SIC for "hvac"
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1711 - Plumbing, Heating and Air-Conditioning
Special trade contractors primarily engaged in plumbing, heating, air-conditioning, and similar work. Sheet metal work performed by plumbing, heating, and air-conditioning contractors in conjunction with the installation of plumbing, heating, and air-conditioning equipment is included here. …Examples: Air system balancing and testing - contractors, Air-conditioning, with or without sheet metal work - contractors, -
1796 - Installation or Erection of Building Equipment, Not Elsewhere Classified
Special trade contractors primarily engaged in the installation or erection of building equipment, not elsewhere classified, such as elevators, pneumatic tube systems, and dust collecting equipment. This industry also includes contractors primarily engaged in the installation or dismantling of machinery or other industrial equipment. …Examples: Conveyor system installation - contractors, Dismantling of machinery and other industrial equipment - contractors,