- New candidates take 100 online questions in two hours plus a separate two-hour field exam.
- Online passing score is 70%; field passing requires 70% overall and 85%+ on CAZ and CO sections.
- Optimization carries the heaviest field weight at 40%; on the online exam, it's 25%.
- EPA Section 608 Type II or Universal certification is a prerequisite - no specific training course is mandatory.
What the AC & Heat Pump Professional Credential Covers
The AC & Heat Pump Professional certification is administered by the Building Performance Institute (BPI) through BPI Test Centers. It's built for technicians and building performance professionals who diagnose, install, and optimize air conditioning and heat pump systems within the broader context of building science - not just refrigerant lines and compressors, but airflow, envelope interaction, and combustion safety too. If you're still getting oriented to what this credential is and who it's for, the overview of what AC & Heat Pump Professional actually is and the explanation of what the credential means in practice are good starting points before you dive into this cheat sheet.
This page is a condensed, one-stop reference. It won't replace deep study, but it will keep the pathway mechanics, domain weights, and passing thresholds in one place so you're not hunting through PDFs the week before your test date.
Exam Pathways and Format at a Glance
There are two roads into the AC & Heat Pump Professional credential, and which one applies to you depends on whether you already hold a BPI Core certification.
- New-candidate pathway: 100 multiple-choice questions online, completed within two hours, followed by a separate two-hour field examination.
- Existing BPI Core certification holder pathway: A shorter 50-question online exam with a 90-minute limit, plus the same field examination requirement.
Both pathways require the online exam to be passed at 70% or higher. The online portion is closed book, with one exception - BPI Standards are provided directly through the testing platform, so you're allowed to reference those during the test. Everything else is from memory.
Before you register, confirm your EPA credential status. AC & Heat Pump Professional certification requires EPA Section 608 Type II or Universal certification. There's no mandate to complete a specific training course beforehand, which means your prep path can be self-directed - but it also means the burden of coverage is entirely on you. For a full rundown of what you need before you can even sit the exam, see the AC & Heat Pump Professional requirements and eligibility guide.
Key Takeaway
Check your EPA 608 status first. If you don't hold Type II or Universal EPA certification, that's a prerequisite you must resolve before your BPI exam registration is meaningful.
Domain-by-Domain Cheat Sheet
The online exam's six domains carry different weights, and treating them equally in your study plan is a common mistake. Here's the breakdown, condensed for quick review. For deeper explanations of each area, the complete domain-by-domain guide goes further than this summary.
Domain 1: Building Science (15%) - Intermediate
Covers how buildings behave as connected systems: heat transfer, moisture movement, pressure boundaries, and how AC and heat pump equipment fits inside that envelope.
- Understand pressure relationships between conditioned and unconditioned spaces
Domain 2: AC & Heat Pump Systems and their Interaction with other Building Systems (15%) - Intermediate
Focuses on how ductwork, ventilation, combustion appliances, and insulation choices affect - and are affected by - AC and heat pump operation.
- Know how duct leakage or oversizing creates comfort and safety issues elsewhere in the home
Domain 3: Measurement and Verification of Building Performance (20%) - Intermediate/Application
Tests your ability to measure airflow, temperature split, static pressure, and refrigerant charge, then interpret what those numbers mean.
- Practice airflow measurement techniques until they're second nature - this domain rewards application, not memorization
Domain 4: BPI National Standards and Project Specifications (20%) - Intermediate/Application
Requires familiarity with BPI Standards documents themselves - remember, these are the one reference you're allowed during the online exam, so know how to navigate them quickly.
- Practice locating specific standards sections under time pressure before test day
Domain 5: Optimizing the Installation, Operation, and Maintenance of Building Systems (25%) - Fundamentals/Application
The single largest domain on the online exam. Covers best practices for commissioning, maintenance scheduling, and performance tuning across the system lifecycle.
- Study refrigerant charge verification procedures in depth - they show up across both the online and field exams
Domain 6: Health & Safety (5%) - Fundamentals
The smallest online weight, but don't skip it - combustion safety and CO-related knowledge resurface heavily in the field exam.
- Review combustion safety basics even though this domain's online weight is light
Notice that Domain 5 (Optimization) and Domain 3 (Measurement and Verification) together make up 45% of the online exam. If your study time is limited, that's where the highest return sits. For a broader discussion of how tough this exam actually feels in practice, read how hard the AC & Heat Pump Professional exam really is.
Field Exam Weights and Passing Thresholds
The field examination is a completely separate, two-hour, hands-on component with its own weighting structure - distinct from the online domain percentages above.
- Systems interaction: 35%
- Measurement and verification: 25%
- Optimization: 40%
The field exam is open book, but with a critical restriction: you may use reference materials, but you cannot receive assistance from another person during the test. To pass, you need 70% overall and at least 85% on both the CAZ (Combustion Appliance Zone) and CO (carbon monoxide) sections. These two sections function as a gate - score high everywhere else and still fail if CAZ or CO testing falls short of 85%.
