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

This industry comprises establishments primarily engaged in installing and servicing plumbing, heating, and air-conditioning equipment. Contractors in this industry may provide both parts and labor when performing work. The work performed may include new work, additions, alterations, maintenance, and repairs.

Cooling tower installationHeating, ventilation, and air-conditioning (HVAC) contractorsDuct work (e.g., cooling, dust collection, exhaust, heating, ventilation) installation+7 examples

Lawn sprinkler system installationFire sprinkler system installationMechanical contractorsFireplace, natural gas, installationRefrigeration system (e.g., commercial, industrial, scientific) installationFurnace installationSewer hookup and connection, building

Also called: plumber, plumbing, HVAC

Matching SIC code: 1796 Installation or Erection of Building Equipment, Not Elsewhere (also 1711 Plumbing, Heating and Air-Conditioning, 1791 Structural Steel Erection)

Where it sits

23ConstructionSector
238Specialty Trade ContractorsSubsector
2382Building Equipment ContractorsIndustry group
23822Plumbing, Heating, and Air-Conditioning ContractorsNAICS industry
238220Plumbing, Heating, and Air-Conditioning ContractorsNational industry

Largest companies with NAICS 238220

Updated Nov 9, 2026

Rank	Company	Headquarters	Employees
1	Southland Industriessouthlandind.com	Garden Grove, US	4.8K
2	Roto-Rooter Plumbing and Drain Servicerotorooter.com	Cincinnati, US	4.5K
3	Legencewearelegence.com	San Jose, US	3.8K
4	RK Industriesrkindustries.com	Aurora, US	3.8K
5	EMCOR Group, Inc.emcorgroup.com	Norwalk, US	3.4K
6	ACCO Engineered Systemsaccoes.com	Pasadena, US	2.8K
7	McKinstrymckinstry.com	Seattle, US	2.3K
8	TDIndustries, Inc.tdindustries.com	Dallas, US	2.1K
9	American Residential Servicesars.com	Memphis, US	2K
10	Harrisharriscompany.com	Saint Paul, US	1.9K

Not this code?

Similar activities the Census classifies elsewhere.

561790Other Services to Buildings and DwellingsDuct cleaning
238910Site Preparation ContractorsInstalling septic tanks and systems
237110Water and Sewer Line and Related Structures ConstructionWater well drilling (except water intake wells in oil and gas fields) and water well pump and piping system installation
811310Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and MaintenanceRepair and maintenance of commercial refrigeration equipment or fire extinguisher and waterless fire suppression systems, without installation

Questions about NAICS 238220

What is the NAICS code for plumber?

NAICS 238220, Plumbing, Heating, and Air-Conditioning Contractors. This industry comprises establishments primarily engaged in installing and servicing plumbing, heating, and air-conditioning equipment.

Which businesses use NAICS 238220?

Cooling tower installation, lawn sprinkler system installation and fire sprinkler system installation, and similar businesses in the Construction sector.

What SIC code matches NAICS 238220?

SIC 1796, Installation or Erection of Building Equipment, Not Elsewhere; SIC 1711, Plumbing, Heating and Air-Conditioning; SIC 1791, Structural Steel Erection, from the US Census Bureau's concordance between the two systems.

How many companies have NAICS 238220?

58,348 companies with a website carry NAICS 238220 as their primary code in Crustdata's data, worldwide.

Find any company's NAICS codeType a company name or website and get its codes with their titles.

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Code titles, definitions, examples and SIC matches: NAICS 2022 and the Census concordances, US Census Bureau. Company counts and lists: Crustdata, companies with a website, each by its primary code, updated weekly. Employee counts are estimates.