A Carrier 12.5 Ton Package Unit is a self-contained air conditioning system designed to provide cooling and heating for large commercial and industrial buildings. This type of unit is typically mounted on the roof of the building and is designed to be an all-in-one solution for the cooling and heating needs of the building. The unit contains a condenser, evaporator, compressor, and other components that work together to provide efficient and reliable cooling and heating. The Carrier 12.5 Ton Package Unit is designed to be a cost-effective solution for large commercial and industrial buildings. It is also designed to be energy efficient, reducing energy costs for the building. The unit is also designed to be low maintenance, requiring minimal service and maintenance. The Carrier 12.5 Ton Package Unit is a great solution for large commercial and industrial buildings looking for an efficient and reliable cooling and heating system.