Many finished HVAC and refrigeration units, as well as key components such as compressors and heat exchangers, sourced from China are subject to Section 301 tariffs. Importers should verify the specific HTS classification of each product to determine applicable trade-remedy exposure before entry.

For assembled HVAC equipment, origin is typically determined by the 'substantial transformation' standard — the country where the product undergoes its most significant manufacturing process. Because many units combine components from multiple countries, importers should work with a licensed customs broker to document origin accurately and avoid misclassification penalties.