This term is not used. Air Conditioning Contractors Vendors service, repair, sell, and install all brands. They often provide 24-hour service and free second opinions on replacement equipment. Vendors are usually licensed by the state and insured.
Some vendors provide duct cleaning and air cleaners.
Typically they service all brands. This term is not used. Air Quality Service Air testing, duct cleaning, and consulting. Appraisers Covers antiques, art, jewelry, silver, real estate, equipment. Includes an ad for the American Society of Appraisers.