Lennox International is an American company that designs, manufactures, and markets HVAC equipment and services. The company's products include air conditioners, furnaces, heat pumps, packaged units, air handlers, and indoor air quality equipment. Lennox International was founded in 1895 and is headquartered in Richardson, Texas. The company operates in North America, Europe, and Asia. Lennox International is listed on the New York Stock Exchange (NYSE) and is a component of the S&P 500.