How much does air conditioning cost to install?

Air conditioning has a wide price spread, and the same home can be quoted thousands apart. That is rarely dishonesty. It is usually three installers pricing three different systems, with three different specs, and only one of them having actually measured the rooms.

Here is roughly where the numbers sit on the coast, supply and install, in 2026.

Indicative install ranges

• Cheap quote. oversized box, no load calc, standard coil $2,000 – $3,200
• Single split. sized, named, coastal coil, ~2.5–7kW $2,600 – $4,500
• Multi-head split. 2–5 heads on one outdoor unit $6,500 – $14,000
• Whole-home ducted. zoned, controller, roof install $11,000 – $26,000+
• Commercial refrigeration. coolroom / freezer / display, by spec from $9,000

These are indicative only, not a quote. The cheap-quote row is in red for a reason: a number that low usually means an oversized box chosen without a load calc, a standard coil fitted in a salt zone, and the electrical left for you to sort out. It is cheap because of what it leaves off.

What moves the number

• Capacity (the load calc). The biggest single lever. The kW comes from a room-by-room calc, not the floor area. Oversizing short-cycles and wastes power; undersizing never keeps up. We size it once, properly.
• System type. A single split, a multi-head, and a zoned ducted system are three different jobs. Ducted adds roof access, ductwork runs and a controller; multi-head adds heads and refrigerant line.
• Coastal coil spec. A blue-fin or treated condenser costs more than the standard coil and lasts years longer in the salt zone. On a beachside install it is the difference between a decade and three summers.
• Electrical + power. A dedicated circuit is standard. A ducted or large multi-head may need three-phase power or a switchboard upgrade, which we cost up front rather than as a surprise.
• Access + pipework. Line length between indoor and outdoor units, roof or wall-cavity runs, second-storey access and tricky outdoor placement all add labour and material.
• Refrigeration spec. For coolrooms and freezers: volume, the temperature band (chiller vs freezer), insulation, the condenser unit and whether it is a breakdown replacement or a new fit-out.

The honest comparison is not which quote is cheapest, but which quotes are pricing the same system, sized the same way, with the same coil spec. Line those up and the price gap usually explains itself.

Buy price versus running cost

The sticker price is only half the story. An oversized or poorly sized system costs more to run every month it operates, and a standard coil on the coast can need replacing years early. A right-sized inverter system with the correct coil costs a little more up front and noticeably less over its life. That is the comparison worth making.

How we quote at Saltline

Every Saltline quote arrives as seven lines with a figure beside each, and the equipment named in writing. You can lay it next to any other quote and see, line for line, exactly where the difference sits. That is the whole idea: a number you can actually compare.