United Technologies Corporation provides high-technology products and services to the building systems and aerospace industries worldwide. UTC's products include Otis, Carrier, Pratt & Whitney, and Sikorksy. Otis is an elevator and escalator manufacturing, installation and service company. Carrier is a manufacturer and distributor of commercial and residential heating, ventilating and air conditioning (HVAC) systems and refrigeration and equipment. UTC Fire & Security (formerly Chubb and Kidde) is a global provider of security and fire protection products and services. Pratt & Whitney manufactures and services aircraft engines and other commercial and government aerospace and defense products. Sikorsky produces military and civil helicopters. In addition, UTC Power manufactures fuel cells for commercial, transportation and space applications.