Perform scheduled in-depth preventative maintenance and service/repair of HVAC mechanical systems and sub-systems,, pneumatic and DDC control systems, air-handling evaporation systems, chillers, rooftop equip., split systems, window units, heating/cooling water circulation systems, relater fans, piping, pumps, and other components. Communicates with technicians, schedulers and material coordinators throughout the maintenance and repair processes to include scheduling the service, providing cost estimates, informing the customer of unexpected repairs and determining customer satisfaction.