Assist in testing, commissioning of HVAC systems (AHU, FCU, Chillers, DX units, Ventilation systems). Support senior technicians during site activities and inspections. Carry out troubleshooting of HVAC equipment under supervision. Perform ducting, piping, insulation, and equipment checks as per drawings and specifications. Ensure tools and instruments are used properly and safely. Follow site safety rules and company procedures at all times. Prepare basic site reports and assist in documentation.