What is an air handler?
The air handler is a device that moves the air in your house. It is usually located in the garage, attic or a closet of the house. The major components enclosed in an air handler's cabinetry are the blower and motor, controls, heater compartment, and an evaporator coil.
This is why it is also sometimes referred to as a fan coil. A standard air handler delivers the same amount of airflow no matter what the temperature inside. A variable-speed air handler has a variable-speed motor that allows the coil to cool down quickly and the blower to slowly ramp up and ramp down. This provides greater
humidity control, quieter operation, maximum air circulation, temperature distribution, and air
filtration for greater control of your home's indoor environment.