Description: 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 Cross-References. Establishments primarily engaged in--