- What the GCA-II Certification Actually Covers
- Who Regulates and Administers the Exam
- Exam Format, Timing, and Scoring
- The Four Exam Domains
- Eligibility and Application Requirements
- Fees, Approval Window, and Renewal Cycle
- Who Needs This License and Why
- Building a Preparation Plan Around the Domains
- Frequently Asked Questions
- The Georgia State Construction Industry Licensing Board's Division of Conditioned Air Contractors oversees Class II, with PSI administering the exam.
- The exam has 100 scored questions plus 20 unscored pretest items across two 3.5-hour parts, totaling 7 hours.
- Passing requires a scaled score of 70, and the test is open book using PSI's approved-reference rules.
- Applicants need five years of qualifying experience above Class I's 175,000 BTU heating/60,000 BTU cooling limits.
What the GCA-II Certification Actually Covers
The Georgia Conditioned Air Contractor Class II Examination (GCA-II) is the credentialing exam behind Georgia's unrestricted Class II conditioned air contractor license. This license authorizes work on HVAC systems without the capacity caps that apply to Class I contractors, making it the designation most commercial and larger residential mechanical contractors pursue. If you're still getting oriented, our overview pages What Is GCA-II?, GCA-II Meaning, and What Does GCA-II Stand For? walk through the basics before you dive into exam mechanics.
Unlike a generic HVAC knowledge test, the GCA-II exam is built specifically around Georgia's licensing statutes, the state's approved reference materials, and the practical scope of work a Class II contractor is legally allowed to perform. Every question ties back to either regulatory compliance, system design calculations, installation practice, or ongoing maintenance and repair - the four domains we break down below.
Who Regulates and Administers the Exam
The Georgia State Construction Industry Licensing Board, through its Division of Conditioned Air Contractors, is the regulatory body responsible for the Class II unrestricted license. The Board approves candidates before they're permitted to sit for the exam, and PSI is the testing organization that actually administers it once that approval is granted.
This two-step structure - Board approval, then PSI scheduling - means your paperwork has to clear before you can even register for a test date. For a full walkthrough of eligibility documentation, see GCA-II Requirements 2026: Eligibility, Prerequisites & How to Qualify.
Exam Format, Timing, and Scoring
The GCA-II exam is delivered in two parts, each 3.5 hours long, for a total of 7 hours of testing time. Within that time, candidates answer 100 scored questions along with 20 unscored pretest questions that PSI uses to evaluate future exam content - you won't know which items are scored, so every question deserves full attention.
To pass, you need a final scaled score of 70. Scaled scoring means the raw number of questions answered correctly is converted to a standardized scale, so the passing threshold isn't necessarily "70 out of 100 correct." For a deeper explanation of how scaled scoring works for this exam, read GCA-II Passing Score 2026: Exactly What You Need to Pass.
Key Takeaway
Because the exam is open book under PSI's approved-reference rules, your preparation should focus as much on knowing where information lives in your references as on memorizing it outright. Tab and organize your approved materials well before test day.
The exam permits a silent, non-programmable calculator, which matters most during the System Design domain where load calculations and duct sizing problems require arithmetic under time pressure. Since the test is open book, familiarity with navigating your approved references quickly is arguably as valuable as raw memorization. If you're wondering how the overall difficulty compares to other trades licensing exams, How Hard Is the GCA-II Exam? Complete Difficulty Guide 2026 covers that in detail, and GCA-II Pass Rate 2026: What the Data Shows looks at the data available on outcomes.
The Four Exam Domains
The GCA-II exam is organized into four domains, and System Design carries the most weight of the four. Understanding what each domain actually tests - not just its title - is the difference between generic HVAC review and targeted GCA-II preparation.
Domain 1: Regulations, Laws, and Administrative Functions
This domain tests your knowledge of the statutes and administrative rules governing Georgia conditioned air contracting, including licensing board authority, contractor responsibilities, and permit requirements.
- Board structure and the scope of Class II unrestricted licensure
- Contractor obligations under state law
- Permitting and inspection procedures tied to conditioned air work
Domain 2: System Design
As the dominant domain on the exam, System Design covers load calculations, equipment sizing, and duct design principles that a Class II contractor must apply on projects exceeding Class I's 175,000 BTU heating and 60,000 BTU cooling thresholds.
- Manual J and Manual D calculation methodology
- Manual N and Manual Q applications for commercial-scale considerations
- Matching equipment capacity to structural and load requirements
Domain 3: Installation
This domain focuses on the practical placement and setup of conditioned air systems, including equipment, ductwork, and related components in accordance with code and manufacturer specifications.
- Proper equipment placement and clearance requirements
- Ductwork installation and sealing practices
- Refrigerant line set and electrical connection basics relevant to installation
Domain 4: Maintain and Repair System
This domain addresses the ongoing service side of conditioned air work - diagnosing problems, performing repairs, and maintaining systems for continued performance and safety.
