Free practice questions for the Texas Air Conditioning and Refrigeration Contractor exam, Environmental Air endorsement — the PSI test behind the TDLR Class A and Class B HVAC contractor license — with a written explanation on every answer, in English, Spanish, and Russian.
8 questions, about 4 minutes. No account needed — pick an answer to see whether it's right and read the explanation, the same explanations you get on every question in the full course.
Practice across the full question bank.
Understand why the correct answer works — not just which letter is right.
Spend more time on the questions you miss.
Practice under exam-style time pressure before exam day.
Every question tells you why the correct answer is correct and defines the terms it uses — so you learn the rule, not just the answer.
Questions are written from scratch against the official codes and agency publications for this exam — never copied from the real exam.
Every question and explanation is fully translated, with the English exam term kept alongside — not a shallow machine translation.
LICENA is a practice tool, not a school. We don't promise a pass — we help you understand the material and walk in prepared.
The full Texas ACR Environmental Air course is 500 questions across 5 blocks mapped to PSI's own 14 subject areas for Class A — Air Distribution 18, Equipment Requirements and Design 14, Service 12, Testing 12, HVAC Systems 11, Basic Refrigeration Components 6, Combustion Air 6, Controls 6, Piping 6, Refrigeration Principles 6, Safety 6, Texas Laws and Rules 6, Ventilation 6, Venting 5 (Class B uses the same areas scaled to 100) — written to the exam's own references: the 2024 IMC, IFGC and UMC, Texas Occupations Code chapter 1302, 16 TAC chapter 75, plus 29 CFR 1926 and 40 CFR 82 for safety and refrigerant handling.
Exam structure, topics, study areas and official resources.
The Environmental Air exam is the test behind a Texas air conditioning and refrigeration contractor license with the environmental air endorsement — the license for heating, cooling and ventilation of buildings for human comfort. TDLR issues the license; PSI gives the exam. The current bulletin (Updated 7/9/2026) sets the format: Class A is 120 scored questions in 230 minutes, Class B is 100 scored questions in 170 minutes, 70% to pass either, open book — and effective September 1, 2026 the exams are referenced to the 2024 International Mechanical Code, 2024 International Fuel Gas Code and 2024 Uniform Mechanical Code. Practice it in the free sample above: no sign-up, with a written explanation on every question.
Texas Occupations Code §1302.253 splits the contractor license by size: a Class A license covers equipment of any size or capacity, while a Class B license is limited to systems of not more than 25 tons cooling capacity or 1.5 million Btu/h output heating capacity — and TDLR's rule 16 TAC §75.22(c) applies that limit unit by unit, so a Class B contractor may work in a building whose combined capacity is larger as long as no single unit exceeds it. Both classes sit for the same fourteen subject areas; PSI's bulletin gives Class A 120 scored items in 230 minutes and Class B 100 scored items in 170 minutes, each with 5 non-scored items and 10 added minutes, each with a 70% passing score, fees $74 and $60. Eligibility (§1302.255) is 48 months of supervised ACR experience in the preceding 72 months, or 36 months in 48 for someone who has held a technician certification for the preceding 12 months, with education credits available under subsection (c).
The exam is open book. PSI's bulletin lists three groups of references: business and law — Texas Occupations Code chapter 1302, 16 Texas Administrative Code chapter 75 and 29 CFR part 1904; the codes — the International Mechanical Code, the International Fuel Gas Code and the Uniform Mechanical Code; and technical references — Modern Refrigeration and Air Conditioning (22nd edition), the ADI Duct Size Calculator and, for Environmental Air only, ACCA Manuals D, J and S. The bulletin states twice, in capitals, that effective September 1, 2026 the examinations are referenced to the 2024 IFGC, IMC and UMC, and TDLR's rule 16 TAC §75.110 adopted the same 2024 editions on the same date — so a 2021 code is now the wrong book. For code questions the exam is based only on the listed edition. Books may be highlighted, underlined, annotated and tabbed with permanent tabs before the session; during the exam you may not write in them, temporary and Post-It tabs are not allowed, and no loose paper comes in.
