From Consumer Wiki
Repair or installation of central air conditioning units in homes, apartments, or condos requires licensing by the Contractors State License Board (CSLB).CSLB licenses and regulates contractors in 42 license classifications, investigates complaints against contractors, and works to eliminate unlicensed contractors working in California.
Contractor's State License Board
9821 Business Park Drive
Sacramento, CA 95827
(800) 321-2752 (24-hour licensing/consumer info)
PO BOX 26000
Sacramento, CA 95826
The Bureau of Electronic and Appliance Repair and Home Furnishings and Thermal Insulation provides safe guards to consumers for the repair, service, or maintenance of room air conditioners, among other electronic and major home appliances.
Bureau of Electronic and Appliance Repair and Home Furnishings and Thermal Insulation
3485 Orange Grove Avenue
North Highlands, CA 95660
(916) 574-2120 Fax
As of January 1, 1992, all repair shops servicing auto air conditioning systems must use either refrigerant recovery/recycle equipment or recovery only equipment approved by Environmental Protection Agency (EPA). Technicians who repair or service auto air conditioning services must be trained and certified by an EPA approved organization.
United States Environmental Protection Agency
75 Hawthorne Street
San Francisco, CA 94105
Bureau of Automotive Repair (BAR)
Publications available: DCA's Guide to Electronic and Appliance Repair BEAR Fact Sheet on "Service Contracts"