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