Air Conditioning May 04, 2026 6 min read

Split System Air Conditioning Installation in Melbourne: Full HVAC Service

Installing a split system air conditioner in Melbourne typically costs **A$2,200–A$5,500** supplied and installed — covering the indoor and outdoor units, refrigerant lines, mounting, electrical work, and Certificate of Electrical Safety. Carbon Group Electrical handles the complete HVAC installation in-house under our REC, A-Grade and ARCtick licences.

Carbon Group Electrical technician completing a full HVAC split system air conditioner installation in Melbourne

Frequently asked questions

Book Your Full HVAC Installation

Licensed, local, and turn up when promised. Carbon Group Electrical — REC 35801.

Call 0468 403 129 Request a quote

Written by Brandon Loebert, Registered Electrical Contractor (REC 35801), Carbon Group Electrical, Melbourne.

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Installing a split system air conditioner in Melbourne typically costs between A$2,200 and A$5,500 supplied and installed for a standard residential job — covering the indoor and outdoor units, refrigerant pipework, mounting, electrical work, and Certificate of Electrical Safety. Carbon Group Electrical handles the complete HVAC installation in-house: electrical, refrigerant, and mounting — under the one team, with the one warranty.

Full HVAC Install vs Electrical-Only — What's the Difference?

A split system air conditioner needs two separate licensed trades:

Electrical work — dedicated circuit, isolator switch, supply wiring, and Certificate of Electrical Safety — carried out under a Registered Electrical Contractor (REC)
Refrigerant handling — connecting, vacuuming and pressure-testing the copper refrigerant lines — requires an ARCtick licence

Many electricians only do the electrical side, leaving you to coordinate a separate refrigeration mechanic for the rest. Carbon Group Electrical holds REC 35801, A-Grade Electrical Licence A62716, and ARCtick L186818 — meaning we can quote, supply, mount, pipe, wire, commission, and certify the entire system from start to finish.

What's Included in a Full HVAC Installation?

A complete supply-and-install job from Carbon Group Electrical includes:

Site assessment — sizing the system to the room (kW), checking switchboard capacity, and planning the indoor and outdoor unit positions
Supply of equipment — quality split system from brands such as Mitsubishi Electric, Daikin, Fujitsu, or Panasonic
Mounting — wall bracket for the outdoor unit, mounting plate for the indoor head, and condensate drain
Refrigerant lines — insulated copper pipework, vacuumed and pressure-tested under our ARCtick licence
Electrical work — dedicated circuit from the switchboard, isolator switch within sight of the outdoor unit, and supply to the indoor unit
Commissioning — system charge check, full operational test in heating and cooling modes
Certificate of Electrical Safety (COES) issued and lodged

Typical Costs for a Split System in Melbourne (2026)

Pricing varies with system size and complexity, but for a standard residential install:

2.5 kW system (small bedroom or study): A$2,200–A$3,000 supplied and installed
5.0 kW system (living room, master bedroom): A$2,800–A$4,200 supplied and installed
7.0–8.0 kW system (large open-plan living): A$3,800–A$5,500 supplied and installed
Long pipe runs (>5 m), high access, or upper-storey installs: add A$300–A$900

If you have already bought your own unit, we can install it on a labour-only basis. The electrical-only component (where another business is doing the refrigerant side) typically costs A$300–A$800.

Sizing — Why It Matters

Choosing the right kW capacity is one of the biggest factors in your unit's lifetime running cost. An undersized unit will run flat-out and never reach setpoint; an oversized unit will short-cycle and dehumidify poorly. As a rough guide for Melbourne homes:

Up to 20 m² — 2.5 kW
20–35 m² — 3.5–5.0 kW
35–50 m² — 5.0–7.0 kW
50–70 m² — 7.0–9.0 kW

Insulation level, ceiling height, window orientation, and the number of occupants all change the answer — we confirm the calculation on site before quoting.

What Does the Electrical Side Involve?

Dedicated Circuit

Every fixed air conditioner must have its own dedicated circuit — it cannot share wiring or a circuit breaker with other appliances or light fittings. This circuit runs from the switchboard to the indoor unit's electrical connection point.

Isolator Switch

Australian wiring rules (AS/NZS 3000) require an isolator switch within sight of the outdoor compressor unit. This allows the unit to be safely de-energised for service or in an emergency, without needing to access the switchboard.

Switchboard Capacity

Older switchboards may not have a spare circuit position, or may use ceramic fuses without RCD (safety switch) protection. In these cases a switchboard upgrade is required before the air conditioner circuit can be added.

Refrigerant Side — Why ARCtick Matters

Refrigerant gas (typically R32 in modern systems) is a controlled substance under the Ozone Protection and Synthetic Greenhouse Gas Management Act 1989. Anyone handling it must hold a current ARCtick licence — it is illegal for an unlicensed person to break refrigerant lines, vacuum, charge, or recover gas.

The refrigerant work involves:

Cutting, flaring and brazing copper pipework
Pressure-testing with dry nitrogen to confirm no leaks
Vacuuming the lines to remove moisture
Releasing the factory pre-charge or topping up where pipe runs exceed manufacturer limits
Logging the charge for environmental compliance

A poor refrigerant install — even with perfect electrical work — will cause poor performance, premature compressor failure, and warranty issues. Doing both trades in-house means we own the result end-to-end.

Compliance — Certificate of Electrical Safety (COES)

Under the Electricity Safety Act 1998, all electrical installation work in Victoria must be certified with a Certificate of Electrical Safety. The REC issues this on completion. Air conditioning electrical work is generally classified as non-prescribed, so it does not require an independent inspection — but the COES is still mandatory.

If you are selling the property, your conveyancer will often ask for COES records on recent installation work. Keep your copy.

Common Mistakes We See on Other Installs

No isolator switch at the outdoor unit — non-compliant with AS/NZS 3000
Daisy-chained circuits — air conditioner sharing a circuit with lights or general power
Undersized cabling — voltage drop on long runs causing nuisance tripping
No COES issued — leaves the homeowner liable in the event of an incident
Poor refrigerant vacuum — moisture in the lines damages the compressor over months
Missing condensate drain or incorrect fall — water damage to walls and ceilings

Booking Your Installation

Carbon Group Electrical services Melbourne's eastern suburbs — Blackburn, Box Hill, Camberwell, Doncaster, Vermont, Mitcham, Bayswater and surrounding areas. We typically book in within the same week, and most residential installs are completed in a single day.

For a quote on a full HVAC install — supply, mount, pipework, electrical, COES — call +61 468 403 129 or email carbon.group@outlook.com. We will measure up, recommend the right system size, and give a fixed price before any work starts.