A commercial air handler is a large, industrial-grade unit that is used to control the temperature and humidity of a space. It is typically used in commercial buildings, such as office buildings, warehouses, and factories. The air handler works by circulating air through the space and controlling the temperature and humidity levels. It is made up of several components, including a blower, a filter, and a heat exchanger. The blower pulls air from the outside and circulates it through the space, while the filter removes dust and other particles from the air. The heat exchanger is used to heat or cool the air, depending on the desired temperature. The air handler also has controls that allow the user to adjust the temperature and humidity levels. The air handler is an important part of any commercial building, as it helps to maintain a comfortable environment for employees and customers.