Responsibility Area: Maintenance Duties: Operate, maintain, install, and perform preventive maintenance on all types of heating, air conditioning, and refrigeration equipment including large commercial air handlers, boilers, chillers, pumps, generators, AC split systems, air compressors, and other related equipment. Operate, maintain, install, and perform preventive maintenance on all types of heating, air conditioning, and refrigeration equipment including large commercial air handlers, boilers, chillers, pumps, generators, AC split systems, air compressors, and other related equipment.