A back to back split system install on a single storey home typically costs $700 to $1,400 inc GST for labour, on top of the unit. Longer pipe runs, upstairs installs and difficult wall access push it higher. The unit itself usually adds $900 to $2,600 depending on capacity.
Typical install labour: $700 to $1,400 inc GST
Back to back install, single storey: $700 to $1,000. Indoor and outdoor unit on the same wall
Standard install with 3 to 5m pipe run: $900 to $1,400. Most common suburban job
Upstairs or high wall install: add $250 to $600. Scaffold or extended ladder work
Extra pipe run beyond 5m: $60 to $110 per metre. Insulated line set and drain
New dedicated circuit: $450 to $900. Licensed electrician, larger units
Remove and dispose of an old unit: $150 to $350. Degassing must be done legally
2.5kW unit supplied: $900 to $1,300. Bedroom or small living room
7.1kW unit supplied: $1,900 to $2,600. Open plan living
Sizing the unit to the room
As a rough Melbourne guide, a bedroom of around 12 to 20 square metres suits a 2.5kW unit, a medium living room of 20 to 35 square metres suits 3.5 to 5kW, and an open plan living and kitchen of 35 to 60 square metres needs 6 to 7.1kW.
West facing glass, high ceilings, poor insulation and a top floor all push the required capacity up. If the room bakes in the afternoon, size up rather than down.
What a compliant install includes
Refrigerant work must be done by a technician with an ARC licence, and any new wiring by a licensed electrician with a Certificate of Electrical Safety. Both matter for your warranty. Most manufacturers void the unit warranty if the install was not done by a licensed installer.
A proper install includes vacuum testing the lines before charging, secure brackets rated for the outdoor unit, correct fall on the condensate drain, and sealed wall penetrations so you are not letting weather or vermin in.
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