North American Industry Classification System
NAICS 3334 is the four-digit subsector level, while 33341 is the five-digit industry group level — both cover the same broad HVAC and commercial refrigeration scope. The five-digit code is used for more granular production and shipment statistics, but for import classification, the relevant codes are the HTS tariff lines, not NAICS codes.
No. US import entries require Harmonized Tariff Schedule (HTS) codes, not NAICS codes. NAICS codes are used for domestic economic and statistical purposes. Importers must identify the correct 10-digit HTS number for each product to determine applicable duty rates and trade-remedy exposure.
Trade Directory
List your company and tag the 6-digit products you trade, so the companies trading them can find you. Be the first supplier listed.
NAICS industry 1 of 1 in industry group 3334 · 3 products
NAICS industry 33341 · $2.6B of $2.6B
Imports · August 2026
origin
Mexico and China together supply 55% of it. China pays 26.7% duty; Italy 3.2%.
customs district
Census does not publish district detail for this classification system.
destination
Census publishes state breakdowns for NAICS to the 4-digit level only. See NAICS 3334 for those.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$2.6BYoY · free account
Exports
$871.5MYoY · free account
Low of 8 reported months · imports
Low · free accountThrough August 2026 · imports 8 of 12 months reported, exports 8 of 12 months reported. Source: U.S. Census Bureau.