HVAC Commissioning Technicians validate heating, ventilation, and air conditioning systems using testing tools, airflow measurement devices, and control systems. They perform functional testing, calibration, and troubleshooting. Responsibilities include system verification, performance testing, documentation, and reporting. Work environments include commercial buildings and construction sites. They follow HVAC standards and safety protocols. Their role ensures efficient climate control, system reliability, and energy optimization, making them essential in building services and energy systems globally.