What is a Ducted System?
A Ducted System is more expensive than a Wall Split, but unlike a Wall Split
(which can generally only service one room) Ducted Systems can do the entire
house or premises. They consist of an outdoor unit (or compressor or
condenser) located in convenient location outside the premises, which is
connected to an indoor unit via piping, generally installed in the roof. This, in
turn, outputs the conditioned air into various rooms via ducting.
The ducting used is generally flexible ducting, but metal sections
can also be fabricated where necessary. The air flows from the
indoor unit, through the ducting and is directed into the premises via
vents which can be mounted in the ceiling, in the walls or even be
floor-mounted, depending on the most effective possibility. See
the pictures of various types of vents below.
Ducted air conditioning performs like a regular air conditioner but
has several added benefits. When the unit is operating, air is
drawn in from various parts of the building through a return-air duct.
This air is pulled through a filter where airborne particles such as
dust and lint are removed. Sophisticated filters may remove microscopic
pollutants as well. The filtered air is routed to air supply ductwork
that carries it back to rooms. Whenever the air conditioner is running,
this cycle repeats continually.
Also, by being a split system, with the compressor located outside
the premises, it offers a lower level of indoor noise than a
free-standing air conditioning unit.
Ducted systems are generally zoned, which means that not all rooms
need to be air conditioned at all times. Groups of rooms can be
selected as a zone which can be isolated from the rest of the house,
resulting in more efficient operating costs. After all, if you're
not using a part of the house it doesn't make sense to condition the air
A diagram of how the ducting is generally laid out in a
residence. Note the outdoor unit in the centre of the wall on the
left hand side.