- Diagnostic sequencing for common system failures
- Preventive maintenance schedules and tasks
- Repair procedures that keep systems compliant with code
For a domain-by-domain breakdown with study emphasis recommendations, see GCA-II Exam Domains 2026: Complete Guide to All 4 Content Areas.
| Domain | Primary Focus | Relative Weight |
|---|---|---|
| Regulations, Laws, and Administrative Functions | State licensing law and administrative compliance | Standard |
| System Design | Manual J/D/N/Q load calculations, equipment sizing | Dominant |
| Installation | Equipment and ductwork installation practices | Standard |
| Maintain and Repair System | Diagnostics, maintenance, and repair procedures | Standard |
Eligibility and Application Requirements
Before you can register for the exam, Georgia requires Class II applicants to document five years of qualifying conditioned-air experience. Critically, that experience must include work on systems above the Class I limits - meaning projects beyond 175,000 BTU heating and 60,000 BTU cooling capacity. Experience limited to smaller residential systems typically won't satisfy this requirement on its own.
Beyond the experience requirement, applicants need:
- Three professional references who can attest to qualifying experience
- Current EPA certification
- Completion of Board-approved coursework covering Manuals J, D, N, and Q
A complete checklist of documentation, verification steps, and common application pitfalls is available in GCA-II Requirements 2026: Eligibility, Prerequisites & How to Qualify. If you're still deciding whether Class II is the right path for your career stage, Is the GCA-II Certification Worth It? Complete ROI Analysis 2026 lays out the considerations.
Fees, Approval Window, and Renewal Cycle
The initial application fee for the GCA-II process is $110. Once the Board approves your application, that approval remains valid for one year - meaning you need to schedule and sit for the PSI exam within that window before approval expires and you'd need to reapply.
After passing, licenses must be renewed by November 30 of odd-numbered years, and each renewal cycle requires 8 hours of continuing education. Missing these deadlines can lapse an active license, so building renewal dates into a calendar early matters as much as passing the exam itself.
For a complete cost breakdown including how the application fee fits into total certification expenses, visit GCA-II Certification Cost 2026: Complete Pricing Breakdown. Scheduling specifics and testing windows are covered in GCA-II Exam Dates 2026: Testing Windows, Deadlines & Scheduling.
Who Needs This License and Why
The Class II unrestricted license removes the capacity ceiling that constrains Class I contractors, which is why it's the target credential for HVAC professionals moving into larger commercial installations, multi-family developments, and industrial mechanical work. Employers hiring for lead installer, project supervisor, and mechanical contractor roles frequently require or strongly prefer this license because it signals the holder can legally take on systems beyond residential-scale capacity.
If you're evaluating career trajectory or compensation potential tied to holding this license, GCA-II Salary Guide 2026: Complete Earnings Analysis and GCA-II Jobs cover the employment landscape in more depth. And for anyone still unclear on foundational terminology, What Is A GCA-II? and What Does GCA-II Mean? are good starting points before returning to exam-specific material.
Building a Preparation Plan Around the Domains
Because System Design dominates the exam and directly reflects the Manual J, D, N, and Q coursework required for eligibility, your study schedule should weight that domain heaviest - but not exclusively. A practical approach spreads preparation across all four domains while giving System Design extra repetition on calculation problems, since those questions reward practiced speed rather than one-time understanding.
Regulations and Administrative Functions
- Review Board authority, contractor obligations, and permitting rules
- Study Georgia-specific statutory language rather than generic code summaries
System Design
- Work through Manual J and Manual D load calculation problems repeatedly
- Practice Manual N and Manual Q scenarios for larger-capacity systems above Class I limits
- Time yourself using a non-programmable calculator to simulate exam conditions
Installation
- Review equipment placement, ductwork, and connection standards
- Cross-reference installation questions against your approved open-book materials
Maintain and Repair System
- Run through diagnostic sequences for common failure scenarios
- Review maintenance schedules and repair documentation standards
For a structured, week-by-week study framework built specifically around this exam's domain weighting, see GCA-II Study Guide 2026: How to Pass on Your First Attempt. And once you've covered the material, running through practice questions on our practice test platform is the fastest way to identify which domain still needs work before your PSI appointment.
Key Takeaway
Don't split study time evenly across domains. Since System Design is dominant and directly tied to your required coursework, allocate roughly double the time to load calculation practice compared to the other three domains combined.
A quick-reference summary of the facts covered in this article - fees, timing, domains, and score requirements - is compiled in GCA-II Cheat Sheet 2026: One-Page Review of Must-Know Facts, which is useful for a final review pass the night before your exam. For structured practice questions across all four domains, start with a full practice test to gauge your baseline before committing to a study timeline.
Frequently Asked Questions
Yes. The exam is open book under PSI's approved-reference rules, and candidates may also bring a silent, non-programmable calculator into the testing room.
The exam totals 7 hours across two 3.5-hour parts, with 100 scored questions and 20 additional unscored pretest questions mixed in throughout.
You need a final scaled score of 70. This is a converted score, not necessarily a raw percentage of questions answered correctly.
Applicants need five years of qualifying conditioned-air experience, including work on systems above the Class I limits of 175,000 BTU heating and 60,000 BTU cooling, along with three references, EPA certification, and completed Manuals J&D and N&Q coursework.
Licenses renew by November 30 of odd-numbered years, and each renewal cycle requires 8 hours of continuing education.