Split System Installation Cost Perth (2026)

A customer in Canning Vale called us in February with a quote on her phone she couldn’t make sense of. The ad said “split systems from $1,499 fully installed”, but the written quote for her bedroom came back at $2,650. She wanted to know whether she was being ripped off, or whether the ad was the catch. The honest answer covers most of this guide: the split system air conditioning installation cost you actually pay depends far more on your house than on the sticker price in the ad.

This is a plain-English 2026 price guide for Perth. We’ll cover what a single-head split typically costs supply and installed, broken down by kW and room size, what multi-head systems run, exactly what’s in a standard install, and the variables that push the number up or keep it down. Real Perth ranges, no guarantees, no sales fluff.

Quick note before you read on: if you want a real number for your specific room and wall, book a free quote. We’ll measure the space, check the wall and switchboard, and give you the whole job in one price, upfront and fixed.

What a single split system air conditioner costs in Perth

Let’s start with the number most people want. The split system air conditioning installation cost for a single head, supply and installed, typically lands between $1,500 and $4,500 in Perth as of mid-2026. That’s GST included and covers a standard back-to-back install on a value-to-mid brand.

The spread is wide because two things move together: the size of the unit (its kW rating) and how hard the install is. A small 2.5kW unit going on an easy single-storey wall sits at the bottom of that range. A 7kW or 8kW unit on a tricky wall sits well up it.

Here’s how the cost to install a split system breaks down by room size. These are realistic Perth ranges for a standard install, not guarantees.

Split system air conditioner price by kW and room size (Perth)

Unit size	Suits	Typical room	Supply + installed (standard)
2.5kW	Small bedroom, study, nursery	up to 20 m²	$1,820 to $2,400
3.5kW	Standard bedroom, small living	20 to 30 m²	$2,020 to $2,900
5.0kW	Master, open-plan living	30 to 45 m²	$2,550 to $3,600
7.0kW to 8.0kW	Large open-plan living/kitchen	45 to 65 m²	$2,960 to $4,500

A few things to read into that table. The jump from 2.5kW to 5kW isn’t huge on the supply side, and the install labour is similar, so it often makes sense to size up a notch rather than buy a unit that runs flat-out every Perth summer. An undersized split working at 100% all day costs more to run and wears out sooner.

What a standard back-to-back install actually includes

“Supply and install” should mean the lot, but it pays to know what a standard back-to-back install covers so you can read a quote properly. Back-to-back means the indoor head and the outdoor unit sit on opposite sides of the same wall: the simplest, cheapest layout. When we quote a supply and install split system in Perth, this is the baseline, and a proper one includes:

• The indoor head and outdoor unit, mounted, levelled, and secured.
• Up to 3 metres of refrigerant pipework between the two units, insulated and run in neat trunking outside.
• The electrical connection to a nearby existing circuit, with an isolating switch fitted within sight of the outdoor unit (a Wiring Rules requirement).
• Condensate drain, run straight down to ground level at the outdoor unit unless your layout calls for something different.
• Mounting for the outdoor unit: standard is a set of 100mm plastic mounting blocks at ground level, or a wall bracket where that’s specified.
• Vacuum, pressure test, and refrigerant charge to the manufacturer’s spec, then a full run test in cooling or heating.
• Commissioning and a demo of the remote, plus the compliance paperwork.

That last part matters more than people think. The vacuum and pressure test is where a cheap, rushed install goes wrong: skip it and you get an under-performing unit that fails years early. For a fuller rundown of the process, see our split system installation page.

A quote will usually spell out three things, because they’re what move the price most: the maximum pipe length included, the maximum power (cable) run, and the drain location. If yours doesn’t mention them, ask. That’s where day-of “extras” tend to hide.

Multi-head split system cost

A multi-head (or multi-split) runs two or more indoor heads off a single outdoor unit. People reach for it to save wall space and avoid a row of outdoor boxes down the side of the house. It’s a tidy solution, but it’s worth knowing the multi-head split system cost honestly before you commit.

