Perform repair and/or replacement of A/C systems to include: window units and portable units installed by DPW, package units, split systems to include A/C systems that are installed in ventilation systems, A/C systems controls and humidifiers In the event of a power outage various systems may require manual restart. Maintains, repairs and replaces thermostatic expansion and pressure limited devices and valves, motors, compressors, starters, thermostats, piping, coils boiler burners, and other assorted HVAC system controls and components.