- 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 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 hook-up 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
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