Legence Corp. provides engineering, installation, and maintenance services for mission-critical building systems in the United States. It operates in two segments: Engineering & Consulting, and Installation & Maintenance. The Engineering & Consulting segment designs HVAC and other MEP systems, develops strategies to reduce energy usage and improve building sustainability, and provides program and project management for client installation and retrofit projects. The Installation & Maintenance segment fabricates and installs HVAC, process piping, and other MEP systems in new and existing industrial, commercial, and institutional buildings, and offers preventative and corrective maintenance, emergency repair, break-fix services, and facility energy analysis, automation, optimization, and system certification and testing. It serves data centers, technology, life sciences, healthcare, education, mixed-use, state and local government, and other markets. The company was founded in 1914 and is based in San Jose, California.