Ducted vs Split System Air Conditioning in Perth — Which to Choose

Choosing between ducted and split system air conditioning is one of the biggest decisions Perth homeowners face when upgrading or installing cooling. Both have genuine advantages — the right answer depends on your home's size, layout, and budget.

Split System Air Conditioning

A split system consists of an indoor wall unit and an outdoor compressor connected by refrigerant pipes. They're ideal for cooling one or two rooms and are the most affordable option to install. Modern split systems from brands like Daikin, Fujitsu, and Mitsubishi Electric are exceptionally energy-efficient, with some models achieving 6-star or higher ratings.

The main limitation is coverage — each unit cools one zone. For a four-bedroom home you'd need multiple units, and installation costs add up. That said, multi-head split systems allow one outdoor unit to power multiple indoor units, bridging the gap between split and ducted.

Ducted Air Conditioning

A ducted system uses a central unit (usually in the roof cavity) connected to vents throughout the home. This provides seamless whole-home cooling and heating from a single system. Zoned ducted systems let you cool only specific areas, dramatically reducing running costs if used sensibly.

Ducted systems require more upfront investment — typically $6,000–$14,000 for a Perth home — and installation is more disruptive (particularly in existing homes). They're best suited to new builds or major renovations where ducting can be integrated into the construction phase.

Which is Right for Perth's Climate?

Perth's dry summer heat suits both technologies. Evaporative cooling is also very effective here during dry conditions, offering very low running costs. However, evaporative coolers perform poorly during humid weather (when a coastal sea breeze brings moisture), which increasingly affects coastal suburbs in summer.

For most Perth homeowners, the practical question is budget. If your priority is to cool the main living area and master bedroom efficiently, two quality split systems will often outperform a cheap ducted installation at a lower overall cost.