As a rough rule, a two-head system starts around $4,500, and each extra indoor head adds roughly $1,500 in unit and labour. Supply and installed, the Perth ranges look like:

• Two-head system: typically $4,500 to $6,000.
• Three-head system: typically $6,000 to $7,500.
• Four-head system: typically $7,500 to $9,000.
• Five-head system: typically $9,000 to $11,000+.

Here’s the catch most installers won’t volunteer. A multi-head is often more expensive than the same number of separate single splits, not less. The outdoor unit and the longer pipe runs cost more, and if one outdoor unit fails, every room it feeds goes down at once. Separate splits also let each room run independently and at its own efficiency.

The genuine case for multi-head is when you’ve only got one spot for an outdoor unit: a small courtyard, a strata wall, a townhouse with no side access. If you’ve got room for separate outdoor units, individual splits usually win on price, redundancy, and running cost. We’ll tell you which way your house leans at the quote.

What pushes the split system installation cost up (and what keeps it down)

The advertised “from” price assumes the easiest possible job. Most real Perth homes have at least one thing that lifts it. None of these are rip-offs, they’re real labour and materials.

Long pipe runs

Back-to-back is cheapest. The moment the outdoor unit has to sit a fair way from the indoor head (around the corner, down the side, up on the roof) you’re paying for extra insulated copper, extra refrigerant, and the labour to run it neatly. Long runs typically add $300 to $900+, depending on distance and whether it’s getting concealed in a wall or roof cavity.

Two-storey or high mounting

Getting an indoor head onto an upstairs wall, or an outdoor unit onto a first-floor bracket or roof, means working at height, sometimes with scaffold or a longer ladder set-up and a second person. Expect a height or two-storey job to add $300 to $800 over the equivalent ground-floor install.

Limited or awkward access

A tight roof cavity, no side access, or a unit that has to go where the cabling run is awkward: all of it is time. Difficult access typically adds $200 to $600.

Premium brand tier

Stepping from a value brand up to a premium one (think Panasonic or Daikin) in the same kW class usually adds $400 to $1,200 on the supply side. You’re paying for quieter operation, better build, and a stronger warranty network across Perth. Worth it for a living-area unit that’ll run hard for years, less critical for a spare bedroom.

Electrical work: a new circuit or switchboard

This is the one pure-aircon installers tend to leave off. Smaller units (up to 3.5kW) can often run off a suitable existing circuit, but anything larger than 3.5kW needs its own dedicated circuit run from the switchboard. An older home that’s already at capacity may need switchboard work on top.

Signs your switchboard might need attention: ceramic fuses instead of circuit breakers, no safety switches (RCDs), or a board with no spare positions left. A dedicated circuit typically adds $300 to $700, and switchboard upgrades range widely depending on scope. We cover the detail in our switchboard upgrade guide.

What keeps the cost down

Just as useful to know what holds the price at the lower end:

• A true back-to-back wall on a single-storey home, no long runs, no height. This is the cheapest standard install.
• A recent switchboard with a spare circuit. A board installed in the last 10 to 15 years usually has the capacity and protection a split needs.
• A value-tier or mid-tier brand in the right size for the room. Current-generation inverter units from value brands are genuinely good now.
• An easy outdoor unit position at ground level on a slab or wall bracket, with clear access.
• Booking outside peak season. Calendars are jammed from October to January. Quote in autumn (April to June) or late winter and there’s more room to price keenly.

Tick most of those and a small to mid-size single split can land near the bottom of the range.

The “from $X” advertised-price traps

Back to the Canning Vale quote. “Split systems from $1,499 fully installed” isn’t necessarily dishonest, but it’s built on best-case assumptions that rarely match a real home. Watch for these:

• The smallest unit only. The “from” price is usually a 2.5kW unit. Your living area needs 5kW or 7kW, which is a different price entirely.
• Strict back-to-back only. Any extra pipe, height, or access is charged on top, often not mentioned until install day.
• No electrical allowance. If a new circuit or isolator is needed, that’s “extra”, or worse, skipped and left non-compliant.
• A brand you’ve never heard of, with no local warranty support when it fails in a few years.
• Removal and make-good excluded. Taking the old unit away, patching the wall, or reinstating insulation can all be add-ons.

