If you need more than one room cooled and heated but don't want an outdoor unit for every single indoor unit — or you don't have the ceiling space or budget for a full ducted system — a multi-split air conditioner is usually the answer. One outdoor condenser unit powers multiple indoor units placed in different rooms, giving you independent control of each space without cluttering the exterior of your home or business with several separate outdoor units.
We install multi-split air conditioning systems across Perth for homeowners, renovators, landlords, and small businesses that need several rooms covered efficiently. Every installation is carried out by licensed technicians, with the system sized and configured around your specific property rather than a generic template.
A multi-split system works on the same basic principle as a standard split system, but instead of one outdoor unit connecting to a single indoor unit, one larger outdoor condenser connects to two, three, four, or more indoor units, each installed in a different room. Every indoor unit can typically be controlled independently, meaning you can run the living room and a bedroom at different temperatures, or leave unused rooms switched off entirely while cooling or heating only the spaces you’re in.
This makes multi-split systems a middle-ground option between installing several individual single-split systems and committing to a full ducted system with concealed ductwork throughout the ceiling.
Rather than three or four separate outdoor condensers taking up space along an exterior wall, a multi-split system consolidates everything into a single, larger outdoor unit.
Each indoor unit operates on its own settings, so different family members or different areas of a business can run their own temperature preferences without affecting other rooms.
Like standard split systems, multi-split systems don't need ceiling ductwork, which makes them well suited to homes without existing duct infrastructure, or where a full ducted retrofit isn't practical or affordable.
Installing one multi-split system with three or four indoor heads is often more cost-effective than installing three or four completely separate single-split systems, both in equipment and installation labour.
Multi-split systems aren't limited to wall-mounted heads — depending on the brand and model, you can often mix in ceiling cassette, floor-standing, or ducted-style indoor units on the same outdoor condenser.
If you're extending a home or renovating room by room, a multi-split system lets you plan indoor units for each space while sharing a single outdoor unit sized for the whole job.
We visit your property and assess every room you want covered — sizes, ceiling heights, window orientation, insulation, and how the rooms are used day to day.
This is the step that makes or breaks a multi-split installation. We calculate the combined cooling and heating load across all the rooms being connected, then size the outdoor unit and each indoor head correctly. Getting this wrong — undersizing the outdoor unit for the combined load, in particular — is one of the most common mistakes in multi-split installations, and it results in a system that can't keep up when every room is running at once.
We plan indoor unit placement in each room and determine the most practical, least intrusive route and location for the outdoor condenser, factoring in pipe run lengths between the outdoor unit and the furthest indoor head.
You'll receive an itemised quote covering the outdoor unit, each indoor head, installation labour, and any additional electrical or structural work required.
Our licensed technicians install the outdoor condenser and each indoor unit, run and insulate the refrigerant piping to every room, complete the electrical work, and pressure-test the full system for leaks.
We test every indoor unit individually and in combination, confirm airflow and drainage at each location, and walk you through operating the system — including any centralised or app-based controls if your chosen system supports them.
Most multi-split outdoor units support anywhere from two to five indoor units, depending on the brand and model, with larger commercial-grade outdoor units supporting more. The right number of indoor heads for your property depends on which rooms you actually want climate-controlled — we don’t recommend paying for more capacity than you’ll use, but we also make sure the outdoor unit has enough headroom to run every connected room comfortably at the same time, not just one or two of them.
This is one of the most common questions we get asked, and the honest answer is that it depends on the property and how you use it.
Multi-split systems tend to suit homes where you want a handful of specific rooms covered (rather than the entire house), where ceiling space for ductwork is limited, where the home doesn’t have existing ductwork and a full retrofit would be costly, or where you want the flexibility to run different rooms at different temperatures without complex zoning.
Ducted systems tend to suit larger homes where most or all rooms need climate control, where a clean, no-visible-unit aesthetic is a priority, and where the budget supports the higher upfront cost of ductwork and a larger central unit in exchange for whole-home coverage.
We’ll give you an honest comparison during your site assessment rather than steering you toward whichever system happens to be more profitable for us to install.
We factor all of this into your free quote after the site assessment, so the figure you receive reflects the real scope of your specific installation.
We install multi-split air conditioning systems across the greater Perth metro area, covering homes and businesses in the northern suburbs, southern suburbs, eastern corridor, and inner-city precincts. Get in touch to confirm coverage for your property.
Most residential multi-split outdoor units support between two and five indoor units, though this varies by brand and model. We'll recommend a configuration based on how many rooms you want covered and the combined capacity required.
Generally, yes. Sharing one outdoor unit across several indoor heads typically costs less in both equipment and installation labour than installing multiple completely separate single-split systems, though the exact saving depends on the specific rooms and layout involved.
Yes. Each indoor unit on a multi-split system typically operates independently, so different rooms can run at different temperatures, or be switched off entirely, without affecting the others.
No. One of the advantages of a multi-split system is that you can run just one indoor unit if that's all you need, rather than heating or cooling the whole house.
Yes, because all indoor units share the same outdoor condenser, a fault with the outdoor unit will affect every connected room. This is one of the trade-offs compared to fully separate single-split systems, and it's why correct sizing and quality installation matter even more with multi-split systems.
This depends on whether the existing outdoor unit has spare capacity for additional indoor heads. We can assess your current system and advise whether an expansion is feasible or whether a larger outdoor unit would be needed.
This depends on the number of indoor units and the complexity of the pipe runs, but most residential multi-split installations with three to four indoor heads are completed within one to two days.
If you need several rooms in your Perth home or business covered without cluttering the exterior with multiple outdoor units, get in touch for a free site assessment and quote. We’ll assess your property, recommend the right configuration, and install it properly from day one.
Contact us today for a free quote on multi-split air conditioner installation across Perth.
