1.1 TDLR Licensing Framework, Class A vs Class B Scope, and Technician Registration
Key Takeaways
- Texas Occupations Code Chapter 1302 and 16 TAC Chapter 75 establish TDLR as the regulatory authority governing all Air Conditioning and Refrigeration (ACR) contracting and technician activities across Texas.
- Class A licenses carry no capacity limitations, whereas Class B licenses restrict work to cooling systems up to 25 tons per single unit and heating systems up to 1,500,000 BTU/hr per single unit.
- Texas defines only two ACR endorsements: Environmental Air Conditioning (code E) and Commercial Refrigeration and Process Cooling or Heating (code R); a contractor holding both carries the Combined code C, and no license number ends in "P".
- License applicants must document 48 months of practical experience under a licensed contractor within the past 72 months, with up to 24 months allowable as educational substitution.
- Technicians must register with TDLR before performing ACR work; obtaining Certified ACR Technician status requires 24 months of experience (or 2,000 hours of approved training) and passing a state examination.
Statutory Framework and Governing Authorities
Air conditioning and refrigeration contracting in the State of Texas is governed by Texas Occupations Code Chapter 1302 (the Air Conditioning and Refrigeration Contractor License Law) and administered by the Texas Department of Licensing and Regulation (TDLR) under rules codified in 16 Texas Administrative Code (TAC) Chapter 75. The primary purpose of this regulatory framework is to protect public health, safety, welfare, and consumer property by ensuring that individuals and businesses performing HVAC and refrigeration work meet rigorous competency, experience, and ethical standards.
TDLR works in consultation with the Air Conditioning and Refrigeration Contractors Advisory Board, an appointed body of industry experts, municipal inspectors, and consumer representatives that advises the Texas Commission of Licensing and Regulation on rule changes, exam content, and technical standards. Any person or business entity that designs, installs, constructs, maintains, services, repairs, alters, or modifies environmental air conditioning, commercial refrigeration, or process cooling and heating systems for compensation in Texas must hold an active license issued by TDLR or be registered/certified as a technician working under the direct supervision of a licensed contractor.
Contractor License Classifications: Class A vs Class B Scope
Texas issues two primary classes of contractor licenses based on system capacity limitations. Understanding the boundary between Class A and Class B licenses is critical for licensing exam candidates, as performing work beyond the scope of a license constitutes contracting without a license.
Class A License Scope
A Class A license entitles the contractor to engage in air conditioning and refrigeration contracting of unlimited capacity on any single unit or system. There are no tonnage limits on cooling equipment and no British Thermal Unit per hour (BTU/hr) limits on heating equipment. Class A contractors may service, design, install, and maintain the largest industrial chillers, multi-zone commercial rooftop packages, district cooling plants, and high-capacity heating systems.
Class B License Scope
A Class B license allows the contractor to engage in air conditioning and refrigeration contracting on equipment with strict capacity limits per single system or unit:
- Cooling Capacity Limit: Systems or units up to 25 tons of cooling capacity per single unit.
- Heating Capacity Limit: Systems or units up to 1,500,000 BTU/hr (1.5 million BTU/hr) of heat output or input per single unit.
Critical Exam Rule: The capacity thresholds for Class B licenses apply to each single equipment unit, not to the total building cumulative capacity. For example, a building requiring 100 tons of total cooling load that uses four separate 25-ton rooftop package units can legally be installed or serviced by a Class B contractor, because no individual unit exceeds 25 tons. However, if the facility utilizes a single 30-ton package unit or a 30-ton central chiller, only a Class A contractor may legally perform the work.
| License Class | Cooling Capacity Limit (per single unit) | Heating Capacity Limit (per single unit) | Typical Target Applications |
|---|---|---|---|
| Class A | Unlimited | Unlimited | Large commercial buildings, industrial plants, central chillers, high-capacity boilers |
| Class B | Up to 25 Tons | Up to 1,500,000 BTU/hr | Residential homes, light commercial stores, multi-family units, small offices |
License Endorsements
In addition to selecting a Class A or Class B classification, every Texas contractor license must carry one or more specialized endorsements that define the specific mechanical domain in which the licensee is qualified to work. Performing work outside the endorsed scope is a violation of TDLR rules.
1. Environmental Air Conditioning (Endorsement E)
Endorsement E covers equipment and systems utilized for environmental control of temperature, humidity, ventilation, and air cleanliness for human comfort in residential, commercial, or institutional structures. This includes central air conditioners, heat pumps, gas furnaces, electric strip heaters, evaporative coolers, ductwork, and environmental controls.
2. Commercial Refrigeration and Process Cooling or Heating (Endorsement R)
Endorsement R is a single, combined endorsement covering two kinds of work that candidates often mistake for separate credentials.
- Commercial refrigeration: equipment and systems used to cool, freeze, or store food, beverages, medicine, or perishable goods — walk-in coolers and freezers, reach-in display cases, supermarket multi-compressor rack systems, commercial ice machines, and refrigerated transport units.
