United Technologies Corporation (UTC) is a provider of technology products and services to the building systems and aerospace industries. It manufactures, sells, and installs passenger and freight elevators, escalators, and moving walkways. The company provides HVAC, refrigeration, fire, security, and building automation products, solutions, and services, as well as supplies aircraft engines for the commercial, military, business jet, and general aviation markets. UTC merged with Raytheon to form Raytheon Technologies.