Ducted split systems

Ducted split systems or perhaps more simply "ducted air conditioning" works by having a central location where the air is treated, then sent by fans through a system of ducts into each room. Ducted air conditioning is more expensive to install due to the cost of running the ducting but is a better solution than split systems where multiple rooms or large areas are involved. Ducted air conditioners are also quieter than split systems because all the motors are outside of the house or in the ceiling. Ducted air conditioning can be zoned. Zoning allows different people in different rooms to dial in different temperatures. Zoning also improves efficiency by turning of zones that are not currently in use.

Although ducted systems tend to cost more upfront, they are generally more efficient at cooling large areas than split systems. Ducted systems tend to be more aesthetically pleasing. Inside the house, a ducted system is almost invisible. The only way you will know it’s there is if you see the vents or the controller on the wall.

Most units sold are "reverse cycle". Reverse cycle is an air conditioner in which the refrigeration cycle can be reversed, producing heating instead of cooling. It's really two systems in one that work in a most efficient way together. When the reverse cycle unit is in cooling mode, it works like a normal air conditioner.