Ducted or split system: which suits a Traralgon home?

A split system is the cheaper way to heat and cool one or two rooms you actually live in, while a ducted reverse cycle system suits a house where you want most rooms kept comfortable from one control. A multi-split sits between the two, and gas ducted heating warms the whole house but gives you no cooling at all. The right pick for a Latrobe Valley house usually comes down to how many rooms you use, what is above the ceiling and whether the property is rented.

How do the four main options compare side by side?

The price column uses Melbourne metro guide ranges from What’s The Damage? (October 2026, GST included). A local quote may differ, and the Traralgon heating and cooling cost guide explains why.

Option	What it heats and cools	Melbourne guide price
Single split system (5 kW)	One room or an open living area	$1,900 to $3,675
Multi-split (two heads)	Two rooms from one outdoor unit	$4,200 to $7,900
Ducted reverse cycle, basic	Most or all of the house through ceiling outlets	$8,400 to $14,700
Gas ducted heating	The whole house through floor or ceiling outlets	$4,000 to $11,550

Space, zoning and cooling for each option:

• Single split system: wall space inside and an outdoor unit spot nearby; one room per unit; cools as well as heats.
• Multi-split: wall space in each room and a pipe route back to one outdoor unit; each head runs on its own; cools as well as heats.
• Ducted reverse cycle: roof space for the indoor unit and ducts, plus an outdoor unit; zoning is possible and more zones cost more; cools as well as heats.
• Gas ducted heating: roof or underfloor space for ducts and a spot for the furnace; zoning is possible on many systems; no cooling.

When does a single split system make the most sense?

A split system fits best when the heating and cooling you need is mostly in one place. Typical cases around Traralgon:

• A lounge and kitchen area where the family spends winter evenings, with bedrooms left cool.
• Replacing an old gas wall furnace in the main living area.
• A granny flat, study or extension the existing heating never reached.
• A rental where the main living area needs an efficient heater and cooling.

Split systems also leave nothing in the roof, which helps in a house where the roof space is tight or awkward to work in. Sizing a split for the room is covered on the split system installation page, so it is not repeated here.

When is a multi-split the better fit?

A multi-split connects two or more indoor heads to one outdoor unit. People choose it when they want two or three rooms done but have room for only one outdoor unit, or do not want several units lined up along the side of the house. Each head can run at its own setting. The trade-off is that one outdoor unit serves every head, so a fault there affects all of the rooms it serves. The multi-split systems page covers how many heads one outdoor unit can carry.

When is ducted reverse cycle worth the extra cost?

Ducted reverse cycle earns its higher price in a house where most rooms are used most days: three or four bedrooms with people in them, a family room and a study, and someone home during the day. One indoor unit in the roof feeds outlets in each room, and zones let you heat the living areas in the evening and the bedrooms overnight without running the whole house.

It needs enough roof space for the indoor unit and the duct runs, and an installer has to be able to get in there to fit them. Energy Victoria’s buyers guide suggests deciding which rooms need heating and cooling, and whether zones matter to you, before quotes are requested. Whole-house sizing and zoning sit on the ducted reverse cycle page.

Is gas ducted heating still a sensible choice?

Plenty of valley homes already have a gas ducted furnace, and in an owner-occupied house it can stay, be serviced and be repaired. As a new purchase it has two limits. It heats only, so a hot January still needs a separate cooling system. And for a rental, a gas ducted system that permanently fails or cannot be repaired from 1 March 2027 has to be upgraded to a fixed energy efficient heater in the main living area under the Consumer Affairs Victoria heating standard. If you want to keep gas ducted heating running, the gas ducted heating page covers servicing and replacement.

What do the 2027 rental rules mean for this choice?

For landlords the choice is partly made by the rules. Under the Consumer Affairs Victoria heating standard, an energy efficient fixed heater from 1 March 2027 means either a non-ducted electric air conditioner or heat pump with a GEMS heating rating of two stars or more for the area, or ducted electric heating whose GEMS Heating Seasonal Performance Factor is at least 3.2. Gas ducted heating does not meet that definition.

Energy Victoria’s rental homes page adds a cooling rule. Once a new lease begins or a lease goes periodic on or after 1 March 2027, the lounge or main living area needs efficient reverse cycle cooling, and from 1 July 2030 every rental needs it whatever the lease. That makes a reverse cycle split in the living area a sensible answer for many rentals: one unit can satisfy both the heating rule and the cooling rule. The rental heating checklist sets out every rule and date.

What does a careful installer check before recommending one?

A business that knows its work will look at the house before it tells you which option fits. Expect questions or a visit covering:

What gets checked	Why it changes the recommendation
Which rooms you use and when	Decides between one split, several heads or ducting
Roof space height, access and insulation	Ducting needs room to work; poor insulation raises the size needed
Where outdoor units can go	Noise near bedrooms and neighbours, airflow and the pipe route
Switchboard and wiring	Larger systems may need a new circuit or switchboard work
Existing heater and flue	What has to be removed, capped or made safe
Draughts and single glazing	Energy Victoria says these affect how much heating and cooling you need

A good installer will also tell you when a bigger system is the wrong answer. Energy Victoria points out that an oversized unit tends to waste energy and money.

What about running costs?

Running costs depend on the size of the system, how efficient it is and how you use it, so this page gives no figures. Two points from the Energy Victoria buyers guide are worth keeping in mind: improving draughtproofing and insulation can cut the amount of heating and cooling a house needs, which can lower both the system price and the running cost, and a quote should state the efficiency of the system so you can compare like with like. Heating only the rooms in use, whether with splits or ducted zones, generally uses less energy than heating every room.

Which option fits a typical valley house?

The housing around Traralgon, Morwell and Moe ranges from post-war State Electricity Commission era homes to recent brick estates, so there is no single answer. As a rough guide:

1. A smaller older house with an open lounge and kitchen: one well-sized split in the living area, perhaps a smaller one for the main bedroom.
2. A three-bedroom brick veneer house with good roof space: ducted reverse cycle with two zones, or a multi-split if only a few rooms matter.
3. A larger two-storey home on a newer estate: ducted reverse cycle, sometimes as two systems, one per floor.
4. A house with a working gas ducted furnace you are happy with: keep it serviced and add a split for cooling, or plan a full change to reverse cycle when the furnace nears the end of its life. The gas to electric heating page covers the switch.

Who gives the final recommendation?

The independent heating and cooling businesses that receive enquiries from this site assess the house, recommend a system and quote for it. You can describe your rooms and current heating and ask more than one of them to compare options.

Next step: describe the house so a provider can say which option fits

When you ask which system suits your home, include the suburb, the number of bedrooms and living areas, which rooms you use most in winter and summer, whether the house is single or double storey, what heating it has now, and whether it is owner-occupied or rented. A photo of the roof space through the manhole, if you can take one safely, and of the spots where an outdoor unit could go, will help a business tell you early whether ducting is practical.

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