Split system air conditioner installation in Epping

A supplied and installed 2.5 kW split system in Melbourne is listed at $1,250 to $2,625 in a published October 2026 cost guide, and a 5 kW living room unit at $1,900 to $3,675. Where the job lands in that range depends mostly on the length of the refrigerant pipe run, the wall the outdoor unit sits on and whether the switchboard needs a new circuit. In Victoria the refrigeration side is plumbing work regulated by the Building and Plumbing Commission (BPC), and the electrical connection is regulated by Energy Safe Victoria.

What is a split system and when does it suit?

A split system has an indoor head on the wall and an outdoor compressor unit, joined by insulated copper refrigerant pipes, a condensate drain and a power and control cable. A reverse cycle model heats in winter and cools in summer. A single split suits one room or one open plan area. Where a family wants three or four rooms done, a multi-split or a ducted reverse cycle system is usually compared against several separate splits.

Choosing the right size

The Victorian Government’s guide to choosing a reverse cycle air conditioner warns against both mistakes. A unit that is too small struggles on the hottest and coldest days. One that is too large costs more to buy, can cost more to run and tends to swing the room temperature around. The same guide notes that Victorians use more energy heating than cooling, so the heating rating deserves as much attention as the cooling figure.

A provider sizing a room will want to know:

• floor area and ceiling height (ceilings above the standard 2.4 m need more capacity)
• which way the windows face and whether they are single glazed
• whether the ceiling is insulated and how draughty the room is
• brick veneer, double brick or lightweight cladding
• whether the room opens onto a kitchen or stairwell that the unit will also be trying to condition

Typical sizes and published prices

Room in an Epping house	Size	Fitted price
Kid’s room or home office	2.5 kW	$1,250 to $2,625
Main bedroom or compact lounge	3.5 kW	$1,475 to $2,950
Typical family room	5 kW	$1,900 to $3,675
Lounge and dining together	7 kW	$2,300 to $4,725
Open plan kitchen and living	9 kW	$3,150 to $5,800

If you have already bought the unit, the same guide lists installation only at $735 to $1,575. Swapping an old split for a new one in the same position, with the old unit taken away, is listed at $1,575 to $3,150. All figures come from the Melbourne air conditioning cost table published by What’s The Damage, which states that prices include GST. Our Epping air conditioning cost guide explains what pushes a quote to the top of each band.

What the installer will check on site

A standard back to back install puts the indoor head on the inside of an external wall with the outdoor unit directly behind it. Costs rise when the pipes have to travel through a roof space, under a floor or around to a side fence. Before quoting, an installer will check:

• where the condensate drain can discharge without staining paths or pooling against the slab
• whether the outdoor unit can sit on a level pad or wall bracket with clear airflow around it
• the distance to the switchboard and whether there is a spare circuit
• how close the outdoor unit will be to a neighbour’s bedroom window
• whether a two storey install needs scaffolding, a ladder platform or roof access

The last point matters more than people expect. Under the EPA’s residential noise rules, which come from the Environment Protection Regulations 2021, cooling noise from your unit should not reach a habitable room next door on weekdays before 7 am or after 11 pm, or on weekends and public holidays before 9 am or after 11 pm. Heating use has an earlier 10 pm cut off. The rules are relaxed during a heat health warning. Placing the compressor away from a side boundary avoids most complaints.

Licences and the paperwork you should receive

Three separate checks apply to a split system install in Victoria:

1. Refrigeration work. Installing and commissioning a split system is refrigerated air-conditioning work under the Plumbing Regulations 2018. The BPC also offers a restricted class. Its scope is single head splits rated to 18 kW cooling, plus ceiling cassette units and the add-on condensers fitted to ducted systems. Anyone registering in that restricted class must hold an ARCtick refrigerant handling licence.
2. Plumbing compliance certificate. On an Epping split install, the licensed plumber owes you a compliance certificate under Part 12A of the Building Act 1993 whenever the job’s total value, with the appliance, materials, labour and GST all counted, exceeds the threshold shown on the BPC compliance certificate page. Most supplied and installed splits are over it. The certificate is due to you within five days of the work finishing.
3. Electrical certificate. The power connection must be done by a licensed electrician or registered electrical contractor, who completes a Certificate of Electrical Safety under the Electricity Safety Act 1998 and gives you a copy. Energy Safe Victoria explains the timing on its certificates page for the community.

Whether one business holds both licences or brings in an electrician, you should end up with both certificates.

What a careful installer will not skip

• Pressure testing the pipework with nitrogen and pulling a vacuum before releasing refrigerant into the system.
• Sealing and flashing the wall penetration so water cannot track inside.
• Fitting the outdoor unit to a stand or bracket rated for its weight.
• Insulating both refrigerant lines along their full length.

Be wary of a quote that leaves out the electrical connection, or one that suggests a handyman can fit the indoor head while someone else “gases it later”. The BPC class definition treats the whole installation and commissioning as one job.

The Epping angle

The City of Whittlesea’s community profile records significant development in Epping during the 1980s and 1990s, so plenty of detached homes here are now old enough for their first or second cooling upgrade. On a single storey house with a roof space, the pipe run is usually the simple part. Newer townhouses and apartments around the Epping activity centre are a different job. A balcony or roof mounted outdoor unit may need body corporate approval, and noise travels further between closely packed homes. If you live in one of those buildings, check the owners corporation rules before you pick a spot.

If you are replacing a gas wall furnace or column heater at the same time, read the reverse cycle upgrade guide first, because a government discount may apply only when it is arranged before the work starts. Homes in nearby Lalor are older and can involve asbestos checks before anyone drills the walls.

What to do next

Write down the room size, ceiling height and the wall you would like the indoor head on, and take a photo of the outside wall and your switchboard. Then send your split system details through the quote form. Your enquiry goes to an independent local installer, who decides whether to take the job and gives you their own price and terms.

Send a job enquiry