A 20 Ton RTU (Roof Top Unit) is a type of HVAC (Heating, Ventilation, and Air Conditioning) system that is typically used in commercial and industrial buildings. It is a self-contained unit that is mounted on the roof of a building and provides both heating and cooling functions. The 20 Ton RTU is typically larger than residential units and is capable of providing a much higher cooling capacity. It is also more energy efficient than residential units, as it is designed to provide a more consistent temperature throughout the building. The 20 Ton RTU is also much quieter than residential units, as it is designed to operate at a lower decibel level. This makes it ideal for buildings that require a quieter environment, such as hospitals and schools. The 20 Ton RTU is also much more reliable than residential units, as it is designed to withstand the elements and provide a more consistent performance over time.