This industry comprises establishments primarily engaged in providing steam, heated air, or cooled air. The steam distribution may be through mains.
Selling and installing warm air heating and air-conditioning equipment--are classified in Industry 238220, Plumbing, Heating, and Air-Conditioning Contractors; and Merchant wholesale distribution of warm air heating and air-conditioning equipment--are classified in Industry 423730, Warm Air Heating and Air-Conditioning Equipment and Supplies Merchant Wholesalers.