A 12.5 ton rooftop unit is a type of air conditioning system that is installed on the roof of a building. It is a self-contained unit that includes an evaporator, condenser, compressor, and other components necessary for cooling and heating. This type of unit is ideal for larger buildings that require a lot of cooling and heating power. The 12.5 ton unit is capable of providing up to 12.5 tons of cooling or heating power, which is enough to cool or heat a large building. It is also an energy-efficient option as it uses less energy than other types of air conditioning systems. The unit is easy to install and maintain, making it a popular choice for commercial and industrial buildings. Additionally, the unit is designed to withstand harsh weather conditions, making it a reliable and durable option.