You have 12 months from your first examination to complete certification - meaning both online and field components need to be finished within that window. Plan your scheduling accordingly; don't let a passed online exam expire while you delay the field portion. For exact scheduling logistics and how testing windows typically work, check the exam dates and scheduling guide.
Renewal Math You Need to Remember
AC & Heat Pump Professional certification is valid for three years. Renewal has a couple of paths worth planning for well ahead of your expiration date:
- Online exam waiver: 30 relevant continuing education units (CEUs) waive the need to retake the online exam.
- Field exam waiver: 3,000 verified relevant work hours during the preceding three years can waive the field examination - but only for your first or second renewal cycle.
- Renewal fee: The one-certification renewal application fee is $360 when the field examination is waived. If the online exam is still required (i.e., you didn't hit the 30 CEU threshold), that online exam fee is charged separately, on top of the $360 renewal fee.
This fee structure is specifically for renewal - it is not the initial certification exam fee, so don't conflate the two when budgeting. For a full cost breakdown covering both initial and renewal expenses, see the certification cost and pricing breakdown.
Key Takeaway
Track your CEUs from day one of holding the credential. Thirty relevant CEUs by renewal time means you skip re-sitting the online exam entirely.
Where the Six Domains Fit in Your Study Window
Generic study techniques only matter if you're pointing them at the right material. Here's how to sequence your study time around the domain weights rather than studying every topic equally.
Building Science & Systems Interaction (Domains 1-2, 30% combined)
- Review pressure relationships, envelope interaction, and how ductwork problems cascade into comfort and safety issues
Measurement & Verification (Domain 3, 20%)
- Drill airflow measurement and refrigerant charge verification procedures until they're automatic
Standards & Optimization (Domains 4-5, 45% combined)
- Practice navigating BPI Standards documents quickly; study commissioning and maintenance optimization workflows
Health & Safety plus Field Exam Prep (Domain 6, CAZ/CO focus)
- Concentrate on combustion safety testing procedures given the 85% field exam threshold on CAZ and CO
Reserve your final days before the exam for full run-throughs under timed conditions - 100 questions in two hours doesn't leave room to second-guess every item. If you want a more detailed week-by-week plan built specifically around this credential, the first-attempt study guide expands on this structure considerably. You can also run realistic timed practice sessions on our practice test platform to get a feel for the pacing before test day.
Quick Reference Table
| Item | New Candidate | BPI Core Holder |
|---|---|---|
| Online question count | 100 questions | 50 questions |
| Online time limit | 2 hours | 90 minutes |
| Online passing score | 70% | 70% |
| Field exam length | 2 hours | 2 hours |
| Field passing requirement | 70% overall + 85% CAZ/CO | 70% overall + 85% CAZ/CO |
| Completion window | 12 months from first exam | 12 months from first exam |
| Certification validity | 3 years | 3 years |
This table is a snapshot, not a substitute for reading the passing-score mechanics in full - the passing score breakdown walks through exactly how the 70% and 85% thresholds interact on the field exam.
Who This Credential Speaks To
Because the domains span building science, systems interaction, and combustion safety - not just AC repair - the credential tends to resonate with employers doing home performance contracting, weatherization work, and HVAC service that touches whole-building diagnostics rather than isolated equipment swaps. If you're weighing whether the investment of time and testing fees makes sense for your career path, the ROI analysis on whether this certification is worth it and the earnings and salary guide both dig into that question further. For a sense of the roles that specifically look for this credential, browse AC & Heat Pump Professional job listings and typical employers.
If you want to understand how pass outcomes tend to break down by domain performance, the pass rate data page covers what's publicly documented. And if terminology is still tripping you up - what the letters stand for, how it differs from similarly-named credentials - the explainer on what AC & Heat Pump Professional stands for and the plain-language definition of what a certified professional actually is clear that up quickly. You can also review the training resources page if you're deciding whether to pair self-study with a formal course, and try a diagnostic run on the main practice test hub to see where your knowledge gaps sit relative to these six domains.
New candidates answer 100 multiple-choice questions in two hours. Candidates who already hold a BPI Core certification take a shorter 50-question exam with a 90-minute limit.
You need 70% overall, plus at least 85% specifically on the CAZ (Combustion Appliance Zone) and CO (carbon monoxide) sections. Missing either threshold means a failed field exam even with a strong overall score.
The online exam is closed book except for BPI Standards, which are provided through the testing platform itself. The field exam is open book, but you cannot receive help from another person during testing.
No specific course is mandatory. You do need EPA Section 608 Type II or Universal certification as a prerequisite, but how you prepare content-wise is up to you.
Certification lasts three years. At renewal, 30 relevant CEUs waive the online exam, and 3,000 verified relevant work hours over the prior three years can waive the field exam for your first or second renewal. The renewal application fee is $360 when the field exam is waived, with the online exam fee added separately if that exam is still required.