A 15 ton HVAC unit is a type of heating, ventilation, and air conditioning (HVAC) system that is designed to provide cooling and heating for larger commercial and industrial buildings. This type of unit is capable of providing 15 tons of cooling or heating capacity, which is enough to service a large area. The unit is usually composed of several components, including an outdoor condenser, an indoor evaporator, and a compressor. The condenser and evaporator are responsible for transferring heat from the inside of the building to the outside, while the compressor is responsible for compressing the refrigerant and allowing it to flow through the system. In addition, the unit also includes a variety of other components, such as a fan, a thermostat, and ductwork. All of these components work together to provide efficient cooling and heating for the building.