This means that you'll be able to search for NAICS codes directly (if that's your jam). We'll do the math; let's make better data on public procurement together.
Possible NAICS Codes
221330 – Steam and Air-Conditioning Supply
926130 – Regulation and Administration of Communications, Electric, Gas, and Other Utilities
459510 – Used Merchandise Retailers
333415 – Air-Conditioning and Warm Air Heating Equipment and Commercial and Industrial Refrigeration Equipment Manufacturing