Split system and ducted air conditioning both heat and cool Canberra homes well. The better choice depends on your floor plan, how many rooms you want to condition, your ceiling or wall space, and your budget for installation and running costs.
A split system is a wall unit in one room with an outdoor condenser. A ducted system has one outdoor plant and a central fan in the ceiling that pushes air through ducts to outlets in several rooms. Neither is “best” for everyone. This page compares them honestly so you can decide, or call us for a site check.
What a split system is
A split system air conditioner has two units: a wall-mounted head unit inside and a condenser outside. One indoor unit conditions one room, and multiple indoor units can share a single outdoor unit in some configurations.
Reverse-cycle split systems can both heat and cool, making them a genuine year-round option for Canberra homes.
Advantages of a split system
Lower upfront cost for one or two rooms. A split system is usually the cheaper way to condition a bedroom, living room or home office. It is also less invasive to install: the indoor unit mounts on a wall and a small refrigerant pipe connects to the outdoor unit.
You can start small and add later. A ducted system is usually installed for the whole house at once. Split systems let you begin with the rooms you actually use, and more indoor units can be added later where the outdoor unit’s capacity and the system’s design allow.
Easier servicing and filter access. Split system filters slide out of the indoor unit for routine cleaning. Servicing one head unit is usually quicker than servicing a ducted plant and a roof full of ductwork.
No ductwork cavity required. If your home has a flat roof, tight ceiling space or no ceiling cavity at all, ducted air conditioning may not be practical. Split systems do not need that space, although pipework, drainage and mounting still have to suit the site.
Disadvantages of a split system
One indoor unit conditions one space. To condition the whole house you need an indoor unit in each main room, and the visible wall units may not suit your design.
Outdoor units take wall or ground space. Each outdoor condenser needs a spot with clear airflow, which can be awkward on a small balcony or courtyard.
Multiple units can add up. Conditioning the same rooms with several separate outdoor units is not always cheaper to run than one ducted plant with zoning. Compare the actual models and how you use them before assuming either option wins.
What a ducted system is
A ducted air conditioning system has one outdoor condenser and an indoor fan coil in the ceiling. Ductwork carries the air to outlets in each room, and a return-air grille draws room air back through the system.
Reverse-cycle ducted systems can both heat and cool, and most modern ones add zoning so you can run one part of the house without conditioning rooms you are not using.
Advantages of a ducted system
Whole-home comfort from one plant. Ducted air conditioning is the clean way to condition most of the house without a head unit on every wall.
Zoning controls running cost. With motorised zone dampers you can condition the living areas during the day and the bedrooms at night instead of running the whole house.
Ceiling outlets are discreet. Outlets are almost invisible compared with wall-mounted head units.
Suited to new builds and larger homes. Ducted air conditioning is easier to plan in a new build or major renovation than it is to retrofit.
Disadvantages of a ducted system
Higher installation cost. Ducted air conditioning costs more than one or two split systems because the indoor unit, ductwork and zoning are all installed at once.
Needs ceiling space. Ducted systems need room above the ceiling for the fan coil and ducts, which is not always available in a tight roof or a two-storey home with no ceiling cavity upstairs.
Efficiency can fall if ducts leak or insulation fails. Ductwork is hidden. A torn or uninsulated duct sends conditioned air into the roof space and raises running cost.
Zoning needs to be designed properly. A badly sized system can lose airflow or worsen comfort when too many zones close at once.
Split system or ducted: the quick comparison
| Consideration | Split system | Ducted |
|---|---|---|
| Best for | One or two rooms, small homes, rentals | Whole-home comfort |
| Upfront cost | Lower for one or two rooms | Higher |
| Running cost | Efficient per unit; several units can add up | Efficient if ducts and zones are sound |
| Works without ceiling space | Yes | Usually no |
| Wall units visible | Yes | No |
| Zoning | One unit per zone | Built in with zone dampers |
| Servicing | One indoor unit per unit | Plant plus ductwork |
Which should you choose?
Choose a split system if you mainly want to condition one or two rooms, or your ceiling has no room for ducts. Choose ducted air conditioning if you want the whole house comfortable, the wall units would bother you, and your ceiling can take the ductwork.
If you are unsure, book a site check. Green Air Heating and Cooling in Fyshwick assesses your home and tells you which system is the practical fit, not the most expensive one. Call 0412 794 558.