- EPIC Domain Overview: Why "Domains" Means Manuals
- Manual D: Residential Duct Design
- Manual J: Residential Load Calculation
- Manual H: Heat Pump Systems
- Manual P: Piping and Hydronics
- Manual S: Equipment Selection
- Manual T: Air Distribution Basics
- Manual 4: National Comfort Institute Alignment
- TT-102: Technical Training Foundations
- Exam Format: Knowledge Test Plus Live Presentation
- Who Actually Uses This Credential
- A Domain-by-Domain Study Timeline
- FAQ
- EPIC content coverage spans Manuals D, J, H, P, S, T, Manual 4, and TT-102 - not a numbered domain list.
- Candidates must score at least 80% on the online knowledge assessment before advancing.
- Passing also requires a live virtual presentation of assigned HVAC content to a panel.
- Certification stays valid for five years once earned.
EPIC Domain Overview: Why "Domains" Means Manuals
Anyone searching for a neat, numbered breakdown of "EPIC exam domains" will run into a naming problem fast: the ACCA Education Professional Instructor Certification (EPIC) isn't organized around abstract domain titles like "Domain 1: Fundamentals" or "Domain 2: Applications." Instead, ACCA defines its subject coverage directly by the technical manuals that HVACR instructors are expected to teach and defend in front of a live panel. That means the real "content areas" for EPIC are Manual D, Manual J, Manual H, Manual P, Manual S, Manual T, Manual 4, and TT-102.
This distinction matters for how you prepare. Instead of memorizing a domain outline, you need to know each manual's scope, its calculation logic, and how an experienced instructor would explain it to a room of vocational students. If you haven't already mapped out your overall approach, the EPIC Study Guide for passing on your first attempt is a useful companion to this domain breakdown, since it covers pacing and review strategy across all eight areas.
Manual D: Residential Duct Design
Manual D - Residential Duct Design
Manual D governs how conditioned air moves from equipment to living space. As an instructor, you need to explain friction rate, duct sizing charts, and static pressure budgets in a way that clicks for students who may have never seen a duct calculator.
- Friction rate selection and its relationship to total external static pressure
- Trunk-and-branch versus radial duct layout tradeoffs
- How Manual D outputs connect back to Manual J load results
Manual J: Residential Load Calculation
Manual J - Residential Load Calculation
Manual J is the backbone of residential HVAC sizing, and it's almost always heavily represented on ACCA credentialing exams because it's the foundation every other manual builds on.
- Heat gain versus heat loss variables and climate zone impact
- Envelope inputs: insulation values, window ratings, infiltration assumptions
- Common student misconceptions about oversizing and how to correct them in a classroom setting
Manual H: Heat Pump Systems
Manual H - Heat Pump Systems
Manual H content focuses on heat pump-specific design considerations that don't apply the same way to straight cooling or gas furnace systems.
- Balance point calculations and supplemental heat staging
- Defrost cycle behavior and its effect on comfort delivery
- How heat pump sizing differs from conventional split-system sizing taught under Manual J
Manual P: Piping and Hydronics
Manual P - Piping and Hydronics
Hydronic systems appear less often in day-to-day residential HVAC work, which is exactly why instructors need a firm grasp on Manual P - students often have the least exposure to it before class.
- Pipe sizing fundamentals and flow rate relationships
- Circulator pump selection basics
- Explaining hydronic distribution to students trained primarily on forced-air systems
Manual S: Equipment Selection
Manual S - Equipment Selection
Manual S ties load calculations to real equipment performance data, and it's a frequent source of confusion for students moving from theoretical Manual J numbers to actual manufacturer specification sheets.
- Matching equipment capacity to Manual J outputs at design conditions
- Reading manufacturer extended performance data tables
- Sensible versus latent capacity tradeoffs at part-load conditions
Manual T: Air Distribution Basics
Manual T - Air Distribution Basics
Manual T covers register and diffuser selection, throw patterns, and how air actually behaves once it leaves the duct system Manual D designed.
- Throw, spread, and drop terminology for supply outlets
- Return air placement logic
- Connecting Manual T outlet selection back to Manual D airflow targets
Manual 4: National Comfort Institute Alignment
Manual 4 - Installation and Verification Standards
Manual 4 rounds out the technical installation side, reinforcing quality installation standards that instructors are expected to model for students entering the trade.
- Static pressure testing procedures and documentation
- Airflow verification against design targets
- Teaching field verification as a professional habit, not an afterthought
TT-102: Technical Training Foundations
TT-102 - Technical Training Foundations
TT-102 is less about HVAC calculations and more about instructional delivery - a fitting inclusion given that EPIC certifies teaching ability alongside technical mastery.
