- What GCA-II Certification Actually Is
- Who Regulates and Administers the Exam
- Exam Format and Scoring
- The Four Content Domains
- Eligibility Requirements
- Application Fees and Timelines
- Who Needs GCA-II and Who Hires For It
- Renewal and Continuing Education
- A Practical Way to Approach Prep
- Frequently Asked Questions
- GCA-II is Georgia's Class II unrestricted conditioned-air contractor license, regulated by the state's licensing board and administered by PSI.
- The exam has 100 scored questions plus 20 unscored pretest items across 7 hours, split into two 3.5-hour parts.
- You need a scaled score of 70 to pass, and the test is open book under PSI's approved-reference rules.
- Class II requires five years of qualifying experience above Class I's 175,000 BTU heating / 60,000 BTU cooling limits.
What GCA-II Certification Actually Is
GCA-II stands for the Georgia Conditioned Air Contractor Class II Examination, the credentialing exam that leads to Georgia's Class II unrestricted conditioned-air contractor license. This is not a generic HVAC badge or a national certificate - it is a state-specific licensing exam tied directly to Georgia law, and it exists to verify that a contractor can legally design, install, and service larger conditioned-air systems without the tonnage restrictions that apply to a Class I license.
If you've searched around and found conflicting information, it's likely because "GCA-II" is used by other, unrelated credentials elsewhere. This site and this article are strictly about the Georgia licensing exam. For a deeper dive into terminology and scope, see What Is GCA-II? and GCA-II Meaning.
Who Regulates and Administers the Exam
The Georgia State Construction Industry Licensing Board, through its Division of Conditioned Air Contractors, sets the rules for who can sit for the Class II exam and what the license permits once earned. PSI is the third-party testing vendor that actually delivers the exam, but only after the Board has approved your application. This two-party structure - Board approval, then PSI delivery - is a detail candidates often miss, and it directly affects how far in advance you need to apply. See GCA-II Exam Dates 2026: Testing Windows, Deadlines & Scheduling for scheduling specifics.
Exam Format and Scoring
The GCA-II exam is built around 100 scored questions plus an additional 20 unscored pretest questions mixed in without being identified, for a total of 120 questions. Candidates get 7 hours total, split into two 3.5-hour sittings. To pass, you need a final scaled score of 70.
Two format details separate this exam from a lot of trade licensing tests:
- It's open book. You're allowed to bring approved references under PSI's rules, which changes your entire prep strategy - memorization matters less than knowing where to find and how to apply information quickly.
- Only a silent, non-programmable calculator is permitted. Given how calculation-heavy the System Design domain is, practicing with the exact calculator you'll bring to test day is not optional.
For a full breakdown of what "passing" actually requires numerically, read GCA-II Passing Score 2026: Exactly What You Need to Pass.
Key Takeaway
Because the exam is open book, spend prep time building a fast, tabbed reference system rather than trying to memorize formulas cold. Speed of lookup under timed conditions is a skill you have to practice, not assume.
The Four Content Domains
PSI organizes the GCA-II exam into four domains. Understanding how these map to the 120 total questions is the single most useful planning tool you have.
Domain 1: Regulations, Laws, and Administrative Functions
Covers the legal and administrative framework a Class II contractor operates under in Georgia - licensing board rules, permitting obligations, and administrative responsibilities tied to running a legitimate contracting business.
- Board authority and licensing structure
- Contractor obligations and administrative compliance
Domain 2: System Design
This is the dominant domain on the exam. It covers load calculation, equipment sizing, and duct/system design for conditioned-air systems that exceed Class I's BTU limits.
- Manual J and Manual D application (load calculation and duct design)
- Manual N and Manual Q concepts as they relate to commercial/larger-scale design
- Equipment selection and sizing above Class I thresholds
Domain 3: Installation
Focuses on correctly installing conditioned-air systems in accordance with code and manufacturer specifications, including larger equipment that falls outside Class I scope.
- Installation sequencing and code compliance
- Equipment placement and system integration
Domain 4: Maintain and Repair System
Tests your ability to diagnose, service, and repair conditioned-air systems after installation, including troubleshooting logic for unrestricted-tonnage equipment.
