1.2 License Classifications & Capacity Limitations

1.2 License Classifications & Capacity Limitations

[!IMPORTANT] Statutory Scope Alignment: Under A.C.A. § 17-33-303 and 17 CAR § 261-103, HVAC/R contractor licenses in Arkansas are strictly categorized by equipment capacity, thermodynamic limits, and trade specialization. Performing mechanical work outside the authorized scope of a contractor's specific license classification constitutes unlicensed contracting under the law, exposing the licensee to formal disciplinary action, license suspension, and civil monetary penalties.

The Arkansas licensing system recognizes that mechanical contracting spans an expansive technical continuum, ranging from light residential split-system replacements to complex district chilled water plants, industrial ammonia refrigeration systems, and specialized sheet metal duct fabrication. To align contractor qualifications with public safety risks, Arkansas delineates five current license classifications: Class A, Class B, Class D, Class E, and Class L.

[!WARNING] Act 746 of 2025 changed this list — and most study material has not caught up. Two changes matter on exam day:

1. Class C was repealed. Arkansas previously issued a sixth class (Class C, a service-and-repair-only license capped at 15 tons). Act 746 of 2025 eliminated it, and existing active Class C holders were converted to Class B licenses by the state. There is no longer a Class C license to apply for.
2. The Class B cooling ceiling rose from 15 tons to 25 tons per unit in 17 CAR § 261-103(b)(1).

Prov's candidate information bulletin, the printed HVAC/R Law booklet, and virtually every third-party licensing website still show the superseded 15-ton Class B figure and still list a Class C exam. When a source conflicts with the current rule, 17 CAR § 261-103 controls. Note that Class L was not changed and remains capped at 15 tons.

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Class A: Unlimited HVAC/R Contractor License

The Class A Contractor License represents the highest, unrestricted tier of mechanical contracting qualification in Arkansas. It grants comprehensive statutory authority to bid, engineer, install, alter, repair, service, and maintain all forms of environmental comfort conditioning and mechanical refrigeration systems without limitation.

Operational Scope and Capacity

• Cooling Capacity: Unlimited tonnage (e.g., fractional-ton mini-splits up to thousand-ton centrifugal chillers).
• Heating Capacity: Unlimited British Thermal Units per hour (BTU/hr) input (e.g., residential gas furnaces up to high-pressure industrial hydronic steam boilers).
• Refrigeration Capacity: Unlimited compressor drive horsepower (HP).
• Sheet Metal Scope: Fully authorized to fabricate, assemble, hang, and test all sheet metal and non-metallic air distribution ductwork systems.
• Facility Jurisdictions: Authorized across all residential, commercial, institutional, high-rise, and industrial facilities.

A Class A contractor is qualified to execute complex central plant installations, built-up variable air volume (VAV) systems, industrial process piping, cleanroom environmental controls, and district cooling loops.

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Class B: Limited HVAC/R Contractor License

The Class B Contractor License is the standard credential utilized by residential and light-commercial mechanical contractors. It establishes defined, statutory capacity limits designed to safely govern residential and light-commercial installations while precluding uncertified work on heavy commercial or industrial central plants.

Statutory Capacity Ceilings

Under 17 CAR § 261-103(b)(1) (as amended by Act 746 of 2025), a Class B contractor is restricted to equipment not exceeding the following per-unit thresholds:

1. Air Conditioning & Cooling: Up to 25 tons (300,000 BTU/hr) cooling capacity per individual unit.
2. Heating Equipment: Up to 1,000,000 BTU/hr (1.0 MMBTUH) heat input rating per individual unit.
3. Refrigeration Systems: Up to 15 horsepower (HP) drive or compressor rating per individual unit.

Class B is not limited to "hanging boxes." Under 17 CAR § 261-103(b)(2), a Class B license includes the authorization to install an HVAC/R appliance and to perform HVAC/R electrical work and HVAC/R fuel gas fitting work within those capacity limits — the same ancillary authority a Class A holder carries under § 261-103(a)(2).

The "Per-Unit" Statutory Rule

A foundational distinction tested on the Arkansas examination is that Class B capacity limits apply per individual unit / piece of equipment, rather than to the cumulative load of the entire building or project.

