The United Mechanical Service Department is one of the largest providers of preventive maintenance, repair, retrofit, replacement, and modernization services for commercial and industrial HVAC systems throughout the Northern California. Our highly skilled group of technicians and mechanics are equipped to ensure the safety, energy efficiency, reliability, and asset value of your HVAC systems.

We employ state-of-the-art diagnostic tools, service tools, dispatching systems, mobile technology, and a fully stocked service fleet to deliver you unmatched speed of response, 24 hours a day, 365 days a year.


  • Rapid response emergency service 24/7/365.
  • Your own dedicated account manager whose job is to ensure United Mechanical delivers on its promise of service excellence.
  • Expert preventive maintenance services that are designed to maintain maximum system uptime and energy efficiency.
  • In-house engineering services and project management teams for larger projects.
  • Specialized expertise in predictive failure analysis, energy optimization, DDC controls, chillers, boilers, VRF and other DX split and packaged systems, data center and other mission critical cooling systems, cooling towers and fluid coolers, water source heat pumps, variable speed drives, fans, and pumping systems.



We service some of the most high profile and technical facilities in the Bay Area. These include data centers, research labs, electronics manufacturing, higher education facilities, industrial plants, office campuses, and bio-pharmaceutical facilities.



For 24/7 HVAC Service Call
866-SERV-UMI or 408.228.1913