- Diagnostic procedures
- Preventive maintenance and repair practices
Because System Design carries the most weight, most candidates schedule their heaviest review blocks there. For a domain-by-domain study breakdown with more detail than fits here, see GCA-II Exam Domains 2026: Complete Guide to All 4 Content Areas.
| Domain | Focus Area | Relative Weight |
|---|---|---|
| Domain 1 | Regulations, Laws, and Administrative Functions | Supporting |
| Domain 2 | System Design | Dominant |
| Domain 3 | Installation | Supporting |
| Domain 4 | Maintain and Repair System | Supporting |
Eligibility Requirements
Class II is not an entry-level license - it's built for experienced contractors ready to work beyond Class I's tonnage caps. To apply, you need:
- Five years of qualifying conditioned-air experience
- Documented experience on systems above the Class I limits of 175,000 BTU heating and 60,000 BTU cooling
- Three professional references
- EPA certification
- Completion of Board-approved Manuals J&D and N&Q coursework
Each of these is a hard gate - missing one means your application won't move forward regardless of how well you'd score on the exam itself. For the complete eligibility breakdown, including how the Board evaluates qualifying experience, see GCA-II Requirements 2026: Eligibility, Prerequisites & How to Qualify.
Application Fees and Timelines
The initial application fee is $110. Once the Board approves your application, that approval to test is valid for one year, giving you a defined window to schedule and sit for the exam through PSI. Miss that window and you'll need to reapply.
Fees are only one piece of the total cost picture - coursework, references documentation, and study materials add up too. A full cost breakdown is available in GCA-II Certification Cost 2026: Complete Pricing Breakdown.
Who Needs GCA-II and Who Hires For It
The Class II license is aimed at conditioned-air professionals who want to legally take on larger commercial and industrial jobs - projects where equipment capacity routinely exceeds Class I's residential-oriented BTU caps. Contractors pursuing this credential are typically already running or working within an HVAC contracting business and are looking to expand the scope of jobs they can bid and perform under their own license.
Because the license is Georgia-specific and tied to unrestricted system size, employers and clients who need larger commercial installs, multi-unit properties, or higher-capacity mechanical work often specifically require or prefer a Class II holder over a Class I contractor. If you're evaluating whether pursuing this license fits your career plans, GCA-II Jobs and Is the GCA-II Certification Worth It? Complete ROI Analysis 2026 both dig into practical outcomes, and GCA-II Salary Guide 2026: Complete Earnings Analysis looks at earnings considerations tied to the license.
Renewal and Continuing Education
Once licensed, Class II contractors renew by November 30 of odd-numbered years and must complete 8 continuing-education hours per renewal cycle. This keeps the license active and ensures contractors stay current on code and practice changes affecting larger conditioned-air systems. Missing the renewal deadline or CE requirement can lapse your license, so it's worth calendaring well ahead of the odd-year deadline rather than treating it as an afterthought.
A Practical Way to Approach Prep
Given that System Design is the dominant domain and the exam is open book, the most efficient prep sequence usually front-loads design-heavy material, then moves to the supporting domains.
System Design Deep Dive
- Work through Manual J load calculation problems repeatedly
- Practice Manual D duct sizing using your actual test-day calculator
- Review Manual N and Q concepts for larger-system application
Installation and Regulations
- Study installation sequencing and code compliance topics
- Review Board rules, licensing structure, and administrative obligations
Maintenance/Repair and Full Timed Runs
- Cover diagnostic and repair procedures for Domain 4
- Run full-length, timed practice sessions across both 3.5-hour blocks
- Build and organize your open-book reference tabs
This isn't a generic weekly template - it's sequenced specifically around GCA-II's domain weighting, so the domain that carries the most exam questions gets the most runway. For a more detailed week-by-week plan and first-attempt strategy, see GCA-II Study Guide 2026: How to Pass on Your First Attempt. If you want a sense of how challenging candidates generally find the exam before you commit to a timeline, How Hard Is the GCA-II Exam? Complete Difficulty Guide 2026 and GCA-II Pass Rate 2026: What the Data Shows are useful starting points.
Running full-length, timed practice sessions on our GCA-II practice test platform is one of the most direct ways to build stamina for the two 3.5-hour parts and get comfortable with the open-book pacing before test day. A condensed reference like the GCA-II Cheat Sheet 2026: One-Page Review of Must-Know Facts can also help you drill the numbers - BTU thresholds, fee amounts, renewal dates - that show up regardless of which domain a question falls under.
Frequently Asked Questions
No. GCA-II is the Class II unrestricted license, which removes the BTU capacity limits that apply to Class I (175,000 BTU heating / 60,000 BTU cooling). Class II requires more experience and covers larger systems.
There are 100 scored questions plus 20 unscored pretest questions, for 120 total, delivered across two 3.5-hour parts totaling 7 hours.
Yes, the exam is open book under PSI's approved-reference rules. You're also allowed a silent, non-programmable calculator, which matters heavily for the System Design domain.
Five years of qualifying conditioned-air experience, including documented work on systems above Class I's BTU limits, plus three references, EPA certification, and Board-approved Manuals J&D and N&Q coursework.
Board approval to sit for the PSI-administered exam is valid for one year from approval, so you'll want to schedule your test date within that window.