[!TIP] Per-Unit Sizing Rule in Practice:

• Compliant Class B Project: A commercial office building requires 80 tons of total cooling capacity. The mechanical design specifies four (4) independent 20-ton packaged rooftop units (RTUs). Because each individual unit operates at 20 tons (below the 25-ton statutory ceiling), a Class B contractor can legally bid, permit, and install the entire 80-ton system.
• Non-Compliant Class B Project: A retail facility requires 30 tons of total cooling capacity served by a single 30-ton packaged rooftop unit. Even though the total building load is substantially smaller than the 80-ton office building, a Class B contractor is legally prohibited from contracting or installing this system because the single unit exceeds the 25-ton statutory limit. This installation strictly requires a Class A contractor.

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Class D: Sheet Metal Ductwork Contractor License

The Class D License is a specialized trade credential designed for sheet metal fabrication and duct installation specialists. It governs the structural air distribution infrastructure that conveys conditioned air from heating and cooling appliances throughout occupied spaces.

Allowable Scope of Practice

• Fabrication, assembly, erection, and installation of galvanized sheet metal, stainless steel, and aluminum ductwork.
• Installation of flexible air ducts, fiberglass duct board, and pre-insulated non-metallic air ducts compliant with UL 181 standards.
• Installation of supply air diffusers, return air grilles, linear slot registers, fire dampers, smoke dampers, and volume balancing dampers.
• Installation of external duct thermal insulation, internal acoustical duct liners, and vapor retarders.

Strict Statutory Prohibitions

Class D contractors are strictly prohibited from performing any mechanical, electrical, or refrigeration work. Under Arkansas law, a Class D licensee must never:

• Sell, set, hang, or install packaged mechanical units, condensers, evaporators, furnaces, or heat pumps.
• Cut, flare, braze, evacuate, charge, or service refrigerant piping circuits.
• Connect, disconnect, or alter electrical high-voltage or low-voltage control wiring.
• Connect, test, or alter fuel gas supply piping or combustion venting flues.

17 CAR § 261-103(c)(1)(B) states this affirmatively: unlike Class A, B, and E, the Class D license does not include authorization to install an HVAC/R appliance for conditioning air for human comfort, nor to perform HVAC/R electrical work or fuel gas supply work.

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Class E: Refrigeration Contractor License

The Class E License governs specialized commercial and industrial mechanical refrigeration systems used for cold storage, food preservation, processing plants, and scientific environmental control.

Allowable Scope and Capacity

• Refrigeration Capacity: Unlimited compressor horsepower (HP).
• Permitted Equipment: Commercial walk-in coolers, walk-in freezers, supermarket multiplex parallel rack systems, meat processing chillers, blast freezers, refrigerated display cases, and industrial ice-making machinery.
• Refrigerants Handled: Halocarbon systems (HFC, HFO), carbon dioxide (R-744), and ammonia (R-717) industrial systems.
• Ancillary Authority: Under 17 CAR § 261-103(d)(1)(B), a Class E license may include HVAC/R electrical work and fuel gas work to the appliance being installed — so a refrigeration contractor can land the power and gas connections on the rack or process appliance itself.

Express Statutory Prohibitions

Class E licensees are specialized refrigeration mechanics and are strictly prohibited from engaging in comfort heating or comfort air conditioning work. A Class E contractor cannot:

• Install, service, or alter residential or commercial comfort cooling air conditioning systems (split systems, RTUs, VRF).
• Install, service, or repair gas furnaces, electric heat strips, heat pumps, or hydronic heating systems.
• If a commercial facility (such as a grocery store) requires both walk-in refrigeration racks and rooftop comfort air conditioning units, the Class E contractor may only work on the refrigeration rack system. The comfort cooling equipment must be installed by a Class A or Class B contractor.

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Class L: Lifetime HVAC/R License

The Class L License is an honorary and practical regulatory category established to recognize senior mechanical tradespeople who have dedicated their careers to the Arkansas HVAC/R industry.

Statutory Eligibility Criteria

Class L is created by A.C.A. § 17-33-303(a)(6) and defined by 17 CAR § 261-103(e). (A.C.A. § 17-33-304 is a different section entirely — Display of license number.) There are only two eligibility tests, and there is no minimum years-of-licensure requirement:

1. The applicant must be at least sixty-five (65) years of age.
2. The applicant must hold a current license in good standing with the Board. The Board's rule states the same test as prior eligibility for a Class A, B, D, or E license.

