This industry comprises establishments primarily engaged in the merchant wholesale distribution of refrigeration equipment (except household-type refrigerators, freezers, and air-conditioners). Merchant wholesale distribution of household-type refrigerators, freezers, and room air-conditioners--are classified in Industry 423620, Electrical and Electronic Appliance, Television, and Radio Set Merchant Wholesalers; and Merchant wholesale distribution of air-conditioning equipment (except room units)--are classified Industry 423730, Warm Air Heating and Air-Conditioning Equipment and Supplies Merchant Wholesalers.