What Is ACR?

What Is ACR?

ACR is the Texas Air Conditioning and Refrigeration Contractor License Exam, the licensing test overseen by the Texas Department of Licensing and Regulation (TDLR) for individuals who want to hold a Class A air conditioning and refrigeration contractor license in Texas. Specifically, it refers to the Environmental Air Class A examination - the version of the test that covers environmental air-conditioning work with no equipment-size restriction, making it the broadest ACR license available in the state.

If you've searched "what is ACR" and landed on results about a completely different credential in another industry, that's not the exam this site covers. Everything on ACR Certification and throughout this site refers exclusively to the Texas TDLR-regulated ACR exam administered through PSI. That distinction matters because fees, domain weights, and requirements vary widely between unrelated credentials that happen to share the same three letters.

Who Administers the Exam and Why It Exists

TDLR sets the licensing rules, experience requirements, and renewal terms for Class A contractors; PSI is the third-party testing company that builds, delivers, and scores the actual exam. This split is common in state licensing: TDLR decides who is eligible and what the license means, while PSI runs the computer-based testing centers and enforces exam-day procedures.

The exam exists so that anyone contracting environmental air-conditioning work in Texas - installing, servicing, and designing systems without a size cap - has demonstrated a baseline of technical knowledge and familiarity with Texas law before being trusted to pull permits and supervise jobs. Employers, general contractors, and property managers use the Class A license as a filter when hiring or subcontracting, which is part of why passing the exam has real career weight; see ACR Jobs for how the license translates into hiring opportunities.

What the ACR Exam Actually Tests

The exam is built from 120 scored multiple-choice items spread across 14 content domains, plus 5 additional non-scored items used for future exam development that you won't be able to identify during testing. The domains reflect the day-to-day scope of Class A environmental air work: sizing and installing distribution systems, understanding refrigeration principles, wiring controls, verifying combustion air and venting, and applying Texas law correctly.

The remaining eleven domains each carry smaller but still meaningful weight: Service (10%) and Testing (10%) test practical field competency; Basic Refrigeration Components (5%), Combustion Air (5%), Controls (5%), Piping (5%), Refrigeration Principles (5%), Safety (5%), Texas Laws and Rules (5%), and Ventilation (5%) each represent focused technical or regulatory knowledge; and Venting (4.17%) rounds out the smallest slice. A full breakdown of what's tested in each area - with more granular topic lists - is available in the ACR Exam Domains 2026: Complete Guide to All 14 Content Areas.

Exam Format, Registration, and Fees

The ACR exam is a computer-based test delivered in person at a PSI testing center, available in both English and Spanish. You'll have 4 hours to work through 120 scored and 5 non-scored multiple-choice questions, and a score of 70% or higher is required to pass. The current PSI candidate bulletin was updated July 9, 2026, and reflects reference materials scheduled to shift on September 1, 2026, when the 2024 IMC, IFGC, and UMC editions take effect - a detail worth confirming close to your exam date since code editions do change.

One feature that surprises candidates coming from other licensing exams: this is an open-book test. You're allowed to bring approved reference materials into the testing room, and those references may already contain preexisting notes, highlighting, underlining, and permanent tabs. A compliant nonprogrammable calculator is also permitted. This changes the entire preparation strategy - the goal isn't pure memorization, it's knowing your references well enough to find the right formula or code section quickly under time pressure.

Because this is a closed-book-adjacent-but-open-reference format, exact passing mechanics matter. If you want the specifics on how scoring and the 70% threshold work, see ACR Passing Score 2026: Exactly What You Need to Pass. For scheduling logistics and how far in advance to register at a PSI center, check ACR Exam Dates 2026: Testing Windows, Deadlines & Scheduling.

Who Can Sit for the Exam

Eligibility is built around verified field experience rather than classroom hours alone. Applicants must be at least 18 years old and generally need one of two experience paths:

• 48 months of supervised practical experience within the preceding 72 months, or
• 12 months working as a certified technician plus 36 months of qualifying experience within the preceding 48 months

TDLR allows approved substitutions in certain cases, so candidates with related education or alternate work history should confirm how those apply to their specific timeline before assuming they don't qualify. For the full eligibility breakdown, including how substitutions are evaluated, see ACR Requirements 2026: Eligibility, Prerequisites & How to Qualify.

After You Pass: License, Renewal, and Insurance

Passing the exam is only one part of becoming a licensed Class A contractor. Once licensed, the credential is valid for one year and renews for a $65 fee, contingent on completing eight hours of continuing education - including one hour specifically on Texas law and rules. Skipping that law-and-rules hour, or letting renewal lapse, can create gaps in your ability to legally contract work.

Class A contractors are also required to carry commercial general liability insurance meeting specific minimums: $300,000 per occurrence, $600,000 aggregate, and $300,000 for products and completed operations. These are not optional extras - they're part of maintaining an active license, and contractors bidding larger commercial environmental air jobs should expect general contractors and property owners to ask for proof of this coverage.

How Difficult Is the ACR Exam?

The exam's structure - 120 scored questions across 14 domains, a 4-hour window, and a 70% passing threshold - makes it a broad but manageable test if you approach it systematically. The open-book format helps, but it also means the exam is designed to test application and judgment rather than rote recall, since you can look up a formula but still need to know which formula applies to the scenario in front of you.

Recent first-time pass rate data shows a meaningful share of candidates do not clear the exam on their first attempt, which underscores that "open-book" does not mean "easy." Candidates who treat their reference materials as a crutch instead of a tool tend to run out of time or misapply the wrong section under pressure. For a deeper look at what makes specific domains harder than others, read How Hard Is the ACR Exam? Complete Difficulty Guide 2026, and for the actual pass-rate figures and what they suggest about preparation gaps, see ACR Pass Rate 2026: What the Data Shows.

Building a Study Plan Around the Domain Weights

Because Air Distribution, Equipment Requirements and Design, and HVAC Systems together account for more than a third of the scored items, an efficient study plan front-loads those three domains before spreading remaining time across the smaller-weighted areas. A generic weekly template won't reflect that imbalance - your schedule should mirror the exam's own point distribution.

For a more detailed, domain-by-domain study strategy with additional guidance on reference-tabbing and pacing, see the ACR Study Guide 2026: How to Pass on Your First Attempt. You can also run through timed practice questions on the main ACR practice test platform to get comfortable with the multiple-choice format before your official exam date.

Why the ACR License Matters for Your Career

Holding a Class A ACR license signals to employers and clients that you can legally contract environmental air-conditioning work without an equipment-size cap - a meaningful distinction from more limited license classes. That scope shows up in hiring decisions, subcontracting eligibility, and the size of jobs you can bid on independently. If you're weighing whether the time, cost, and continuing-education commitment are worth it relative to your career goals, Is the ACR Certification Worth It? Complete ROI Analysis 2026 walks through that calculation, and ACR Salary Guide 2026: Complete Earnings Analysis looks at how licensing connects to earning potential in the field.

Before you commit to a study plan, it also helps to get comfortable with practice-style questions early. Spending time on a full-length ACR practice exam lets you gauge which of the 14 domains need the most attention before you lock in a final review schedule.

Frequently Asked Questions