Split system air conditioning has become the go-to choice for Queensland homes — and for good reason. But getting the right unit and having it installed properly makes a bigger difference than most people realise. Here's what we've learned after installing hundreds of units across the Sunshine Coast.
Why Split Systems Are QLD's Most Popular A/C Choice
Walk down any street in Buderim, Maroochydore or Noosa and you'll spot wall-mounted indoor heads with condensers sitting outside — split systems, everywhere. The reason isn't just habit. Split systems genuinely suit Queensland's housing stock and climate better than ducted systems for most situations.
They're efficient, quiet, and you can cool the rooms you actually use without chilling an empty house. Installation is relatively straightforward compared to ducted, and modern inverter units have made the running costs very competitive. For most Sunshine Coast households, a quality split system will outperform almost anything else dollar-for-dollar.
Choosing the Right Size — Getting the kW Right
Unit sizing is probably the most misunderstood part of the process. Too small and the unit runs flat-out trying to keep up, burning energy and wearing itself out. Too large and it short-cycles — switching on and off before it can properly dehumidify the room, leaving the air clammy even when it's technically cool.
Room size is the starting point, but it's not the only variable. On the Sunshine Coast, we factor in ceiling height (most older homes have 2.4m, plenty of new builds are pushing 2.7m or higher), insulation quality, window area and orientation, and whether the room gets direct afternoon sun. A west-facing bedroom with a full-length window is a very different heat load to a shaded study of the same floor area.
That said, a rough room-size guide gets you in the right ballpark:
| Room Size | Recommended Capacity | Typical Room Examples |
|---|---|---|
| Up to 20 m² | 2.5 kW | Small bedroom, study, sunroom |
| 20–40 m² | 3.5 kW | Main bedroom, mid-size lounge |
| 40–60 m² | 5–6 kW | Large living area, open plan kitchen/dining |
| 60 m²+ | 7–9 kW | Large open-plan living, upstairs zone |
* These are guide figures only. Ceiling height, insulation, window area, and sun orientation all affect the correct sizing. When in doubt, go up a size — slightly oversizing is far less problematic than undersizing in QLD's summer heat.
What's Actually Involved in a Split System Installation
A lot of people expect it to be a quick job. It can be, but there are more steps involved than most realise — and each one matters if you want the system to run reliably for 10–15 years.
Mounting the Indoor Unit
The indoor head gets mounted on an internal wall, typically as high as practical to allow the unit to circulate air across the whole room. We assess the wall structure first — stud locations, any obstructions — and position the mounting plate accordingly. Getting this right matters: a unit that vibrates because it's on a poorly-secured mount will be annoying and potentially damaging over time.
Placing the Outdoor Unit
The condenser (outdoor unit) needs adequate airflow around it and a clear discharge path. We avoid placing units where they'll re-circulate hot exhaust air, cop direct western sun all afternoon, or create noise issues close to a neighbour's bedroom window. Coastal properties need extra consideration — more on that below.
Running the Line Set
The refrigerant line set — twin copper pipes that carry refrigerant between the indoor and outdoor unit — gets run through the wall and along the outside of the building (or concealed in the wall cavity where possible). These are insulated to prevent heat gain and moisture issues. A proper line set installation avoids sharp bends that restrict refrigerant flow.
The Electrical Connection
This is where a licensed electrician becomes non-negotiable. More on this in the next section.
The Drain Line
The indoor unit produces condensate (water) as it cools the air. This needs to drain somewhere sensible — not onto a path, not into a garden bed that will turn into a mud pit, and definitely not through the wall where it can cause water damage. We run drain lines to an appropriate discharge point, usually to a downpipe or garden drainage area.
Commissioning and Testing
Once everything's connected, the system gets tested across all its operating modes — cooling, heating if applicable, fan speeds, and timer functions. We check the refrigerant pressures to confirm the system has the correct charge and is operating within spec. A unit that leaves the job working and commissioned properly is one that will still be working efficiently years later.
Why the Electrical Connection Must Be Done by a Licensed Electrician
Split systems don't plug into a standard power point. They require a dedicated circuit — a separate circuit breaker on your switchboard, sized and wired specifically for the A/C unit. This work must comply with AS/NZS 3000 (the Australian Wiring Rules) and can only be legally performed by a licensed electrician in Queensland.
Important: It's illegal for refrigeration mechanics who are not also licensed electricians to do the electrical connection. If someone installs your A/C and connects it to a power point or uses an extension lead, walk away — this creates a genuine fire and electrocution risk and will void your home insurance.
