The Australian Refrigeration Council (ARC) provides an online licence check.
The search requires you to enter both the surname of the holder as well as the licence number.
ARC licenses technicians that perform refrigeration and air conditioning work. Those not operating with a current licence may be doing so illegally.
Licence Checks are Australia-wide. A business search is also available that allows you to find authorised businesses by location. Enter a postcode and they type of business you require. The search covers home and car air conditioning, home fridges and freezers, refrigerant recovery and commercial services.
This scheme operates under the Ozone Protection and Synthetic Greenhouse Gas Management Act 1989.