Choosing between a split system and ducted air conditioning is one of the biggest decisions Brisbane homeowners face. Both work well in our climate, both cool your home effectively, and both have their place.
The right choice depends on your home’s layout, your budget, how many rooms you want to cool, and how you use your space day to day.
Here’s an honest comparison from a licensed Capalaba electrician and air conditioning installer who fits both types across Brisbane’s Bayside every week.
Split System Air Conditioning — The Basics
A split system consists of an indoor unit mounted on the wall and an outdoor compressor unit. Each indoor unit cools one room or area. If you want to cool multiple rooms, you install multiple split systems (or a multi-split system with one outdoor unit serving several indoor units).
Best for:
- Cooling 1-3 specific rooms
- Smaller homes, apartments, and townhouses
- Homeowners on a tighter budget
- Homes where you don’t need whole-house cooling
- Rentals and investment properties
Ducted Air Conditioning — The Basics
A ducted system has a central unit (usually in the ceiling or under the floor) that distributes cooled or heated air through ducts to every room via ceiling vents. A single system cools your entire home.
Best for:
- Cooling the whole house at once
- Larger homes with 4+ bedrooms
- Homeowners who want a clean, invisible look (no wall units)
- New builds and major renovations
- Families who use most rooms throughout the day
Head-to-Head Comparison
| Factor | Split System | Ducted |
|---|---|---|
| Upfront cost | $1,500 – $3,000 per unit installed | $8,000 – $20,000+ installed |
| Running cost | Lower (only cools rooms in use) | Higher (cools whole home), but zoning helps |
| Coverage | One room per unit | Whole home from one system |
| Appearance | Visible wall-mounted unit in each room | Hidden — only ceiling vents visible |
| Installation time | 2-4 hours per unit | 1-3 days for a full system |
| Installation disruption | Minimal | Significant (ceiling access needed) |
| Zoning | Each unit is its own zone | Zone controllers available (at extra cost) |
| Heating | Reverse cycle (most models) | Reverse cycle (most models) |
| Lifespan | 10-15 years | 15-20 years |
| Maintenance | Filter cleaning + professional service | Filter cleaning + professional service + duct inspection |
Cost Breakdown for Brisbane Homes
Here’s what Brisbane homeowners typically pay for each option:
Split System Costs
| Room Size | Unit Size | Typical Cost (Installed) |
|---|---|---|
| Small bedroom (up to 20m²) | 2.5kW | $1,200 – $1,800 |
| Standard bedroom / study (20-35m²) | 3.5kW | $1,500 – $2,200 |
| Living area (35-50m²) | 5.0-7.0kW | $2,000 – $3,000 |
| Large open plan (50-65m²) | 7.0-8.5kW | $2,500 – $3,500 |
Ducted System Costs
| Home Size | System Size | Typical Cost (Installed) |
|---|---|---|
| Small home (2-3 bedrooms) | 7-10kW | $8,000 – $12,000 |
| Medium home (3-4 bedrooms) | 10-14kW | $10,000 – $16,000 |
| Large home (4-5 bedrooms) | 14-20kW | $14,000 – $22,000 |
These prices include supply, installation, electrical work, and commissioning. Ducted systems with zone control add $1,500–$3,000 to the total but save significantly on running costs by only cooling occupied rooms.
Running Costs — The Long-Term Picture
Upfront cost tells only half the story. Running costs are where the real comparison gets interesting.
Split systems are cheaper to run if you’re only cooling 1-3 rooms at a time. You only power the units you switch on. A single 5kW split system running 8 hours a day costs roughly $1.50-$2.00 per day in Brisbane.
Ducted systems cost more to run because they have a larger compressor. However, with zone control, you can close off unused rooms and reduce the effective load. A ducted system with zones, running sensibly, costs roughly $4-$8 per day for a typical 4-bedroom Brisbane home.
The crossover point is typically 3-4 rooms. If you’re regularly cooling 4 or more rooms, a ducted system with zones can actually be comparable to running 4 separate split systems — and often more efficient because of the centralised, inverter-driven design.
Brisbane Climate Considerations
Brisbane’s subtropical climate affects which system makes more sense:
- Long cooling season. Brisbane needs active cooling from roughly October to April — about 7 months. This makes efficiency important. Inverter-driven systems (both split and ducted) are essential in our climate.
- Humidity control. Both split and ducted systems dehumidify as they cool. In Brisbane’s humid summers, this function is almost as important as temperature control. Ducted systems with return-air management typically handle humidity slightly better across the whole home.
