning Score Targets Into a Study Plan

Knowing the exact numbers - 70% online, 70% plus 85%/85% on the field exam - should directly shape how you allocate preparation time rather than sitting as trivia. A reasonable structure, built around the domain weights above, looks like this:

Use the domain and field weight tables above as a checklist, not just a reference - every hour spent on a 5%-weighted topic is an hour not spent on a 25%-weighted one. If you want a fuller walk-through of pacing, question style, and common traps by domain, the AC & Heat Pump Professional Study Guide 2026 goes deeper on technique, and running timed practice sets on our practice test platform is the most direct way to see whether you're actually clearing 70% under exam-length time pressure rather than just recognizing answers in a relaxed review session.

If you're still deciding whether the credential fits your career path before you commit study hours to hitting these thresholds, the Is the AC & Heat Pump Professional Certification Worth It? analysis and the How Hard Is the AC & Heat Pump Professional Exam? difficulty guide are worth reading before exam day, not after.

FAQ