A HVAC duct temperature sensor is a device that is used to measure the temperature of air that is passing through a duct in a heating, ventilation, and air conditioning (HVAC) system. It is an important component of an HVAC system, as it helps to ensure that the air being circulated is at the right temperature for the space it is being used in. The sensor is typically placed in the duct and measures the temperature of the air passing through it. It then sends a signal to the HVAC system, which adjusts the temperature accordingly. The sensor can also be used to detect changes in the temperature of the air, which can help to prevent the system from overheating or freezing. HVAC duct temperature sensors are an essential part of any HVAC system, as they help to ensure that the air being circulated is at the right temperature for the space it is being used in. They are also important for ensuring that the system is running efficiently and safely, as they can detect any changes in the temperature of the air and alert the system to make any necessary adjustments.