A DX cooling coil is a type of heat exchanger that is used to cool air or other gases. It is typically used in air conditioning systems, and is composed of a series of metal tubes or coils that are filled with a refrigerant. As air passes over the coils, the refrigerant absorbs the heat from the air, cooling it down. The cooled air is then circulated through the system, providing a comfortable environment. DX cooling coils are highly efficient and are able to cool air quickly and efficiently. They are also relatively easy to install and maintain, making them a popular choice for many air conditioning systems. In addition, they are also relatively inexpensive, making them a cost-effective solution for cooling needs.