A dedicated circuit means the A/C isn't competing with other loads on a shared circuit. It protects the unit from voltage fluctuations caused by other appliances, and it means if there's ever an electrical fault, the circuit breaker trips cleanly without affecting the rest of your home. This is the correct way to do it — no shortcuts.
At Pip Electrics, we hold both a Queensland Electrical Contractor Licence and our tradespeople are fully licensed electricians. We handle the full installation including the electrical circuit — nothing gets subcontracted or left for someone else to finish.
Multi-Head Systems — When Do They Make Sense?
A multi-head system uses one outdoor condenser to serve multiple indoor units — typically two, three, or four heads throughout the house. They're often marketed as a cost-saving alternative to multiple single-split systems, but the reality is more nuanced.
Multi-head systems make good sense when:
- You want to cool three or four rooms and there's limited space or aesthetic preference for a single outdoor unit
- Your outdoor area (such as a narrow side passage or small courtyard) can only accommodate one condenser
- You're doing a new build or major renovation where concealed line sets are possible
The trade-off is that multi-head systems are generally less efficient than multiple single splits — the shared outdoor unit has to do more work, and if it fails, all the indoor units stop working. For most Sunshine Coast homes with three or more bedrooms, we often find individual single-split units per room give better flexibility and redundancy, especially if you're not running all zones simultaneously.
It really comes down to your layout, how many rooms you're cooling, and your budget. We'll give you an honest recommendation based on your specific situation.
Inverter Technology — What It Actually Means
Every reputable brand now sells inverter-driven split systems as standard, but it's worth understanding what that means and why it matters.
Older (non-inverter) systems ran at a fixed speed — either flat-out or off. To maintain a set temperature, they'd cycle on and off repeatedly. This is inefficient, hard on the compressor, and creates noticeable temperature swings in the room.
An inverter-driven compressor varies its speed continuously, ramping up when it needs to work hard and slowing down to a low idle once the room is at temperature. The result is lower running costs (typically 30–50% more efficient than older fixed-speed units), quieter operation at the lower end, and much more stable temperature control. For Queensland's long cooling seasons, the energy savings add up significantly.
All the brands we install — Daikin, Mitsubishi Electric, Fujitsu, Panasonic, and LG — use inverter technology as standard across their residential ranges. The differences between them are in reliability track records, warranty terms, noise levels, and filter technology. We're happy to discuss which suits your situation.
Sunshine Coast–Specific Considerations
Salt Air Near the Coast
If your property is within a couple of kilometres of the beach — Mooloolaba, Kawana, Bokarina, Coolum, Peregian — you need to think about salt air corrosion. Standard outdoor units can corrode surprisingly quickly in a coastal environment. We recommend units with gold-fin or pre-coated condenser coils designed for coastal installation, and we factor this into our recommendations. A unit that's not suited to coastal conditions can fail within a few years — and that's a warranty issue that isn't always covered.
Heat Loads on the Sunshine Coast
The Sunshine Coast climate is genuinely warm for much of the year. We're not talking Darwin-level heat, but our summer humidity combined with afternoon temperatures in the low-to-mid 30s creates significant cooling loads. We generally recommend sizing up rather than to the minimum for our climate — a unit that's working at 70–80% capacity will be quieter, more efficient, and last longer than one running flat-out every afternoon.
What to Look for in an A/C Installer
Not all installers are equal, and the cheapest quote isn't always the best outcome. Here's what actually matters:
- Licensed electrician: Your installer must hold a Queensland electrical contractor licence to do the electrical connection legally. Ask for the licence number.
- ARCtick certification: Refrigerant work requires an ARCtick licence. Without it, the person handling your refrigerant is working illegally.
- Does their own electrical work: If an installer subcontracts the electrical connection, you have two parties, two schedules, and potentially two people pointing at each other if something goes wrong. Look for someone who handles the complete job.
- Honest sizing advice: If someone quotes you the cheapest, smallest unit without asking about your room, ceiling height, or sun exposure, they're not doing proper load assessment.
- Warranty support: A good installer will back their installation work, not just hand you the manufacturer's warranty and disappear.
We install Daikin, Mitsubishi Electric, Fujitsu, Panasonic, and LG units — brands with strong warranty support and proven reliability in Australian conditions. Our team handles everything from the initial sizing advice through to the electrical circuit, refrigerant line set, commissioning, and sign-off.
- Daikin
- Mitsubishi Electric
- Fujitsu
- Panasonic
- LG
If you're on the Sunshine Coast and thinking about a split system — whether it's a single room or multiple zones — give us a call. We'll give you straight advice on sizing, placement, and which unit suits your situation, and we'll do the full installation properly from start to finish.