Ducted air conditioning runs cool air from a central unit in the loft into one or multiple rooms on the same floor of a house. It has its limitations, but can be a great solution for those wanting to cool and heat several rooms with minimal drilling, disruption and cost. The air is released and drawn from the rooms by small ducts and sometimes grills.
Simple ducts in ceilings and walls
This can be a great way to control the summer heat in bedrooms. It allows for a neat and simple installation with less holes and pipework in walls compared to wall mounted units.
Central and external units
The first 2 images show the central unit in a loft space, and the last an external unit. There is often greater flexibility with the placement of the external unit in a ducted system.