Ducted reverse cycle air conditioning in Australia costs roughly $10,000-$15,000 for a medium 3BR home, up to $30,000 for a large multi-zone premium install. That is just the install - running cost, zoning strategy, and brand tier can double the 10-year total. This page has an instant estimator covering house size, zones, state climate, retrofit complexity, brand tier, and extras.
Ducted reverse cycle AC cost estimator
Estimates for 2026 metro Australia with a CEC-accredited installer. Regional pricing adds 8-15%. Get 2-3 written quotes before committing.
How to size ducted reverse cycle AC
Rule of thumb: 0.06-0.08 kW capacity per m2 for well-insulated homes in mild climate; up to 0.12 kW/m2 for older homes in hot climates. Undersize and the system runs 100% duty cycle, cooking your compressor and delivering poor comfort; oversize and it short-cycles, hurts efficiency, and costs more upfront.
| House size | Capacity range | Typical layout |
|---|---|---|
| Small (<120 m2) | 7-10 kW | 2BR unit, granny flat, cottage |
| Medium (120-160 m2) | 10-14 kW | Typical 3BR house, 2-3 zones |
| Large (160-220 m2) | 14-18 kW | Typical 4BR house, 3-4 zones |
| XL (220-300 m2) | 18-24 kW | 5BR or large 4BR, 4-5 zones |
| XXL (300+ m2) | 24-30 kW | Architectural / multiple wings, 5-6+ zones |
The three brand tiers explained
Base tier: Fujitsu General, Panasonic Aquarea
Solid Japanese-branded units with 5-year warranty. About 15% cheaper than mid-range. Slightly less efficient (COP 3.5-4.0 vs 4.0-4.5 mid-range). Adequate for mild-climate homes and set-and-forget users. Parts network is decent but slower than Daikin.
Mid-range tier: Daikin, Mitsubishi Electric
The default recommendation for most Aussie households. Daikin is the market leader by a wide margin - largest service network, highest resale value, most-often quoted by installers. Mitsubishi Electric is similar performance with slightly better warranty terms (5-7 years). Both offer inverter compressors, WiFi controls, and app-based zoning. This is what the estimator baseline pricing represents.
Premium tier: Daikin Premium (Zena, US7), Mitsubishi Heavy Industries
Higher COP (4.5-5.0), quieter operation (essential for smaller lots), better cold-weather performance (matters for TAS/VIC/ACT), longer warranty (7 years). Adds 15-25% to install cost. Worth it if you value acoustic performance or cold-weather heating.
Zone strategy - the single biggest lever for running cost
Zoning determines how much of your house gets conditioned at any moment. A 3-bedroom house zoned as "living / bedrooms" (2 zones) can shut off the bedroom zone during the day, cutting running cost by 20-30%. A 4-bedroom house with per-room control (5-6 zones) only conditions the rooms in use - dropping running cost by 40-50%.
| Zoning setup | Running cost multiplier | Best for |
|---|---|---|
| 2 zones (living / bedrooms) | 1.00x baseline | Small homes, low-touch users |
| 3-4 zones | 0.75-0.85x | Standard 3-4BR homes |
| 5+ zones | 0.60-0.65x | Larger homes, variable occupancy |
| Individual room control | 0.55x | Multi-tenant, home offices, WFH households |
Extra zones cost roughly $1,500-1,800 each in install. Payback is typically 4-8 years on running cost savings alone - faster if your electricity rate rises or you run AC heavily.
Running cost by climate zone (2026 rates)
Annual running cost assumes: 8 hrs/day cooling summer, 5 hrs/day heating winter, electricity 32c/kWh, mid-range brand with 2 zones. Multiply by the zoning multiplier above for your actual scenario.
| Climate zone | Small | Medium | Large | XL |
|---|---|---|---|---|
| Mild (NSW coast, WA coast, parts of Perth) | $750 | $1,150 | $1,800 | $2,400 |
| Hot summers (QLD, inland NSW) | $1,050 | $1,550 | $2,450 | $3,450 |
| Cold winters (VIC, TAS, ACT) | $1,150 | $1,750 | $2,700 | $3,700 |
| Extreme (SA, NT) | $1,300 | $2,050 | $3,250 | $4,500 |
Solar offset: if you have 6+ kW rooftop solar, running your ducted AC mid-day (10am-3pm) effectively costs 5c/kWh instead of 32c/kWh. Annual running cost drops 40-60% for households that pre-cool during solar hours.
Ducted vs split systems - the honest comparison
The most common question we get: "Is ducted worth it, or should I just get 3-4 splits?"
| Aspect | Ducted reverse cycle | 3-4 splits |
|---|---|---|
| Upfront cost (typical 3BR home) | $10,000-15,000 | $8,000-11,000 |
| Running cost (variable use) | Lower with good zoning | Lower if only 1-2 splits ever on |
| Aesthetics | Almost invisible (only floor / ceiling grilles) | Wall-mounted units in every room |
| Whole-house comfort | Even temperature, no doors closed | Only conditioned rooms comfortable |
| Retrofit complexity | Hard in double-storey, cathedral ceilings | Straightforward almost anywhere |
| Maintenance | One outdoor unit, one filter panel | Multiple indoor units, multiple filters |
| Resale value uplift | Higher (premium buyer expectation) | Marginal |
| Best for | New builds, large single-storey, whole-home use | Existing double-storey, budget-constrained, room-by-room use |
Ducted wins on aesthetics, resale, and whole-house comfort. Splits win on upfront cost, retrofit simplicity, and pay-as-you-use running cost. Zoned ducted with individual room control gets close to split-system flexibility.
