An HVAC subcontractor is a specialized professional hired by a general contractor to handle heating, ventilation, and air conditioning (HVAC) work on a project. They typically install, repair, and maintain HVAC systems in residential, commercial, or industrial buildings. Unlike direct employees, subcontractors operate as independent businesses, managing their own schedules, equipment, and compliance with regulations. Their responsibilities may include ductwork installation, troubleshooting systems, and ensuring energy efficiency.