Lennox International Inc., together with 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 internationally. It operates through 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.