United Technologies Corporation provides technology products and services to the building systems and aerospace industries worldwide. The company’s Otis segment designs, manufactures, sells, and installs elevators, escalators, and moving walkways. Its Carrier segment manufactures and distributes residential, commercial, and industrial HVAC and refrigeration systems and equipment; food service equipment; building automation and controls; and HVAC and refrigeration components, as well as provides retrofit and aftermarket services. The company’s UTC Fire and Security segment offers fire and special hazard detection and suppression systems, and fire fighting equipment; electronic security, monitoring, and rapid response systems; and service and security personnel services. Its Pratt and Whitney segment provides commercial, general aviation, and military aircraft engines; parts and services; industrial gas turbines; and space propulsion systems. The company’s Hamilton Sundstrand segment offers aerospace products and aftermarket services, including power generation, management, and distribution systems; flight, engine control, environmental control, fire protection and detection, and auxiliary power units and propeller systems, as well as industrial products, including air compressors, metering pumps, and fluid handling equipment. This segment also offers aftermarket services, such as spare parts, overhaul and repair, engineering and technical support, and fleet maintenance programs. Its Sikorsky segment provides military and commercial helicopters, aftermarket helicopter, and aircraft parts and services. United Technologies Corporation also engages in the development and marketing of distributed generation power systems and fuel cell power plants for stationary, transportation, space, and defense applications. The company was founded in 1934 and is based in Hartford, Connecticut.