Retrofit challenges (double-storey, cathedral ceilings, heritage)
Double-storey homes
The tough one. Ducting from a roof-mounted unit needs bulkheads or dropped ceilings to reach downstairs rooms. Adds 25-40% to install cost. Some installers refuse to quote. Alternatives: two smaller systems (one per level) or high-wall split system for upstairs bedrooms.
Cathedral ceilings
No roof space for ducting means bulkheads, exposed insulated ducting, or floor-mounted ducted systems. Aesthetically challenging. Consider single-storey ducted + wall-mounted units for the cathedral zone.
Heritage / listed homes
Council restrictions on visible outdoor units and roof-mounted plant. Get pre-lodgement advice from council before quoting. Slim-line inverter units and ground-mounted plant enclosures may be the only compliant option.
Warranty and service intervals
- Standard warranty: 5 years parts and labour (base and mid tier); 7 years (premium tier).
- Compressor warranty: often longer (7-10 years) but check parts vs labour separately.
- Service interval: annual professional service is recommended and often required for warranty. $150-$300 per service.
- Filter cleaning: monthly during heavy use. Saves 10-15% on running cost by keeping efficiency up.
How to compare ducted AC quotes
- Get itemised quotes covering: outdoor unit (model number), indoor unit, ducting (metres), controllers, zoning, electrical, permits, disposal of old system. Reject "supply and install $X" flat quotes.
- Verify the model numbers - "Daikin ducted" is not specific. You want the exact model (e.g., FDXM71RVMA + BRC1E63) so you can cross-check pricing and warranty online.
- Check the installer's ARCtick licence - refrigerant handling licence, required by law. Look up at arctick.org.
- Ask about warranty and service - who honours the warranty, and does the installer service what they install? Cheap installers often disappear before your first service.
- Confirm switchboard capacity - a 14 kW system typically needs 3-phase power OR a 32A single-phase circuit. Old switchboards often need upgrade ($800-2,000) that gets sprung on you after install starts.
→ Use our free quote comparator to spot missing items across 2-3 ducted AC quotes.
Frequently asked questions
How much does a Daikin ducted system cost?
Daikin is the market-leading brand and typically represents the mid-range price tier. A Daikin ducted install for a typical 3BR house (medium size, 3 zones, single-storey retrofit, mid-range spec) runs $12,000-$16,000 installed in 2026. Premium Daikin models (Zena, US7) add 15-20%.
How much does a Mitsubishi ducted system cost?
Mitsubishi Electric mid-range is comparable to Daikin pricing - $11,500-$15,500 for a 3BR install. Mitsubishi Heavy Industries premium units run $14,000-$18,500 for the same job.
Ducted vs multi-split - which is cheaper?
Multi-split is 20-30% cheaper upfront ($8,000-$11,000 for 4 heads vs $10,000-$15,000 ducted). Running cost is similar if usage patterns are similar - splits win if you only condition 1-2 rooms most of the time; ducted with good zoning wins if you use the whole house.
Can I retrofit ducted AC in a 1970s brick home?
Yes - single-storey with roof access is straightforward. Cost typically $12,000-$18,000 for a 3BR. Older switchboards often need upgrade ($800-2,000) so budget for that. Rendered / double-brick walls don't affect ducting complexity.
What size ducted AC do I really need?
A quality installer does a load calculation (room-by-room). Rough starting point: 0.08 kW per m2 for mild-climate well-insulated homes; 0.12 kW/m2 for hot climate or older homes. So a 160 m2 home in Brisbane wants around 14-18 kW. Insulation, glazing, orientation, and roof colour all matter.
Are cheap ducted systems worth it?
Below-market quotes (30%+ under industry norm) usually mean: base-tier brand with 3-year warranty, minimal zoning, no fresh air, undersized capacity. All the compromises stack up in years 3-8 when the system underperforms and warranty runs out. Mid-range tier from Daikin or Mitsubishi + 5-year warranty is the sweet spot.
Do I need three-phase power?
Systems above 14 kW capacity typically need 3-phase power. Homes with only single-phase (most older suburbs) can either upgrade to 3-phase ($3,000-$8,000 electrical work) or install two smaller single-phase systems. The switchboard upgrade often ends up as the biggest hidden cost.
Should I get zoning or just multi-splits?
Zoning is worth it for whole-house comfort + resale value. Multi-splits are worth it if you strictly use 1-2 rooms at a time. Modern zoned ducted with individual room controls gets 80% of the flexibility of splits with the aesthetic + resale benefit of ducted.
Related tools
- Electrician Cost Australia - for switchboard upgrades and circuit work
- Solar Payback Calculator - solar dramatically cuts AC running cost
- Hot Water System Cost Calculator - the other big home energy decision
- Renovation Quote Comparator - paste your AC quotes for red-flag analysis
- Home Extension Cost Calculator - if you're building/extending, size AC into the build
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