NAICS
23511: Plumbing, Heating, and Air-Conditioning Contractors
This industry comprises establishments primarily engaged in one or more
of the following: (1) installing plumbing, heating, and
air-conditioning equipment; (2) servicing plumbing, heating, and
air-conditioning equipment; and (3) the combined activity of selling
and installing plumbing, heating, and air-conditioning equipment. The
plumbing, heating, and air-conditioning work performed includes new
work, additions, alterations, and maintenance and repairs. The
activities performed by these establishments range from duct
fabrication and installation at the site to installation of
refrigeration equipment, installation of sprinkler systems, and
installation of environmental controls.
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