United Technologies (UTC) has the worldwide industrial expertise to lift you up and cool you down. Its Otis, UTC Climate Controls & Security, and Pratt & Whitney segments develop technologies, systems, and services for the aerospace, construction, and security industries. Climate Controls & Security makes alarms, monitoring equipment, surveillance and access control systems, and fire and hazard detection products. Otis is the world's largest elevator and escalator manufacturing company, while Pratt & Whitney makes commercial and military engines. UTC Aerospace Systems produces engine controls and flight systems for military and commercial clients.