What's the NAICS code for HVAC work?
HVAC work is 238220, Plumbing, Heating, and Air-Conditioning Contractors. The Census index lists HVAC contractors, air-conditioning installation and duct work there. Repairing commercial refrigeration equipment without installing it is 811310, and duct cleaning is 561790.
The codes, side by side
| Code | What the Census index lists | Small business size limit | New federal contracts and orders, FY2026 | Of those, under $250,000 |
|---|---|---|---|---|
| 238220 Plumbing, Heating, and Air-Conditioning Contractors | Heating, ventilation and air-conditioning (HVAC) contractors, duct work installation | $19.0 million | 2,751 | 2,231 |
| 811310 Commercial and Industrial Machinery and Equipment Repair and Maintenance | Commercial refrigeration equipment repair and maintenance services | $12.5 million | 2,722 | 2,481 |
| 561790 Other Services to Buildings and Dwellings | Duct cleaning services | $9.0 million | 387 | 364 |
Size limits are average annual revenue over the last five years, from the SBA table. Contract counts are from USAspending.gov, October 2025 to September 2026.
Agencies spread HVAC work across codes. Of the new FY2026 contracts and orders that mention HVAC, about a third were coded 238220. Many of the rest were under 561210 and 236220.
Other codes worth listing
- 561210 Facilities Support Services ($47.0 million): HVAC upkeep as part of a whole-facility maintenance contract.
- 238210 Electrical Contractors ($19.0 million): if you also handle controls, wiring or generators.
- 236220 Commercial and Institutional Building Construction ($45.0 million): larger HVAC replacements bought as building projects.
Agencies don't always code the same work the same way, so listing every code that fits gets more bids in front of you. Our guide to which NAICS codes to list explains how.
Common questions
What is the NAICS code for HVAC?
238220, Plumbing, Heating, and Air-Conditioning Contractors. Its size limit is $19.0 million in average annual revenue.
What NAICS code is HVAC repair and maintenance?
Usually 238220, which the Census index lists for HVAC contractors. Repair of commercial refrigeration equipment on its own is 811310.
See the open bids under these codes
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Sources
- Census Bureau: 2022 NAICS index
- 13 CFR 121.201: SBA size standards
- USAspending.gov: contract awards, FY2026 (pulled Nov 2, 2026)
How we get our numbers: our sources and methods.