Multi-split air conditioning in Traralgon
Multi-split air conditioner in Traralgon: one outdoor unit running two to four indoor heads, when it suits a house, pipe runs, guide cost and the trade-offs.
A multi-split air conditioner in Traralgon is one outdoor unit piped to two or more indoor heads, each in its own room with its own remote. It suits a house where you want heating and cooling in a few rooms, there is little or no roof space for ducts, and there is only one sensible place outside for a condenser. Independent installers in the area quote multi-split jobs through this site; you deal with the business that takes the enquiry, and it prices the work after seeing the house.
What is a multi-split, and how is it different from other systems?
The Victorian Energy Upgrades consumer factsheet from Energy Victoria describes three types of reverse cycle system:
| Type | How the factsheet describes it | Usually suits |
|---|---|---|
| Single split | One outdoor unit connected to one indoor unit | A single room or open plan area |
| Multi-split | One outdoor unit connected to multiple indoor units | Multiple rooms or the whole home |
| Ducted | One central outdoor unit connected to multiple rooms through ducts and vents | The whole home |
You can read the definitions in the VEU space heating and cooling factsheet. For a fuller side by side of the main system types, see ducted vs split systems.
When does a multi-split suit a Latrobe Valley house?
These are the situations where installers tend to suggest one:
- Two to four rooms need heating and cooling. A lounge and the main bedroom, or a lounge, a study and two bedrooms.
- No roof space, or a difficult one. Flat or skillion roofs, cathedral ceilings and low pitched roofs can make ducts hard or impossible to fit.
- Limited outside wall space. A narrow side path, a boundary wall or a small courtyard may only have room for one outdoor unit.
- Looks matter. Some owners would rather see one condenser on the wall than three or four in a row.
- Replacing a gas room heater and adding cooling to bedrooms at the same time. The gas to electric heating page covers the switching job in more detail.
If you only want one room done, a single split is simpler and cheaper; see split system installation, which also has the room sizing table. If you want every room heated and the roof space is good, compare it with ducted reverse cycle air conditioning.
What are the trade-offs of one outdoor unit?
A multi-split saves wall space, but it puts every room on one machine.
| Benefit | Drawback |
|---|---|
| One condenser outside instead of several | If the outdoor unit fails, every head stops at once |
| Fewer holes and less pipe cover on the outside walls | Longer pipe runs to the furthest heads |
| Each room has its own head and remote | Heads usually have to run in the same mode, heating or cooling, at one time on many models |
| Can be cheaper than several separate splits where pipe runs are short | Adding a head later is only possible if the outdoor unit has a spare port and capacity |
The shared mode point matters in this climate less than you might think: on a July evening, with Bureau of Meteorology averages for Latrobe Valley Airport showing a mean minimum of 3.7 C, every room wants heat. It matters more in spring and autumn, when a sunny west bedroom may want cooling while the lounge wants warmth. Ask the installer how the model they propose handles that.
How are the indoor heads sized?
Each head is sized to the room it serves, not to the whole house. A small bedroom needs a smaller head than an open plan living area. The outdoor unit then has to be big enough for the heads it supplies. A careful installer measures each room, asks about insulation and window size, and sets out the capacity for every head in the quote.
How long can the pipe runs be?
Every head needs its own pair of refrigerant pipes, a drain line and a control cable back to the outdoor unit. Manufacturers set a maximum length for each run and for the total, plus a maximum height difference between the outdoor unit and the highest or lowest head. A head on the far side of the house, or upstairs, may be close to those limits.
Pipes can run through the roof space, under the floor, or along outside walls inside a pipe cover. Each route has costs: roof and under-floor runs need access, outside runs need cover and look busier. Ask the installer to mark the route for each head on a sketch or photo of the house.
Where should the outdoor unit go?
Because one condenser does all the work, its position matters more than it would for a single split. The Energy Victoria factsheet notes that outdoor units need good air circulation, so a cramped side path boxed in by a fence and a water tank is a poor spot. A few other points installers weigh up:
- Distance to the heads. A central spot on the house keeps the longest pipe run shorter.
- Noise. The unit runs whenever any head is on, so keep it away from your own bedroom windows and the neighbour’s.
- Drainage and frost. In heating mode the outdoor coil makes water as it defrosts. On a Latrobe Valley winter morning that water needs somewhere to go, not a path where it can freeze.
- Service access. A technician has to reach the unit and its valves, so do not wall it in behind a deck or a screen.
- Mounting. Ground pads are easier to service than high wall brackets, but they need a clear, level patch.
What does a multi-split cost?
The Melbourne guide range for a multi-split system with two indoor heads, installed, is $4,200 to $7,900; to see a local figure for your rooms, price a two or three head multi-split. Systems with three or four heads cost more, because the outdoor unit is larger and there is more pipe, cable and labour. These are Melbourne metro guide ranges including GST, and a business working in Traralgon and the surrounding towns may quote differently.
The things that push the price up:
- More heads, or larger heads in big rooms
- Long or difficult pipe routes, especially to upstairs rooms
- A switchboard that needs work before the system can be connected
- Removal of old heaters or units
- A high or awkward wall for the outdoor unit
Does a multi-split qualify for the VEU discount?
Victorian Energy Upgrades has a household discount category for replacing a ducted gas heater with a multi-split system, as well as room system categories. The product must be approved and installed through an accredited provider, and the discount appears in their quote. The VEU heating discounts guide explains how it works.
What will a careful installer check?
Before quoting a multi-split, a careful installer will:
- Measure each room and work out a heating and cooling capacity for every head
- Find a spot for the outdoor unit with good air circulation, clear of bedroom windows and the neighbour’s fence where noise may be an issue
- Plan the pipe route to each head and check it is within the manufacturer’s limits
- Check the switchboard and whether a dedicated circuit is needed
- Confirm the drain from each head runs downhill to a suitable point
Installation needs a refrigerant handling licence from the Australian Refrigeration Council, and the electrical connection needs a licensed electrician. A careful installer will not mount a head where its drain cannot fall, and will not stretch a pipe run past the manufacturer’s limit to save moving the outdoor unit.
Next step: map out the rooms
To ask for a multi-split quote, include:
- Which rooms you want heads in, with rough sizes in metres
- Whether the house has roof space, a crawl space under the floor, or neither
- Where you think the outdoor unit could go
- Photos of the outside wall where it might sit, and of each room’s best wall for a head
- Your suburb, and any existing heater you want removed
With that, an installer can tell you whether a multi-split suits the house before coming out to measure.
Frequently asked questions
- How many indoor heads can one multi-split outdoor unit run?
That depends on the model. Common domestic systems run two to four heads, and some larger units run more. The total capacity of the heads also has to suit the outdoor unit. The installer will check the manufacturer's limits for the model they quote.
- Is a multi-split cheaper to run than several separate split systems?
Not necessarily. Running costs depend on the efficiency rating of each system, how well the house is insulated and how many rooms you heat at once. Ask the installer for the heating and cooling efficiency figures of both options so you can compare like with like.
- Can I add another indoor head to my multi-split later?
Only if the outdoor unit has a spare connection and enough capacity left. If you think you will want another room done later, say so at quote stage so the installer can choose an outdoor unit with room to grow.
- Can I run a multi-split in just one room at a time?
Yes. Each head has its own remote, so you can switch on the lounge head only and leave the bedroom heads off. On many models every head that is on has to run in the same mode, heating or cooling.
- Does a multi-split work in a house with no roof space?
Often, yes. Pipes and cables can run along outside walls inside a pipe cover, or under the floor if there is a crawl space. That makes multi-splits common in homes with flat roofs or cathedral ceilings where ducts would not fit.