Direct Digital Control (DDC) HVAC is a type of control system that is used to regulate the temperature and humidity of a building. It is an automated system that is designed to monitor and control the heating, ventilation, and air conditioning (HVAC) systems in a building. The system uses sensors to monitor the temperature and humidity levels in the building and then sends signals to the HVAC system to adjust the temperature and humidity accordingly. This allows for a more efficient and comfortable environment for the occupants of the building. The system also allows for the building to be more energy efficient as it can adjust the temperature and humidity levels to reduce energy consumption. DDC HVAC systems are becoming increasingly popular in commercial and residential buildings as they provide a more efficient and comfortable environment for the occupants.