A real quote names the unit, the size, the pipe run, the electrical work, and what’s not included. If it doesn’t, you can’t compare it to anything. Ask for the lot in writing before you sign.

Why a licensed installer matters

A split system isn’t a TV bracket. There are two licences involved, and a proper job needs both.

First, refrigerant handling is regulated. Anyone opening up the refrigeration circuit must hold an ARC (Australian Refrigeration Council) licence. It’s a legal requirement, and it’s there because refrigerant is a potent greenhouse gas and a botched charge wrecks the system. You can check any installer’s licence on the ARCtick public register.

Second, the electrical connection, the isolator, and any new circuit or switchboard work must be done by a licensed WA electrician. An unlicensed connection isn’t just unsafe, it can void your home insurance and the manufacturer’s warranty.

Otter Air & Electrical holds both: an ARC refrigerant licence and a WA electrical contractor’s licence (EC16559 / AU064616). That means the split, the wiring, the isolator, and any switchboard work all come from one team, on one quote, with one warranty. No second tradie, no hand-off, no surprise bill mid-job. Going with a back-yarder to save a couple of hundred dollars is the kind of saving that costs you when the warranty claim gets knocked back.

Finance and spreading the cost

A single split is a manageable spend for most households, but a multi-head or a couple of units at once adds up. We offer a low-rate finance option so you can spread the cost rather than wait out another Perth summer with no aircon.

For a lot of customers the maths works out fine: a monthly payment over 12 to 24 months, with the comfort starting day one instead of “next pay”. If that suits you better than paying upfront, have a look at our finance options or just mention it when we quote.

Frequently Asked Questions

How much does it cost to install a split system in Perth?

A single-head split typically costs $1,500 to $4,500 supply and installed in Perth, depending on the unit’s kW size, the brand, and how easy the install is. A small bedroom unit sits at the lower end; a large living-area unit with a tricky run sits higher.

Is the “from $1,499 installed” advertised price real?

It’s usually real for the smallest unit on a perfect back-to-back wall, but it rarely matches a real home. Once your actual room size, pipe run, mounting, and any electrical work are measured, the genuine split system air conditioning installation cost is almost always higher.

Is a multi-head split cheaper than separate splits?

Often no. A multi-head split system cost usually runs higher than the same number of separate single splits, because the outdoor unit and longer pipe runs cost more. Multi-head mainly makes sense when there’s only one spot for an outdoor unit.

What size split system do I need for my room?

As a rough Perth guide: 2.5kW suits a room up to about 20 m², 3.5kW for 20 to 30 m², 5kW for 30 to 45 m², and 7kW or more for large open-plan spaces. Proper sizing also factors in window orientation, insulation, and ceiling height. For a quick estimate on your own room, try our room size calculator.

Does a split system need its own electrical circuit?

A small split (up to 3.5kW) can often run off an existing circuit, but anything larger than 3.5kW needs its own dedicated circuit from the switchboard, sometimes with switchboard work too. That’s why a dual-licensed installer quotes the aircon and the electrical together, with no surprises on the day.

Is reverse cycle split heating expensive to run in winter?

Not particularly. Reverse cycle moves heat rather than generating it, so it’s far more efficient than plug-in heaters. The Australian Government’s energy.gov.au heating and cooling guide rates modern reverse cycle systems well above 300% efficiency, which makes winter running cost very manageable in Perth’s mild climate.

Ready for a real number on your house?

We’ll come out, measure the room, check the wall and your switchboard, and quote the whole job (the split, the electrical, the isolator, and the compliance) in one price. Free and no-obligation, and most quotes are turned around within 24 hours.

Get your free Perth split system quote

If you’ve already got a quote and want a second opinion on whether it’s fair, send it through. Happy to take a look at no charge, or browse the systems we supply to get a feel for what suits your place. You can also call Matt directly on 0434 951 341.

---

Written by Matt Grossmith, owner of Otter Air & Electrical. Matt is ARC-licensed for refrigerant work and holds a WA electrical contractor’s licence (EC16559 / AU064616). 10+ years installing and servicing residential air conditioning across Perth.