Natural Gas Distribution, Water Supply and Irrigation Systems, Sewage Treatment Facilities, Steam and Air-Conditioning Supply, New Single-Family Housing Construction (except Operative Builders)

Other Electric Power Generation, Steam and Air-Conditioning Supply

Steam and Air-Conditioning Supply, Plumbing, Heating, and Air-Conditioning Contractors, Automatic Environmental Control Manufacturing for Residential, Commercial, and Appliance Use

Steam and Air-Conditioning Supply, Plumbing, Heating, and Air-Conditioning Contractors, Sheet Metal Work Manufacturing, Power Boiler and Heat Exchanger Manufacturing, Industrial and Commercial Fan and Blower Manufacturing

Electric Power Distribution, Natural Gas Distribution, Steam and Air-Conditioning Supply, Electrical Contractors

Fossil Fuel Electric Power Generation, Electric Power Distribution, Water Supply and Irrigation Systems, Sewage Treatment Facilities, Steam and Air-Conditioning Supply

Steam and Air-Conditioning Supply, Power Boiler and Heat Exchanger Manufacturing, Industrial Valve Manufacturing, Other Metal Valve and Pipe Fitting Manufacturing, Heating Equipment (except Warm Air Furnaces) Manufacturing