How to Install a Split System Air Conditioner: What's Involved
Installing a split system air conditioner is not a DIY job in Australia — it must be carried out by a licensed refrigeration mechanic (also called an HVAC technician or aircond installer). But understanding what's involved helps you plan and prepare, choose the right installer and know what questions to ask. Here's a complete overview.
What Does a Split System Installation Involve?
A split system consists of two units: an indoor unit (the head unit, mounted on a wall inside) and an outdoor unit (the compressor, placed outside). Installation connects these two units and commissions the refrigerant circuit.
Key Steps in a Typical Installation
- Site assessment — The installer assesses the wall for the indoor unit (structural integrity, stud locations, clearance from roof and ceiling), the route for the refrigerant pipe and cable, and the best location for the outdoor unit
- Mounting the indoor unit bracket — A strong metal bracket is fixed to the wall, securely into studs or masonry
- Core drilling — A hole is drilled through the wall to allow the pipe, cable and drain hose to pass from indoor to outdoor unit. This is typically 60–75mm in diameter.
- Routing the pipe and cable — Refrigerant piping, power cable and drain hose are run from the indoor unit to the outdoor unit. Can be run through the wall cavity or along the exterior wall (surface mounted in a conduit)
- Installing the outdoor unit — The compressor unit is mounted on a wall bracket, concrete pad or roof bracket and connected to the indoor unit via the pipe and cable
- Connecting the refrigerant lines — This is the licensed tradesperson component. Refrigerant lines must be brazed, flared or connected to manufacturer spec. The system is then pressure-tested and commissioned.
- Electrical connection — Power is connected from a dedicated circuit on your switchboard. Larger systems (5kW+) may require a dedicated circuit breaker to be installed by a licensed electrician.
- System testing and commissioning — The installer runs the system in both cooling and heating mode, verifies temperature delivery and shows you how to use the remote control.
How Long Does Installation Take?
A standard single-unit installation typically takes 2–4 hours. Complex installations (older homes with solid brick walls, difficult routing through roof or floor cavities, or multiple units) take longer.
What Does Installation Cost?
Standard installation in Sydney typically costs $400–$900 including all materials and labour. Factors that increase cost include:
- Double-brick or solid concrete walls (harder to core drill)
- Long pipe runs (over 5–6 metres)
- Second-floor or higher installations
- Electrical work required (new circuit or switchboard upgrade)
- Difficult roof or floor cavity access
What to Check Before Installation Day
- Confirm the installer holds a current ARC (Australian Refrigeration Council) licence — required for all refrigerant work
- Decide on the indoor unit location (most effective wall, closest to where you'll be, away from doors and windows)
- Confirm the outdoor unit location is accessible and properly ventilated
- Clear the area inside and outside around the installation points
- Confirm power availability at the switchboard
Oceania Appliances: Supply and Install Available
We supply and can arrange installation of split system air conditioners across Sydney. Contact us for more information on what's involved for your specific home and location.