Other common titles: Service Technician, Building Engineer, heating, ventilation, air conditioning, refrigeration, cool, heat, air handlers, VAV, split systems, RTU, roof top unit, refrigerant, walk in coolers, coils, commercial, building, facility, facilities, retail, high rise, building automation system, BAS, BMS. Implement preventive maintenance programs to ensure that building machinery and systems meet or exceed their rated life; oversee repairs and emergency maintenance as needed.