An HVAC contractor is a trained professional responsible for installing, maintaining, and repairing heating, ventilation, and air conditioning systems in residential, commercial, and industrial buildings. They are skilled in assessing the cooling and heating needs of a space, recommending the appropriate equipment, and ensuring that it is installed correctly. Additionally, HVAC contractors possess the knowledge and expertise to troubleshoot and fix any issues that may arise with these systems, ensuring optimal performance and energy efficiency for their clients.