Ducted vs Split System Air Conditioning
Quick Verdict
Choose ducted AC for whole-home cooling in larger homes (4+ bedrooms) where consistent temperature throughout is important. Choose split systems for smaller homes, targeted cooling, or when budget is a concern.
Side-by-Side Comparison
| Factor | Ducted Air Conditioning | Split System Air Conditioning |
|---|---|---|
| Upfront Cost | $8,000-$20,000 (installed) | $1,500-$4,000 per unit (installed) |
| Running Cost | $2.00-$3.50/hour | $0.45-$0.70/hour per unit |
| Cooling Power | Whole home cooling | Single room/area |
| Best Climate | All climates | All climates |
| DIY Install? | No | No |
Ducted Air Conditioning
Central system with ducts to multiple rooms. Hidden in ceiling with only vents visible.
Pros
- Cools entire home from one system
- Invisible - only vents visible
- Zoning available (cool specific areas)
- Consistent temperature throughout
- Higher resale value
Cons
- Much higher upfront cost
- Higher running costs (larger system)
- Requires ceiling space for ducts
- Difficult to retrofit to existing homes
- If compressor fails, whole home affected
Split System Air Conditioning
Wall-mounted indoor unit connected to outdoor compressor. One unit per room.
Pros
- Lower upfront cost
- Cool only rooms you are using
- Easy to retrofit
- If one fails, others still work
- Individual room control
Cons
- Visible indoor unit on wall
- Need multiple units for whole home
- Less consistent whole-home temperature
- Multiple outdoor units may look cluttered
- Individual units need separate maintenance
Climate Zone Guide
Hot-Dry Climates (WA, SA, Inland)
In hot-dry climates, both systems work well. Ducted evaporative may be a more cost-effective whole-home option than ducted refrigerative in these areas.
Hot-Humid Climates (QLD, NT)
In humid climates, refrigerative AC (either ducted or split) is essential. Ducted provides more consistent dehumidification throughout the home.
Temperate Climates (VIC, NSW, ACT)
In mild climates, you may not need whole-home cooling. Strategic split systems in living areas and bedrooms often suffice and cost less.
Cost Analysis
For a 4-bedroom home: Ducted system costs $10,000-$15,000 upfront, running $2,000-$3,500 per summer. Four split systems cost $6,000-$12,000 upfront, running $1,500-$2,500 per summer (assuming not all run simultaneously). Split systems can be more economical if you only cool occupied rooms.
Frequently Asked Questions
Is ducted AC more efficient than split systems?
Not necessarily. Individual split systems have efficiency ratings of 3.5-5+ stars. Ducted systems are rated differently but comparable modern systems are similar. The key difference is usage patterns - split systems only cool rooms in use, while ducted often cools the whole home.
Can I add ducted AC to an existing home?
Yes, but it's more complex and costly than in new builds. You need adequate ceiling space for ducts, and access may require cutting into ceilings. Expect 20-30% higher costs for retrofitting compared to new construction.
How many split systems equal a ducted system?
For a typical 4-bedroom home, you'd need 4-5 split systems (living, master, and 2-3 bedrooms) to match ducted coverage. Total installed cost is often similar, but split systems offer more flexibility in installation timing and room-by-room control.
Get a Personalized Recommendation
Not sure which is best for your home? Answer a few questions and get tailored advice based on your climate, home type, and budget.
Get My Free Plan