Possible NAICS Codes
561210 – Facilities Support Services
238220 – Plumbing, Heating, and Air-Conditioning Contractors
333414 – Heating Equipment (except Warm Air Furnaces) Manufacturing
221310 – Water Supply and Irrigation Systems
333415 – Air-Conditioning and Warm Air Heating Equipment and Commercial and Industrial Refrigeration Equipment Manufacturing
561320 – Temporary Help Services
541330 – Engineering Services
811219 – Other Electronic and Precision Equipment Repair and Maintenance
561790 – Other Services to Buildings and Dwellings
541611 – Administrative Management and General Management Consulting Services