(1) No firm, company, or corporation may engage in the practice of heating, ventilation, and air conditioning contracting in any county of the Commonwealth, unless the person in responsible charge of the heating, ventilation, and air conditioning work is a master heating, ventilation, and air conditioning contractor and is an employee or subcontractor of the firm, company, or corporation.
(2) Each master heating, ventilation, and air conditioning contractor who is employed by a firm, company, or corporation engaged in the practice of heating, ventilation, and air conditioning contracting shall notify the department of that employment and upon termination of the employment.
(3) No master heating, ventilation, and air conditioning contractor shall represent more than one (1) firm, company, or corporation unless the contractor is domiciled in the Commonwealth and has a minimum of twenty-five percent (25%) ownership in each firm, company, or corporation the contractor represents.