California Association of Sheet Metal and Air Conditioning Contractors (CAL-SMACNA)
- A non-profit trade association representing union sheet metal and air conditioning contractors in California. Trade news, members directory, and an events calendar are provided.
- http://www.cal-smacna.org/

Air Conditioning & Mechanical Contractors Association of Queensland (AMCA-Q)
- Representing the interests of its members in their chosen field of business within Queensland, Australia. Seeks to improve the flow of information about the industry to non-members, the general public and government.
- http://www.amcaqld.com.au/

Sheet Metal and Air Conditioning Contractors' National Association (SMACNA)
- An international trade association representing 4,500 contributing contractor firms, that promotes quality and excellence in the sheet metal and air conditioning industry within North America. Provides a list of members, benefits, news and resources.
- http://www.smacna.org/