What is the definition of a mini split with ducted air handler? A mini split air handler is a type of air conditioning system that uses two separate units for cooling and heating. The first unit is an outdoor condensing unit which is connected to an indoor air handler, also known as a ducted air handler. The air handler is installed in the ceiling and is connected to the outdoor unit using refrigerant lines and electrical wiring. The air handler is responsible for delivering cooled or heated air to the desired area. It is also responsible for removing stale air from the room and exhausting it outside. The indoor air handler can be set to different temperatures and can be used to control the temperature in multiple rooms. This type of system is an energy efficient and cost effective way to heat and cool a home or office. It is also relatively easy to install and maintain.