- Mild winters. Brisbane winters are mild enough that reverse-cycle air conditioning handles heating easily. Both split and ducted systems offer efficient heating for Brisbane’s cool (not cold) mornings.
- Queenslander and highset homes. These homes, common across Capalaba, Alexandra Hills, and the Redlands, often have accessible ceiling spaces that make ducted installation easier. However, some older Queenslanders lack the ceiling height for ducted systems. Split systems are the simpler option for these homes.
- Storm and power considerations. Both systems need reliable power. If your switchboard is older, you may need an upgrade to support either option — especially ducted systems, which draw more power.
Which Should You Choose? Decision Guide
Choose split systems if:
- You want to cool 1-3 rooms
- Your budget is under $5,000
- You want minimal installation disruption
- You’re in a rental or investment property
- You only use certain rooms at certain times
Choose ducted if:
- You want whole-home cooling
- You have 4+ bedrooms
- You prefer a clean look with no wall units
- You’re building or doing a major renovation
- Your family uses most rooms throughout the day
- You value long-term efficiency and resale value
Consider a hybrid approach if:
- You want ducted for the main living areas and bedrooms, plus a separate split system for a detached room, garage, or granny flat
- You want to stage the investment — start with a split system now and consider ducted later
What About Multi-Split Systems?
A multi-split system uses one outdoor unit connected to 2-5 indoor units in different rooms. It’s a middle ground between individual split systems and ducted.
Pros: Fewer outdoor units (better aesthetics), each room controlled independently, lower cost than ducted.
Cons: If the single outdoor unit fails, all rooms lose cooling. Installation is more complex than standard splits. Not as clean-looking as ducted.
Multi-splits work well for townhouses and apartments where outdoor space is limited but you need cooling in multiple rooms.
Frequently Asked Questions
Is ducted air conditioning worth the extra cost?
For homes with 4+ bedrooms where the family uses most rooms regularly, ducted is almost always worth it. The upfront cost is higher, but the comfort level, aesthetics, and home value increase make it a strong investment. For smaller homes or specific-room cooling, split systems are the better value.
Can I add ducted air conditioning to an existing home?
Yes, in most cases. It requires ceiling space for the unit and ductwork. Homes with accessible roof cavities (common in Brisbane) are generally straightforward. The installation takes 1-3 days and involves some ceiling penetrations for vents.
How many split systems equal a ducted system?
In terms of coverage, 4-6 split systems would match a ducted system for a typical 4-bedroom home. At that point, the combined cost of split systems ($6,000-$12,000) starts approaching a ducted system ($10,000-$16,000) — and the ducted system is more convenient, quieter, and better looking.
Which is better for resale value?
Ducted air conditioning is a premium feature that adds measurable value to a home. Buyers expect it in higher-value properties. Split systems are standard and expected but don’t add the same premium. For investment properties, split systems are more cost-effective.
Do I need a switchboard upgrade for air conditioning?
Possibly. Both split and ducted systems require dedicated electrical circuits. If your switchboard is older or at capacity, an upgrade may be needed. Ducted systems draw more power, making a switchboard upgrade more likely. Your installer will assess this during the quoting process.
What size air conditioner do I need?
Sizing depends on room dimensions, ceiling height, insulation, window orientation, and Brisbane’s climate zone. Undersizing means the system works too hard (higher bills, shorter life). Oversizing means inefficient cycling and poor humidity control. A proper heat-load calculation by your installer ensures the right size.
Can the same person install the air conditioning and do the electrical work?
Only if they hold both an electrical licence and an ARC refrigerant handling licence. At Amplus, Aaron holds both — which means the electrical and air conditioning work are done by one person, with no coordination issues between separate trades.
How long does installation take?
Split system installation takes 2-4 hours per unit. Ducted system installation takes 1-3 days depending on the size of the home and complexity of the ductwork. Your installer will confirm the timeframe during the quoting process.
Need Help Deciding?
The best way to choose is to get an on-site assessment. Your home’s layout, ceiling space, electrical capacity, and how you use your rooms all factor into the recommendation.
Amplus Electrical & Air installs both split systems and ducted air conditioning across Capalaba, Alexandra Hills, Cleveland, Thornlands, Wellington Point, Birkdale, Victoria Point, Ormiston, Wynnum, Manly, and surrounding Bayside suburbs.
Aaron is a fully licensed Queensland electrician (Lic. #1500996) and ARCtick-certified air conditioning technician (ARC Lic. #L1833747). He can assess your home, recommend the best option for your situation, and handle the full installation — electrical and air conditioning — as one coordinated project.
📞 Call Aaron: 0419 014 146
📅 Book an air conditioning assessment online