As used in this article and the legislative rules promulgated pursuant to this article:

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(a) “Perform work on a heating, ventilating, and cooling system” means to install, maintain, alter, remodel, or repair one or more components of a heating, ventilating, and cooling system.

(b) “Heating, ventilating, and cooling system” means equipment to heat, cool, or ventilate residential or commercial structures, comprised of one or more of the following components:

(1) “Heating system” means a system in which heat is transmitted by radiation, conduction, or convection, or a combination of any of these methods, to the air, surrounding surfaces, or both, and includes a forced air system that uses air being moved by mechanical means to transmit heat, but does not include a fireplace or wood-burning stove not incorporated into or used as a primary heating system;

(2) “Ventilating system” means the natural or mechanical process of supplying air to, or removing air from, any space whether the air is conditioned or not conditioned, at a rate of airflow of more than 250 cubic feet per minute; and

(3) “Cooling system” means a system in which heat is removed from air, surrounding surfaces, or both, and includes an air-conditioning system.

(c) “HVAC Technician” means a person with at least 2,000 hours of HVAC-related work, training, and experience and is licensed to install, test, maintain, and repair both residential and nonresidential heating, ventilating, and cooling systems.

(d) “HVAC Residential Technician” means a person licensed to install, test, maintain, and repair residential heating, ventilating, and cooling systems: Provided, That such persons may perform work on nonresidential heating, ventilating, and cooling systems subject to rules promulgated by the commissioner pursuant to § 21-16-3 of this code.

(e) “Residential heating, ventilating, and cooling system” means a system of no more than four separate heating, ventilating, and cooling units each with a combined capacity of five tons – 130,000 BTUs for: (1) A single or dual family structure; or (2) a commercial location of no more than 5,000 square feet in size where no fire damper is required. Such term shall not apply to heating, ventilating, and cooling systems that include any packaged rooftop units.

(f) “HVAC technician in training” means a person with less than 2,000 hours of HVAC-related work, training, and experience: Provided, That the fee for an HVAC technician in training license may not be higher than $25.00.

(g) “HVAC residential technician license” means a valid and current license issued by the Commissioner of Labor in accordance with the provisions of this article to perform work as an HVAC residential technician.

(h) “HVAC technician license” means a valid and current license issued by the Commissioner of Labor in accordance with the provisions of this article to perform work as an HVAC technician.

(i) “Routine maintenance” means work performed on a routine schedule that includes cleaning and/or replacing filters, greasing or lubricating motor bearings, adjusting and/or replacing belts, checking system temperature, checking gas temperature, adjusting gas pressure as required, and checking voltage and amperage draw on heating, ventilating, and cooling systems.

(j) “Single family dwelling” means a building that is occupied as, or designed or intended for occupancy as, a single residence for one or more persons.