Other Common Titles: HVAC Service Technician, Commercial Service Technician, Heating and Air Conditioning Technician, Heating and Cooling Technician, Service Technician, Refrigeration Technician, HVAC Mechanic, HVAC Apprentice, Heating, ventilation, air conditioning, and refrigeration, HVAC Specialist. Install, repair, adjust, service and maintain electric or pneumatic control systems used for building heating, ventilation, air conditioning, and refrigeration systems and equipment, including calibration of related instruments, gauges, and control components.