How to Choose a Split System Air Conditioner in Australia
A reverse cycle split system air conditioner is one of the most cost-effective ways to heat and cool your home. But choosing the right one — the right size, the right brand and the right features — is not always straightforward. This guide breaks it down clearly.
Reverse Cycle vs Cooling-Only
Always choose reverse cycle. A cooling-only unit cannot heat, so you'll still need a heater for winter. A reverse cycle system does both, and in Sydney's mild winters it uses electricity far more efficiently than any other electric heating method. The small price difference is worth it every time.
What Does kW Mean?
kW (kilowatts) is the measure of heating and cooling capacity. Bigger kW = more powerful = suitable for larger rooms. If the unit is undersized for your room, it will run constantly and never reach the target temperature. If oversized, it will cycle on and off too frequently without properly dehumidifying the air.
How to Calculate the Right Size
A rough rule of thumb for Australian homes:
- Up to 20m² (small bedroom): 2.5kW
- 20–40m² (large bedroom, small lounge): 3.5kW
- 40―60m² (medium lounge): 5.0kW
- 60–80m² (large open plan): 7.1kW
These are starting points only. Adjust upward if the room has poor insulation, large windows facing north or west, high ceilings or if you're in a hotter climate (like western Sydney).
Energy Efficiency: What the Star Rating Means
Split systems display two star ratings — one for cooling efficiency and one for heating efficiency. More stars = more efficient = lower running costs. For a system running 8 hours a day, the difference between 2 and 5 stars can be over $200 per year.
Look for a system with a Coefficient of Performance (COP) of at least 3.5 for heating — this means it delivers 3.5kW of heating for every 1kW of electricity it consumes.
Inverter vs Non-Inverter
Always buy inverter. Non-inverter units work at full power or not at all, cycling on and off as the room reaches temperature. Inverter units vary their output continuously to maintain the set temperature — they're quieter, more efficient and reach temperature faster.
Key Features to Look For
- Wi-Fi connectivity — control from your phone wherever you are. Very useful for pre-cooling or heating before you arrive home.
- Sleep mode — gradually adjusts temperature overnight for comfort and efficiency
- Timer function — schedule operation to avoid running when you're out
- Filter cleaning indicator — tells you when the filter needs washing
- Self-cleaning function — dries the coils after cooling to prevent mould growth
Best Brands in Australia
Daikin
Daikin is widely regarded as the best split system brand in Australia. Japanese engineering, excellent reliability record, good spare parts availability and a strong dealer network. Worth the premium price for longevity.
Mitsubishi Electric
Mitsubishi Electric (not to be confused with Mitsubishi Heavy Industries — a different company) makes excellent split systems. Known for extremely quiet operation and reliability.
Panasonic
Panasonic systems offer very good efficiency ratings and competitive pricing. A reliable choice that suits most homes.
Hisense
Hisense offers the best value entry-level split systems. Good for a first system in a bedroom or secondary room where top-tier performance is less critical.
Installation Requirements
All split system installations must be performed by a licensed refrigeration mechanic. This is a legal requirement in Australia (ARC licence). Budget approximately $300–600 for a standard installation, depending on complexity and pipe run length.
Buy a Split System in Sydney
Oceania Appliances stocks reverse cycle split systems from Daikin, Panasonic, Hisense and other trusted brands. We offer free delivery across Sydney and a 3–6 month warranty on every appliance. We can also connect you with trusted local installers.
Browse our air conditioner range online or visit our Wetherill Park showroom. Open 7 days, 10am to 8pm.
Oceania Appliances — helping Sydney households stay cool in summer and warm in winter.