Lennox International Inc. (NYSE: LII) is an American company. Through its subsidiaries, it is a provider of climate control products for the heating, ventilation, air conditioning, and refrigeration markets around the world. The Company was founded in 1895, in Marshalltown, Iowa, by Dave Lennox, the owner of a machine repair business for railroads. He designed and patented a riveted steel coal-fired furnace, which led to numerous advancements in heating, cooling and climate control solutions. Today the company is focused on three core businesses: Residential Heating and Cooling, Commercial Heating and Cooling, and Refrigeration. The company headquarters are in Richardson, Texas, near Dallas.