Air Conditioning Installation Cost: What Actually Changes the Price

There is no single price for air conditioning installation, and any number given over the phone before someone has seen the job is a guess. What you pay to have a split system installed comes down to three things: how far the indoor unit sits from the outdoor unit, what capacity the space actually needs, and whether your switchboard can take the load or has to be worked on first. A back to back install, where the indoor head is fixed directly opposite the outdoor unit on the other side of the same wall, is the cheapest configuration there is. Everything else adds pipe, labour and time. The other trap is the price on the ticket at a retailer. That is the cost of the box. Installation is a separate job with its own price, and what it covers varies a lot between installers. Read the quote, not the ad.

Two quotes for the same house can land a long way apart and both can be honest. The gap is almost always in what each one includes. If a quote is one number and one sentence, you have nothing to compare. Ask for it in pieces.

A back to back install has the indoor head on an external wall with the outdoor unit sitting directly behind it. The pipe run is barely longer than the wall is thick. One penetration, a short cable run, drain straight out. Nothing about it is awkward, which is why it is the cheapest way to put a split system in and why most advertised installation prices quietly assume it.

Plenty of houses do not offer that wall. The indoor unit needs to go where the air will actually reach the room, and the outdoor unit needs airflow, service access, and somewhere that is not under a bedroom window. The moment those two points move apart, the job grows: more pipe, more cable, more drilling, more refrigerant.

None of these are upsells. They are why a fixed price quoted sight unseen tends to grow once someone turns up.

Capacity is the other half of the price, and it is the part people guess at off a shelf tag. Undersize it and it runs constantly on the days you bought it for, never quite gets there, and uses more power doing it. Oversize it and it hits the set temperature fast, shuts down, starts again minutes later, and never runs long enough to pull humidity out. Short cycling wears the compressor and leaves the room clammy.

The way past the guess is a load calculation, done room by room. We work from room dimensions and ceiling height, insulation, window area and which way that glass faces, and the climate the house sits in. A big west facing window in Murray Bridge is a very different heat load from the same window facing south. That calculation also settles whether one larger head does the job or the layout really needs two smaller ones.

An air conditioner normally runs on its own dedicated circuit. If the switchboard has no spare way, still has ceramic rewireable fuses, or lacks residual current protection where it should have it, that work has to happen before the system can be connected. That is electrical work, priced separately from the unit.

This is the most common reason an installed price changes after someone actually looks. If your board is original to the house, read up on safety switches and RCD protection before you collect aircon quotes, because that work may be due anyway.

A single split is one indoor head to one outdoor unit, and for one room or an open living area it is usually the sensible choice.

A multi-head system runs several indoor heads off a single outdoor unit. For the same total capacity it costs more than one split, because there are more indoor units, more pipe runs back to the one outdoor unit and more labour getting them there. It earns its place where several rooms need conditioning and there is one workable spot outside.

Ducted is a different order of job. It needs ceiling space for the indoor fan coil and the duct runs, penetrations for the outlets, a return air grille, and usually zoning so you are not conditioning the whole house to cool one bedroom. Roof pitch and access decide whether it is practical at all, so ducted is far easier in a new build or a renovation than retrofitted into a shallow roof space. The price follows the duct layout and the zone count more than the capacity.

The phrase means different things to different companies. These items most often sit outside the headline price.

Murray Bridge regularly runs past 40 degrees in summer, and a run of those days is the real test. A unit chosen against a mild afternoon will spend February flat out and still be behind. In the Adelaide Hills the other end matters just as much, with winter nights getting close to freezing and a reverse cycle split doing all the heating in a lot of houses.

Heating capacity falls away as the outdoor temperature drops, which is precisely when you are asking the most of it. So the sizing has to be checked at both ends: the worst summer afternoon and the coldest winter morning. A cheap quote is often cheap because it was sized for neither. The question is the same in Murray Bridge, Mannum and Tailem Bend as it is up the hill in Mount Barker, Hahndorf, Nairne or Strathalbyn.

You do not need to know the trade to ask these. Notice which installer answers without going away to check.

There is no headline figure in this article because a headline figure would be fiction. Two houses on the same street can take the same unit for very different money, one with a clean back to back wall and a modern board, the other with a long run through a stone wall and fuses from the seventies.

We supply and install split systems and ducted, we do the load calculation properly, and being licensed electricians we can price the switchboard side at the same time rather than sending you elsewhere halfway through. See our air conditioning services, ring 0438 840 121, or send the details through the contact page.