A heat coil for an air handler is a device that is used to heat air as it passes through an air handling system. It is typically made up of a series of metal coils that are heated by either electricity or gas. The heated coils transfer heat to the air as it passes through, raising the temperature of the air. Heat coils are commonly used in air handlers for both residential and commercial applications. They are used to provide heat to a space, to help reduce humidity levels, and to help maintain a comfortable temperature. Heat coils are also used in air handlers to help reduce the amount of energy used by the system, as they are more efficient than other heating methods. Heat coils are a cost-effective and efficient way to heat air in an air handling system, and they are a great choice for both residential and commercial applications.