Lennox International, Inc. engages in the design, manufacture, and marketing of products for heating, ventilation, air conditioning, and refrigeration. It operates through the following business segments: Residential Heating & Cooling, Commercial Heating & Cooling, and Refrigeration. The Residential Heating & Cooling segment manufactures and markets furnaces, air conditioners, heat pumps, packaged heating and cooling systems, equipment, and accessories. The Commercial Heating & Cooling segment sells unitary heating and cooling equipment used in light commercial applications. The Refrigeration segment includes retails equipment for commercial refrigeration market including condensing unit, unit coolers, fluid, coolers, air cooled condensers, supermarket display cases, and systems. The company was founded by Dave Lennox in 1895 and is headquartered in Richardson, TX.