A mini-split and a ductless HVAC system are two terms used interchangeably to describe the same type of heating and cooling system. They both refer to a type of air conditioning system that does not require ductwork to distribute cooled or heated air throughout a building. Mini-splits or ductless HVAC systems consist of two main components: an outdoor compressor unit and one or more indoor air-handling units. The outdoor unit is connected to the indoor units by a conduit that contains refrigerant lines, a power cable, and a drain line. The indoor units are typically mounted high on a wall or ceiling and blow cool or warm air into the room. Therefore, the terms mini-split and ductless HVAC system refer to the same type of heating and cooling system, and the terms can be used interchangeably.