The following words and terms have the following meanings as used in this chapter:(1) Act--Texas Occupations Code, Chapter 1302, Air Conditioning and Refrigeration Contractors.(2) Advertising or Advertisement--Any commercial message which promotes the services of an air conditioning and refrigeration contractor.(3) Air conditioning and refrigeration subcontractor--A person or firm who contracts with a licensed air conditioning contractor for a portion of work requiring a license under the Act. The subcontractor contracts to perform a task according to his own methods, and is subject to the contractor's control only as to the end product or final result of his work.(4) Air conditioning or heating unit--A stand-alone system with its own controls that conditions the air for a specific space and does not require a connection to other equipment, piping, or ductwork in order to function.(5) Assumed name--As defined in the Business and Commerce Code,