NAICS Code 423730 — Warm Air Heating and Air-Conditioning Equipment and Supplies Merchant Wholesalers

National Industry in the official 2022 North American Industry Classification System (U.S. Census Bureau). It is the only national industry under 42373 (Warm Air Heating and Air-Conditioning Equipment and Supplies Merchant Wholesalers).

Code	423730
Title	Warm Air Heating and Air-Conditioning Equipment and Supplies Merchant Wholesalers
Level	National Industry (6-digit)
Edition	NAICS 2022 edition
SBA size standard	175 employees

Official definition (2022 NAICS)

This industry comprises establishments primarily engaged in the merchant wholesale distribution of warm air heating and air-conditioning equipment and supplies.

Illustrative Examples:

Air pollution control equipment and supplies merchant wholesalers

Nonportable electric baseboard heaters merchant wholesalers

Air-conditioning equipment (except room units) merchant wholesalers

Warm air central heating equipment merchant wholesalers

Automotive air-conditioners merchant wholesalers

Ductless heating and air-conditioning system equipment merchant wholesalers

Is a business under 423730 "small"?

Under the SBA size standards (13 CFR 121.201, effective March 17, 2023), a business classified in NAICS 423730 qualifies as a small business if it does not exceed 175 employees. Small-business status determines eligibility for federal set-aside contracts, SAM.gov certifications and SBA loan programs — employee count is averaged over the latest 24 months.

Where 423730 sits in the hierarchy

Level	Code	Title
Sector	42	Wholesale Trade
Subsector	423	Merchant Wholesalers, Durable Goods
Industry Group	4237	Hardware, and Plumbing and Heating Equipment and Supplies Merchant Wholesalers
NAICS Industry	42373	Warm Air Heating and Air-Conditioning Equipment and Supplies Merchant Wholesalers
National Industry	423730	Warm Air Heating and Air-Conditioning Equipment and Supplies Merchant Wholesalers

Related SIC codes

Via the official U.S. Census concordance (1987 SIC ↔ NAICS), shown only where the industry definition is unchanged in NAICS 2022.

SIC code	Title
5075	Warm Air Heating and Air-Conditioning Equipment and Supplies

Data: official 2022 NAICS structure, descriptions and Census concordances, U.S. Census Bureau — U.S. government works in the public domain (17 U.S.C. §105). Suggested reference, not an official determination.