A senior HVAC technician job description includes installing, maintaining, and repairing complex heating, ventilation, and air conditioning (HVAC) systems. Key responsibilities involve diagnosing mechanical and electrical faults, performing preventative maintenance, conducting technical inspections, documenting work and safety compliance, and providing on-the-job training and technical guidance to junior staff. This role requires advanced expertise, strong troubleshooting skills, and the ability to work independently and as part of a team, often under physically demanding conditions.