Clean, maintain and troubleshoot large capacity building HVAC systems including roof top equipment, air handlers, exhaust fans, fan coil units, and DX coil units, chiller, cooling towers, steam generators, air handler mixing boxes and other HVAC related equipment. -Performance of building maintenance tasks in one or more fields - plumbing, carpentry, electrical, HVAC (heating, ventilation, air conditioning) installs, services, modifies, rebuilds, and repairs building systems and equipment in an industrial or commercial establishment in accordance with applicable building codes and safety regulations.