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. Illustrative Examples: Cooling tower installation Heating, ventilation, and air-conditioning (HVAC) contractors Duct work (e.g., cooling, dust collection, exhaust, heating, ventilation) installation Lawn sprinkler system installation Fire sprinkler system installation Mechanical contractors Fireplace, natural gas, installation Refrigeration system (e.g., commercial, industrial, scientific) installation Furnace installation Sewer hookup and connection, building Establishments primarily engaged in--

Including:

• Air system balancing and testing
• Air vent installation
• Air-conditioning system (except window) installation
• Bathroom plumbing fixture and sanitary ware installation
• Blower or fan, cooling and dry heating, installation
• Boiler chipping, cleaning and scaling
• Boiler, heating, installation
• Central air-conditioning equipment installation
• Central cooling equipment and piping installation
• Central heating equipment and piping installation
• Chilled water system installation
• Chimney liner installation
• Commercial freezer installation
• Commercial refrigeration system installation
• Cooling tower installation
• Drain, waste and vent system installation
• Drinking fountain installation
• Dry heating equipment installation
• Duct work (e.g., cooling, dust collection, exhaust, heating, ventilation) installation
• Dust collecting and bag house equipment installation
• Exhaust system (e.g., kitchens, industrial work areas) installation
• Fire extinguisher installation
• Fire extinguisher installation and repair
• Fire sprinkler system installation
• Fireplace, natural gas, installation
• Fuel oil burner installation
• Furnace conversion (i.e., from one fuel to another)
• Furnace humidifier installation
• Furnace installation
• Furnace, forced air, installation
• Gas fitting contractor
• Gas line installation, individual hookup, contractors
• Heat pump installation
• Heating and cooling duct work installation
• Heating and ventilation system component (e.g., air registers, diffusers, filters, grilles, sound attenuators) installation
• Heating boiler installation
• Heating contractors
• Heating equipment installation
• Heating, ventilation and air-conditioning (HVAC) contractors
• Hot water heating system installation
• Hot water tank installation
• Household oil storage tank installation
• HVAC (heating, ventilation and air-conditioning) contractors
• Hydronic heating system installation
• Industrial process piping installation
• Kitchen sink and hardware installation
• Lawn sprinkler system installation
• Mechanical contractors
• Natural gas piping installation
• Oil burner installation
• Pipe fitting contractors
• Plumbers
• Plumbing and heating contractors
• Plumbing contractors
• Plumbing fixture installation
• Process piping installation
• Pumping system, water, installation
• Radiant floor heating equipment installation
• Refrigeration system (e.g., commercial, industrial, scientific) installation
• Sanitary ware installation
• Scrubber, air purification, installation
• Sewer hookup and connection, building
• Sheet metal duct work installation
• Snow melting system (e.g., hot water, glycol) installation
• Solar heating equipment installation
• Sprinkler system, building, installation
• Steam fitting contractors
• Sump pump installation
• Ventilating contractors
• Warehouse refrigeration system installation
• Warm air heating system installation
• Water heater installation
• Water meter installation
• Water softener installation
• Water system balancing and testing contractors
• Waterless fire suppression system installation
• Waterless fire suppression system installation and repair