A DDC controller is a type of device used to monitor and control the performance of a building’s HVAC (heating, ventilation, and air conditioning) system. It is an electronic device that is connected to the HVAC system and allows the user to set and monitor the temperature, humidity, and other environmental conditions within the building. The controller is typically programmed to maintain the desired temperature and humidity levels, as well as other parameters such as air flow, air pressure, and air quality. It can also be used to monitor energy consumption and provide energy-saving solutions. The controller is usually connected to a computer or other network device to allow remote access and monitoring. DDC controllers are typically used in commercial buildings, such as office buildings, hotels, and hospitals, but can also be used in residential buildings. They are designed to be easy to use and provide a high level of control over the HVAC system. With a DDC controller, users can easily adjust the temperature and humidity levels to suit their needs, while also reducing energy consumption and ensuring the building’s environment is comfortable and safe.