A portable air conditioner costs a few hundred dollars and you can wheel it home today. A split system costs a few thousand and takes a week to organise. It looks like an easy decision until you understand what you actually get for the money.
The short answer
If you can fit a split system, fit a split system. A portable costs less up front and more of almost everything else: more to run, more noise, less cooling.
Portables earn their place in a narrow set of situations, covered below.
Why portables underperform
Portable air conditioners carry a zero-star energy efficiency rating. That is not a knock from us, it is how they rate under Australia’s energy labelling scheme.
There are two reasons:
- The whole machine is in the room with you. A split system puts the compressor and the hot condenser coil outside. A portable puts them inside, so it dumps a good part of the heat it removes straight back into the room before the hose can carry it out.
- The hose and the window gap leak. Venting the hose out a window means the window is partly open. Hot outside air flows back in, and the unit has to work harder still.
The result is that a portable uses more electricity to deliver less cooling, and it does so in the same room where you can hear its compressor.
Head to head
| Portable | Split system | |
|---|---|---|
| Purchase price | Roughly $300 to $1,100 | Roughly $1,500 to $5,000 supplied and installed |
| Installation | None | Licensed technician, usually one day |
| Energy rating | Zero stars | Star rated on the Zoned Energy Rating Label, so you can compare |
| Running cost | Highest per unit of cooling | Low, especially inverter models |
| Noise indoors | Compressor is in the room | Compressor is outside |
| Area cooled | Part of one room | A full room or open-plan area |
| Heating | Some models | Standard on reverse cycle models |
| Moves with you | Yes | No |
Cost figures are indicative only. We last reviewed them in October 2026.
When a portable is the right call
- You are renting and cannot fix anything to a wall or window, and your landlord will not agree to an installation
- You need it for a short period, such as one summer in a place you are about to leave
- The room genuinely cannot take anything else, for example a heritage-listed property where no external unit or wall penetration is permitted
- You need to move cooling between rooms at different times of day
In those cases a portable is better than nothing. Vent the hose out a window, seal around it as well as you can with a window kit, and expect it to struggle in a room much bigger than about 20 square metres.
Before you settle for a portable
Two options people overlook:
- A window or wall unit can often be fitted where a split cannot, and it is meaningfully more efficient and quieter than a portable. If there is an existing through-wall opening, it is also cheap. Read more about window and wall units
- A ceiling fan costs very little to run, around 2 cents an hour, and makes a room feel about 3 degrees cooler (energy.gov.au) while you are under it. It is not a substitute for air conditioning in real heat, but combined with a modest air conditioner it lets you set a higher temperature
If you are choosing a fitted system
A split system is the usual answer: one of the lowest installed costs of any fixed system, quiet indoors, cheap to run, and reverse cycle models heat as well as cool. Installation typically takes a day.
Note that only a technician holding a Refrigerant Handling Licence can install a split system, and a licensed electrician must do the electrical work. A portable comes pre-charged and sealed from the factory, so it needs neither.