[!CAUTION] Do not invent a service-length requirement. Arkansas imposes no "10 years," "12 years," or "20 years" of prior licensure for Class L. Distractors on this question typically pair the correct age (65) with a fabricated tenure figure. Age plus a current license in good standing is the entire test.

Scope of Practice and Restrictions

Class L carries its own hard capacity ceilings written into 17 CAR § 261-103(e)(1) — it does not simply inherit the limits of whatever class the holder used to carry. This is the single most-missed detail about the lifetime license:

• Cooling: not more than 15 tons cooling capacity per unit.
• Heating: not more than 1,000,000 BTUH heating input per unit.
• Refrigeration: 15 horsepower or less per unit.
• Allowable Scope: service and maintenance work only on systems within those limits.
• Express Prohibition: under § 261-103(e)(2), a lifetime license holder shall not install any original equipment or replace any existing HVAC/R equipment.
• No Registrants: under § 261-103(e)(3), a lifetime license holder shall not employ registrants to perform HVAC/R work. A Class L holder is a working solo tradesperson, not a staffed contracting firm.
• Fee-Exempt Status: the Class L license fee is "No Charge" under the Board's fee schedule (A.C.A. § 17-33-204(b)).

Note the consequence of these limits: a retiring Class A contractor who converts to Class L does not keep unlimited tonnage. They drop to the 15-ton / 1,000,000 BTUH / 15 h.p. service-only envelope.

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Master Comparison Matrix: License Classifications, Limits & Scopes

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Realistic Trade Scenarios & Code Interpretations

Scenario 1: The Supermarket Mechanical Contract

A new grocery store in Jonesboro, Arkansas, issues construction drawings featuring two distinct mechanical scopes:

1. A 120 HP parallel compressor rack running R-448A to power twenty walk-in coolers, freezers, and refrigerated retail cases.
2. Three 15-ton rooftop packaged heat pumps providing comfort heating and cooling for the sales floor and management offices.

Licensing Compliance:

• A Class A contractor possesses legal authority to bid and perform the entire contract (both the refrigeration rack and the rooftop heat pumps).
• A Class E contractor can legally contract and install the 120 HP refrigeration rack, but cannot touch the rooftop heat pumps.
• A Class B contractor can legally contract and install the three 15-ton rooftop heat pumps (since each is <= 25 tons), but cannot touch the 120 HP refrigeration rack (exceeds the 15 HP limit).

Scenario 2: The Church Sanctuary HVAC Upgrade

A church in Hot Springs plans to replace its failed cooling equipment. The mechanical engineer designs a single 27.5-ton split-system condensing unit connected to a matching air handler.

A local Class B contractor submits a bid, arguing that they have installed systems with over 100 tons of capacity across apartment complexes. Can the Class B contractor legally execute this project?

Statutory Determination: No. Even though the contractor has extensive cumulative experience, the proposed system utilizes a single 27.5-ton unit. Because 27.5 tons exceeds the statutory Class B ceiling of 25 tons per unit, performing this installation constitutes unlicensed Class A contracting. The church must award the contract to an actively licensed Class A contractor.

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Common Exam Traps on Operating Scopes

• Exam Trap: Class B Capacity Boundaries: Memorize the exact triad for Class B under the current rule: 25 tons cooling, 1,000,000 BTU/hr heating, and 15 horsepower refrigeration, all per unit. Exams and older prep books frequently swap these figures — the most common distractor is the pre-2025 15-ton cooling number, which is now the Class L figure, not the Class B figure.
• Exam Trap: Class D Touching Equipment: Watch for questions where a sheet metal contractor is asked to disconnect a package unit to install a new roof curb. A Class D contractor cannot disconnect, rig, set, or reconnect the mechanical equipment—only the duct transition.
• Exam Trap: Class L Installing Equipment: The exam frequently tests whether a 68-year-old contractor holding a Class L license can replace an air conditioner for a family member. Under 17 CAR § 261-103(e)(2), a lifetime license holder shall not install any original equipment or replace any existing HVAC/R equipment, regardless of relationship or project size. "Replace" is expressly named, so swapping a failed condenser is prohibited even though it feels like service work.