This industry comprises establishments primarily engaged in installing and servicing plumbing, heating, and air-conditioning equipment. Contractors in this industry may provide both parts and labor when performing work. The work performed may include new work, additions, alterations, maintenance, and repairs.

Cross-References. Establishments primarily engaged in--

Installing electrical controls for HVAC systems--are classified in Industry 238210, Electrical Contractors and Other Wiring Installation Contractors;

Duct cleaning--are classified in Industry 561790, Other Services to Buildings and Dwellings; and

Installing septic tanks--are classified in Industry 238910, Site Preparation Contractors.