How to Choose a Split System

A split system is a refrigerative form of air conditioner whose components are split into two parts – the indoor and outdoor unit working together linked with pair coil to transfer cooled or warmed refrigerant. The indoor unit is seen mounted on the wall, and the outside unit contains the coil and fan. They are a perfect solution to flexibility and convenience for single room climate control.


Split systems tend to be fairly quiet and can be easily installed and is also convenient to operate, more often than not using a remote control.

Being reverse cycle, all splits offered on our website can provide heating or cooling.

In the market at the moment, there are many brands, sizes, energy ratings, output capacity, etc and we are here to help you decide which is the ideal solution for you and your family. Remember, a split system is designed for 1 room.

It is a simple and affordable way to air condition single rooms or open areas. They’re also great for regulating the temperature of larger rooms such as a lounge room or master bedroom.

    • They are energy and noise efficient.
    • They are affordable to buy and install.
    • Start with 1 unit, and add more if you like later on, as you can add on more units when the need arises which provides flexibility.
    • Each unit has a simple remote control which allows completely different temperature settings for each room.


There are many factors in play when it comes to choosing a suitable Split System for your home. They are:


How do you calculate the right size split system?

Size does matter when it comes to air conditioners. You don’t want to choose a system too small – it won’t be able to cool or warm a room properly.

At the same time, don’t get a system too powerful for the room size. It will likely be turning itself on and off, which will increase wear on the unit and decrease its service life. Fundamentally, for every 10 square metres (sqm) of space, you will need a split system air conditioner with around 1-1.5 kilowatts of cooling capacity. Then there are also other factors which are equally important and can affect the performance of your split system air conditioner such as: 

    • Ceiling height.
    • Insulated ceiling/walls.
    • Location and size of windows and the direction they face.
    • The climate you are living in.
    • Does the sun hit the room a lot, and are there other activities that could warm up the room more than normal?

This table is only a rough estimate as to matching the air conditioning to your room size:

Room Size
Cooling (C)/Heating (H)
3.0m x 3.0m = 9m2 2.5KW(C)/3.2KW(H)
5.0m x 5.0m = 25m2 3.5kw(C)/3.7KW - 4.3KW (H)
5.5m x 5.5m = 30m2 3.5kw(c)/3.7KW(H) - 5.0KW(C)/6.0KW(H)
6.3m x 6.3m = 40m2 5.0KW(C)/6.0KW(H) - 6.0KW(C)/7.2KW(H)
6.7m x 6.7m = 45m2 6.0KW(C)/7.2KW(H) - 7.1KW(C)/8.0KW(H)
7.1m x 7.1m = 50m2 7.1KW(C)/8.0KW(H) - 8.0KW(C)/9.0KW(H)
7.7m x 7.7m = 55m2 8.0KW(C)/9.0KW(H) - 9.2KW(C)/10.0KW(H)


This table is a rough guide only, and before making a decision you should consult with a suitably qualified air conditioning installer to ensure you are getting the right size system for your room. Polyaire makes no guarantee this table is free from errors.

What features do you want to consider? What will be useful for you?

Compare features available between models on our product pages when you shop split systems.


A useful feature to switch on your unit before you even arrive home from work and switch off at night to save on electricity while you’re asleep.

Humidity Control

Particularly useful if you live in a tropical climate or suffer from respiratory problems; to regulate the amount of moisture in the air.

Remote Control

Enables you to switch your split system air conditioner on or off as well as adjust the temperature without needing to physically move.

Sleep Mode 

A feature which can alter your unit temperature to suit your needs while you are asleep.

Reverse Cycle

Provides the option of heating and cooling so you’ll get to enjoy a warm temperature during winter and a cool environment during summer.

Air Purifier

Great for those who suffer from asthma or allergies; this feature uses a filtration system to clear the air of harmful pollutants such as fine dust, dust mite debris, smoke particles or bacteria to create a cleaner and more comfortable environment within the home.

Fan Speed

You can choose from a variety of fan speeds to suit your specific needs.

Odour Removing Function

Removes the smell of mildew from damp homes, as well as other unpleasant odours such as cigarette smoke or pet odours.

Eco Mode

Uses intelligent technology to only use as much power as is needed at any given time.