Return ducts are an essential part of a heating, ventilation, and air conditioning HVAC system. They are responsible for carrying air from the living spaces back to the HVAC unit. This process helps maintain balanced air pressure and ensures that the system can efficiently heat or cool the home. These ducts are typically located in various rooms and are connected to the main return air plenum. By drawing in air, return ducts help filter and circulate it, improving indoor air quality and comfort. Properly sized and placed return ducts are crucial for the overall effectiveness of the HVAC system.