Diagnose, repair, and maintain HVAC and refrigeration equipment including large/small HVAC supply and return air handling units, energy recovery ventilators, exhaust fans, unit heaters, fan coil units, hydronic pumps, air compressors, control air dehydration and filtering systems, forced air heating/cooling units, boilers, chillers, piping systems, other mechanical devices and related electronic interfaces. Install, maintain, program, repair, and trouble-shoot a variety of Building Automation Controls and other specialized equipment for electronic monitoring, network communication, measuring and overall operation of building automation system controllers, extension modules, network automation engines and a variety of different types of controls hardware across multiple operating system platforms from different manufactures and protocols.