How Much Does Air Conditioning Cost in Perth? (2025 Guide)

Air conditioning is one of the most important investments you can make in a Perth home. Understanding the full cost — supply, installation, and ongoing running costs — helps you budget accurately and avoid surprises.

Split System Air Conditioning Costs

For a standard bedroom or living room (up to 25m²), a quality 2.5kW split system including supply and installation runs from approximately $1,200 to $1,800. For a larger open-plan living area (up to 50m²), a 5kW–6kW unit with installation typically costs $1,600 to $2,500. Premium brands (Daikin, Mitsubishi Electric, Fujitsu) sit at the upper end but offer better efficiency, quieter operation, and stronger warranty support.

Ducted Air Conditioning Costs

A fully ducted reverse-cycle system for a three-bedroom Perth home typically costs $5,000–$9,000. For a four-bedroom home with zoning, expect $8,000–$14,000. Factors that affect price include roof cavity access, number of zones, brand selection, and the difficulty of running ducts through the home's structure. Quotes vary widely, so get at least three from licensed refrigeration mechanics.

Evaporative Cooling Costs

An evaporative cooler for a three-bedroom home runs $3,000–$6,500 fully installed. Running costs are significantly lower than refrigerated air conditioning — around $0.07–$0.15 per hour versus $0.30–$0.80 per hour for reverse-cycle. The trade-off is reduced effectiveness on humid days.

Annual Servicing Costs

Regular servicing keeps your system running efficiently and extends its lifespan. A standard split system service in Perth (filter clean, coil check, refrigerant check) costs $120–$250. Ducted system annual services typically run $200–$400 depending on system complexity.