Two Great Options — But Different Purposes
When it comes to whole-home air conditioning, the choice usually comes down to a ducted system or multiple split systems. Both can deliver excellent comfort, but they suit different homes, budgets, and lifestyles. Here's a thorough side-by-side comparison.
How Each System Works
Ducted systems use a central unit (typically in the roof space or under the floor) to deliver conditioned air through a network of ducts to outlets (vents) in each room. A single thermostat or a zoning controller manages the whole home.
Split systems have an indoor wall-mounted unit connected to an outdoor compressor. Each unit cools or heats a specific area. Multiple splits can be installed throughout a home — sometimes connected to the same outdoor unit in a "multi-split" configuration.
Feature Comparison
| Feature | Ducted System | Split System(s) |
|---|---|---|
| Aesthetics | Discreet ceiling vents, no visible indoor units | Wall-mounted units visible in each room |
| Upfront Cost | Higher (installation is complex) | Lower per unit; cost adds up for whole home |
| Running Cost | Efficient when zoned properly | Efficient; only run what you need |
| Installation Disruption | Higher — ductwork in roof/walls | Lower — minimal invasive work |
| Zoning Flexibility | Excellent with a zoning system | Excellent — each unit is independent |
| Suitability | New builds, larger homes | Existing homes, apartments, smaller spaces |
| Maintenance | Duct cleaning every few years + annual service | Filter cleaning + annual service per unit |
When to Choose a Ducted System
- You're building a new home and can incorporate ductwork during construction
- You want a seamless, invisible appearance throughout your home
- Your home is large (typically 200 m² or more) with many rooms to condition
- You want centralised control with sophisticated zoning options
- You prefer to avoid multiple indoor units on your walls
When to Choose Split Systems
- You're retrofitting an existing home without roof space for ducting
- You only need to cool specific rooms (e.g., bedrooms and living areas)
- You're working with a tighter upfront budget
- You want the flexibility to add units gradually over time
- You live in an apartment or smaller dwelling
The Hybrid Approach
Some homeowners opt for a combination: ducted cooling throughout the main living areas paired with individual split systems in key bedrooms. This can offer the aesthetic benefits of ducted AC where it matters most, with the flexibility of dedicated units for sleeping areas.
Cost Perspective
Ducted systems involve a larger upfront investment due to the complexity of installation and the cost of the central unit and ductwork. However, for a large home where you'd otherwise need six or more split systems, the total cost can become comparable. Always get multiple quotes for both options before deciding.
Our Recommendation
For new builds or homes undergoing major renovation: seriously consider ducted. For established homes, apartments, or if you're cooling specific zones only: split systems are typically the more practical and cost-effective choice. Either way, work with a licensed HVAC professional to design the right solution for your specific floor plan and climate.