HVAC: Troubleshoot and repair heating and cooling equipment, including boilers, furnaces, rooftop and split systems, PTAC units, thermostats, and controls; handle refrigerant work and seasonal changeovers. Plumbing: Diagnose and repair leaks, drain and sewer line issues, water heaters, pumps, valves, and fixtures; respond quickly to water-related emergencies to protect residents and property.