NAICS 2022 nationalIndustry USA Verified: Census NAICS 2022 · 2026-01-01

NAICS 238220 — Plumbing, Heating, and Air-Conditioning Contractors

Plumbing, Heating, and Air-Conditioning Contractors

NAICS 238220 is the national industry code for plumbing, heating, and air-conditioning contractors establishments in the United States. The Small Business Administration sets a size standard of $19.0 for this classification. It forms part of the hierarchical North American Industry Classification System maintained by the Census Bureau.

SBA: $19.0 View full SBA standard

Exclusions & Cross-References

Activities classified under other official NAICS codes:

duct cleaning (See 561791 Duct and chimney cleaning services (CAN))
installing electrical controls for HVAC systems (See 238210 Electrical contractors and other wiring installation contractors)
masonry fireplaces installation (See 238140 Masonry contractors (US))
water well pumps and well piping systems installation (See 237110 Water and sewer line and related structures construction (US))

Official Illustrative Examples

Primary activities officially recognized by Census Bureau / Statistics Canada:

air-conditioning systems, installation or repair duct work (e.g., heating, cooling, exhaust, dust collection), installation furnace conversion from one fuel to another heating, ventilation, and air conditioning (HVAC ) contractors industrial process piping installation installation of cooling towers and other industrial or commercial cooling equipment natural gas piping, installation sprinkler systems, lawn and garden, installation water heater installation

Complete Index of Activities (66 recognized activities) ▼

air system balancing and testing

air vents, installation

air-conditioning systems, installation or repair

bathroom plumbing fixtures and sanitary ware, installation

blowers and fans, cooling and dry heating, installation

boiler chipping, cleaning and scaling

central air-conditioning equipment, installation

central cooling equipment and piping, installation

chilled water systems, installation

commercial refrigeration systems, installation

diffusers, grilles, air registers, installation

domestic oil storage tanks, installation

drain, waste and vent systems, installation

drinking fountains, installation

dry heating equipment and controls, installation (except electric baseboard)

duct work (e.g., heating, cooling, exhaust, dust collection), installation

dust collecting equipment installation, contractors

exhaust systems contractor (e.g., kitchens, industrial work areas)

fire sprinkler systems, installation

fireplace installations (except masonry)

fireplace, natural gas, installation

forced air furnaces, installation

fuel oil burner, installation

furnace and oil burner controls, installation

furnace conversion from one fuel to another

furnace humidifiers, installation

furnace installation, maintenance and repair

gas fitting contractor

gas line hookup, contractors

heat pump installation

heating boiler (i.e., household), installation and repair

heating boiler installation and repair

heating equipment installation, contractors

heating, ventilation, and air conditioning (HVAC ) contractors

hot water heating systems, installation

hydronic heating systems, installation

industrial process piping installation

installation of cooling towers and other industrial or commercial cooling equipment

kitchen sinks and hardware, installation

lawn sprinkler system installation, contractors

mechanical contractors

metal chimney liner installation, for oil to gas conversions, wood burning fireplace inserts

natural gas piping, installation

pipe fitting contractors, plumbing and heating

plumbing and heating contractors

plumbing contractors (plumber)

plumbing fixtures, installation

potable water systems (except water well), installation

radiant floor heating equipment, installation

scrubbers (i.e., for air-purification) installation

sewer hook-ups and connections for buildings, contractors

snow melting systems (hot water or glycol), installation

solar heating plant installation

sprinkler systems, lawn and garden, installation

steam fitting contractors

sump pump installation and servicing, contractors

tinsmiths, duct work, construction

ventilating work, contractors

warehouse refrigeration, installation

warm air heating systems, installation

water heater installation

water meters, installation

water piping systems (except water well), installation

water pump installation and servicing, contractors

water softeners, installation

water system balancing and testing, contractors

Official data

Feature	Description
Official name	North American Industry Classification System (NAICS) 2022
Issuing authority	U.S. Census Bureau with OMB, Statistics Canada, and INEGI
Tax authority	Internal Revenue Service (IRS)
Purpose	Statistical business classification and federal contracting (SAM.gov, SBA standards)
Used in	SAM.gov registration, SBA size determinations, IRS tax classification, SEC EDGAR (via SIC crosswalk)
Active since	2022 (current edition)
Hierarchy level	Sector (2-digit)
Source	https://www.census.gov/naics/