A 20 ton HVAC unit is a type of heating, ventilation, and air conditioning (HVAC) system that is designed to cool and heat large spaces. It is usually used in commercial buildings and other large spaces, such as factories, warehouses, and shopping malls. A 20 ton HVAC unit is capable of providing 20 tons of cooling or heating power, which is equal to 240,000 BTUs (British Thermal Units) per hour. This makes it a powerful and efficient system that can handle large areas with ease. It is important to note that the size of the unit is not the only factor that determines its efficiency; the quality of the components, installation, and maintenance are also important. With proper installation and maintenance, a 20 ton HVAC unit can provide years of reliable service.