- Process cooling or heating: specialized equipment used for industrial manufacturing processes, environmental testing, power generation, or data center equipment cooling, where the primary function is process control rather than human comfort.
Both scopes travel together on one endorsement. There is no way to hold process cooling work without also holding commercial refrigeration — they are the same endorsement, and TDLR writes it as code R.
Combination Endorsements
Contractors may take additional license examinations to qualify for combination endorsements. For example, a contractor holding a Class A license with the combined C endorsement (written in the license number as TACL/A/000000/C) is authorized to perform work of unlimited capacity across both comfort conditioning and commercial refrigeration systems.
| Endorsement | Code | Primary Equipment Scope |
|---|---|---|
| Environmental Air Conditioning | E | Comfort air conditioning, heat pumps, gas furnaces, ventilation, ductwork |
| Commercial Refrigeration and Process Cooling or Heating | R | Walk-in freezers, display cases, supermarket racks, ice makers, beverage coolers, industrial process chillers, manufacturing environmental chambers, oil coolers |
| Combined | C | Both of the above on one license |
Exam Trap: Texas defines only two endorsements, not three. Commercial refrigeration and process cooling or heating are a single endorsement (R) under Texas Occupations Code Sec. 1302.254 and 16 TAC Sec. 75.22 — there is no separate "process cooling" endorsement and no license number ends in "P". A contractor holding both endorsements carries code C.
Contractor License Applicant Requirements
To qualify to sit for the Texas ACR Contractor Licensing Examination, an applicant must meet rigorous background, experience, and educational standards established by TDLR.
Practical Experience Requirement
Applicants must document at least 48 months (4 years) of practical experience in air conditioning and refrigeration work within the 72 months (6 years) immediately preceding the date of application. This experience must be verified by a licensed ACR contractor or qualified supervisor and must demonstrate direct, hands-on mechanical work, installation, service, or supervision.
Educational Substitution Credit
TDLR allows candidates to substitute formal technical education for up to 24 months (2 years) of the required 48 months of practical experience:
- 24 Months Credit: Awarded for a four-year degree in air conditioning engineering, refrigeration engineering, or mechanical engineering.
- 12 Months Credit: Awarded for a two-year associate degree in air conditioning and refrigeration technology, or for completing 2,000 hours of on-the-job training in a registered apprenticeship program.
- 6 Months Credit: Awarded for completing a one-year certificate program in air conditioning and refrigeration technology.
Exam Trap: Each credit tier is tied to the length of the program, and it is easy to shift them by one step. A two-year associate degree is worth 12 months, not 24. Under Texas Occupations Code Sec. 1302.255 an applicant with a two-year associate degree still owes 36 months of documented practical experience toward the 48-month requirement.
- Remaining Experience: Regardless of educational credits, every applicant must document at least 24 months of actual, practical field experience under the direct supervision of a licensed contractor within the past 72 months.
ACR Technician Registration vs. Certification
Texas regulates non-contractor field personnel under a two-tiered technician structure: Registered ACR Technicians and Certified ACR Technicians. Both tiers must work under the supervision of a licensed ACR contractor.
Registered ACR Technician
A Registered ACR Technician is an entry-level designation. Any individual who assists a licensed contractor in performing ACR work must register with TDLR before performing any jobsite duties. Requirements include:
- Submitting a completed application and registration fee to TDLR.
- Passing a criminal history background check.
- No examination and no prior experience are required.
- Must perform work under the direct supervision of a licensed ACR contractor.
Certified ACR Technician
A Certified ACR Technician holds a higher credential that demonstrates verified field competence. Achieving certified technician status requires:
- Documenting at least 24 months of practical experience under the direct supervision of a licensed ACR contractor, OR completing a TDLR-approved 2,000-hour technician training program.
- Passing the state-administered Certified ACR Technician Examination covering mechanical codes, electrical safety, refrigerant handling, and system fundamentals.
- Maintaining annual renewal and complying with TDLR background standards.
| Qualification Element | Registered ACR Technician | Certified ACR Technician |
|---|---|---|
| State Examination Required? | No | Yes (Certified Technician Exam) |
| Prerequisite Experience | None (Entry-level) | 24 Months field work or 2,000-hr approved program |
| Supervision Requirement | Direct supervision by licensed contractor | Direct supervision by licensed contractor |
| Background Check | Required | Required |
| Career Status | Mandatory baseline registration | Advanced career credential demonstrating tested competence |
Under Texas Occupations Code Chapter 1302, what is the maximum equipment capacity allowed for a contractor holding a Class B license?
An applicant for a Texas ACR Contractor License has completed a 2-year Associate of Applied Science degree in Air Conditioning and Refrigeration Technology from an accredited college. How many months of practical field experience under a licensed contractor must the applicant still document within the past 72 months?
Which of the following is required for an individual to become a Certified ACR Technician in Texas, distinguishing them from a Registered ACR Technician?