A HVAC duct mixing box is an important component of a home’s heating, ventilation, and air conditioning (HVAC) system. It is a box that is connected to the ductwork of the HVAC system and is used to mix the air from different parts of the house. The mixing box takes in air from the return ducts and the supply ducts and mixes them together to create the desired temperature in the home. The mixing box also helps to reduce the noise of the HVAC system by mixing the air at a lower speed. The mixing box is usually installed in the attic or basement of the home and is connected to the ductwork of the HVAC system. The mixing box helps to ensure that the air in the home is at the desired temperature and that the air is evenly distributed throughout the home. The mixing box is an important part of the HVAC system and helps to keep the home comfortable and energy efficient.