United Maintenance Inc. is a mechanical contracting firm with more than 35 years of experience. Based in Atlanta, Ga., the firm specializes in providing commercial as well as industrial air conditioning controls and process piping facilities. It offers services for chillers, boilers and cooling towers, air handling unites and duct systems. Additionally, the mechanical contracting firm offers a host of designing, installation and maintenance services for pharmaceuticals, industrial, commercial, municipal and government markets. United Maintenance Inc. features a preventive maintenance contract facility.