- Structuring a technical lesson for mixed-experience classrooms
- Assessing student comprehension mid-lesson and adjusting on the fly
- Presenting dense calculation material without losing less experienced students
Key Takeaway
Study each manual in the order students would encounter it in a real HVACR program: fundamentals (TT-102) first, then load and design manuals (J, D, S), then specialized systems (H, P), then verification (Manual 4, T). This mirrors how the panel presentation portion will likely expect you to sequence a lesson.
Exam Format: Knowledge Test Plus Live Presentation
The EPIC credential is unusual among HVACR certifications because it has two distinct hurdles, not one. First is an online knowledge assessment delivered through ACCA's testing portal, where candidates must score at least 80% to move forward. Second is a virtual presentation, where the candidate teaches assigned HVAC content live to a panel made up of students and evaluators.
This two-part structure changes how you should think about "passing." Scoring well on the knowledge portion proves you know Manual J load math or Manual S selection tables - but the panel presentation proves you can actually run a classroom. For a deeper breakdown of what that 80% threshold means in practice and how scoring works, see the dedicated EPIC Passing Score guide.
| Assessment Stage | What It Measures | Format |
|---|---|---|
| Online Knowledge Assessment | Technical mastery of Manuals D, J, H, P, S, T, Manual 4, TT-102 | Online portal, minimum 80% required |
| Virtual Panel Presentation | Instructional delivery and command of assigned content | Live virtual session with student and evaluator panel |
Because the format blends a hard cutoff score with a subjective, panel-judged performance, difficulty isn't just about content recall. If you're trying to gauge how demanding this really is compared to other trade credentials, the EPIC exam difficulty guide walks through both assessment stages in more detail. It's also worth reviewing eligibility before you invest study time, since ACCA designed EPIC specifically for experienced HVACR vocational instructors - the EPIC requirements and eligibility guide covers exactly who qualifies to sit for it.
Who Actually Uses This Credential
EPIC isn't aimed at entry-level technicians. It exists for people already teaching - or about to teach - HVACR coursework at technical colleges, trade schools, apprenticeship programs, and manufacturer training centers. Because the certification assumes fundamental subject knowledge and communication ability going in, it functions less as a "prove you know HVAC" credential and more as a "prove you can transfer that knowledge" credential.
- Technical and community college HVACR instructors seeking a recognized teaching credential
- Career and technical education (CTE) high school instructors running HVAC pathways
- Apprenticeship program trainers affiliated with contractor associations
- Manufacturer or distributor training staff who run technical courses for field technicians
Because the credential centers on instructional legitimacy, program directors often use it as a hiring or advancement signal. If you're weighing whether pursuing it fits your career path, the practice tests at EPIC Exam Prep are built around this exact instructor-focused content, and the site's ROI analysis on whether EPIC certification is worth it lays out the tradeoffs in plain terms.
A Domain-by-Domain Study Timeline
Generic study techniques don't map well onto a credential built around eight named manuals plus a live teaching demonstration. Instead, sequence your prep around the manuals themselves, saving the presentation-skills work for after your technical review is solid.
Foundations and Load Calculations
- Review TT-102 instructional concepts
- Drill Manual J load calculation scenarios
Design and Selection
- Work through Manual D duct sizing problems
- Practice Manual S equipment matching exercises
Specialized Systems
- Study Manual H heat pump balance points
- Review Manual P hydronic piping basics
Verification and Presentation Prep
- Cover Manual T air distribution and Manual 4 verification standards
- Rehearse a mock panel presentation on one assigned topic
Notice that presentation rehearsal is deliberately last. You can't teach a topic convincingly to a live panel until the underlying manual content is second nature. For a more granular week-by-week breakdown across all eight areas, cross-reference this timeline with the full EPIC study guide, and check the EPIC exam dates and testing windows guide before locking in your schedule, since ACCA's Fall 2026 rollout may affect availability.
FAQ
No. ACCA defines EPIC content coverage by technical manual rather than by numbered domain titles. The eight coverage areas are Manual D, Manual J, Manual H, Manual P, Manual S, Manual T, Manual 4, and TT-102.
ACCA hasn't published a weighted breakdown, especially with the program being rewritten for Fall 2026. Manual J load calculations tend to underpin content in several other manuals, so it's a reasonable priority area regardless of exact weighting.
The program is designed for experienced HVACR vocational instructors and assumes fundamental subject knowledge and communication ability already in place. Check the full requirements guide for specific eligibility details before registering.
ACCA's published process requires both the 80% knowledge assessment score and a successful virtual presentation to a panel of students and evaluators. Both stages must be completed successfully for certification to be awarded.
Successful EPIC certification is valid for five years, after which instructors would need to go through a renewal or recertification process as defined by ACCA.
Whichever manual gives you the most trouble, targeted practice questions modeled on real EPIC content are the fastest way to close the gap - explore the domain-specific question sets at EPIC Exam Prep to test your readiness before exam day.