The most common air conditioners in Australia, split systems have two main units. The outdoor unit expels “waste” air, and the indoor unit expels “conditioned” air, which either heats or cools the room. Most modern systems are “reverse cycle”, so they do both, meaning they produce both hot air and cool air depending on the settings you choose. Split systems are generally cheaper and easier to install, and rather than just one unit, multiple units can also be installed across a property and controlled independently depending on the users’ requirements. Having independent systems also means you can control how and when you use each unit, which can help reduce your power bills.
Ducted air conditioners are more expensive to install, but in the long run, they can be an efficient solution for larger homes and commercial buildings that require heating and cooling across multiple spaces. Ducted systems have an outdoor and an indoor unit, but indoors, they are constructed of a series of ducts inside the roof cavity. These circulate air through vents into the spaces that need heating and cooling (known as “zones”). Ducted systems are generally quieter, less aesthetically intrusive and offer a more extensive heating and cooling alternative.