For Class A the bulletin prints Air Distribution 18 (airflow, duct installation and sizing, filtration, return and supply grilles, static pressure), Equipment Requirements and Design 14 (sensible and latent capacities, heat loads, HVACR codes, voltage), Service 12 (electrical, diagnostics, refrigerant recovery, superheat, subcooling), Testing 12 (airflow, combustion, electrical, gas), HVAC Systems 11 (components, installation, refrigeration systems), then Basic Refrigeration Components, Combustion Air, Controls, Piping, Refrigeration Principles, Safety, Texas Laws and Rules and Ventilation at 6 each, and Venting 5. Class B keeps the same list at 15, 12, 10, 10, 9, 5 for each of the middle group and 4 for Venting. Read it as a plan: air distribution plus equipment design is more than a quarter of the exam, and service plus testing is another fifth — the arithmetic of airflow, capacity, superheat and voltage is where an open book helps least and practice helps most.
There is no separate business-and-law exam for an ACR contractor in Texas, and Texas has no statewide general-contractor license, so the Texas Laws and Rules area — 6 items on Class A, 5 on Class B — is the whole legal test. It draws on Occupations Code chapter 1302 (license classes and endorsements, eligibility, exemptions, disciplinary grounds) and 16 TAC chapter 75 (insurance limits, responsibilities of the contractor and the contracting company, technical requirements such as the limits on electrical and gas work a licensee may perform, continuing education, fees). One structural rule to know cold: the endorsement, not the class, decides the type of work. Under §1302.254 a license carries an environmental air conditioning endorsement, a commercial refrigeration and process cooling or heating endorsement, or both, and a licensee may not do a type of work the license is not endorsed for — a Class A environmental-air contractor still cannot install a walk-in cooler.
TDLR approves your eligibility and emails scheduling instructions; you book online at test-takers.psiexams.com/tdlnrp or by phone at (833) 333-4741 and test by computer at one of PSI's Texas sites — Abilene, Amarillo, Arlington, Austin, Corpus Christi, Dallas, El Paso, Fort Worth, Harlingen, Houston, Lubbock, McAllen, Midland, San Antonio, Tyler, Waco and others listed in the bulletin. Arrive 30 minutes early with one valid government-issued photo ID; cancel or reschedule at least 2 days ahead or the fee is forfeited. All ACR exams are available in English and Spanish at no additional cost — choose the language when you schedule. Your score appears on screen when time ends, with a diagnostic report by subject area if you do not pass, and you may test as many times as needed within your eligibility period; under 16 TAC §75.20 every license requirement including the exam must be completed within one year of filing the application.
The full LICENA Texas ACR Environmental Air course is 500 questions across five blocks mapped to PSI's 14 areas. At 30 questions a day that is about three weeks: one pass to find the gaps, a second pass on the areas you missed, then the timed final at 120 questions in 230 minutes — just under two minutes per question, tighter than most candidates expect from an open-book exam. That pace is the argument for practicing lookups rather than memorizing: tab the IMC, IFGC and UMC early and use the same tabs every session, and keep Occupations Code 1302 and 16 TAC 75 printed and bound as the bulletin allows. Drill the sensible-heat, airflow and voltage arithmetic on paper. If you also need EPA certification for refrigerant work, the free EPA 608 practice test covers those federal rules in depth.
Try the full bank free for 3 days — no card needed. Then $9.99 for your first month and $19.99/month after that if you decide to continue, cancel anytime. A school sells a full prepaid package; this is a question bank you can stop at any time — and you study on your phone, in your language, whenever you have a few minutes.
Continue Texas ACR practice The free sample above stays free. Creating an account is free — no card needed.LICENA gives you practice questions to study with. We are not an accredited school and we do not guarantee that you will pass any exam.
LICENA provides online practice only. Registration, testing and licensing are handled by the Texas Department of Licensing and Regulation (TDLR) and PSI — not by LICENA. LICENA is not affiliated with TDLR or PSI.