lennox international inc., through its subsidiaries, designs, manufactures, and markets a range of products for the heating, ventilation, air conditioning, and refrigeration markets in the united states, canada, and europe. the company operates in three segments: residential heating & cooling, commercial heating & cooling, and refrigeration. the residential heating & cooling segment provides furnaces, air conditioners, heat pumps, packaged heating and cooling systems, indoor air quality equipment and accessories, comfort control products, and replacement parts and supplies for residential replacement and new construction markets. the commercial heating & cooling segment offers unitary heating and air conditioning equipment, applied systems, controls, installation and service of commercial heating and cooling equipment, and variable refrigerant flow commercial products for light commercial markets, as well as rooftop units, split system/air handler combinations, and variable refrigerant