Turn the capacity you need and the system type into an illustrative low and high installed price, plus fixed job costs.
Use this estimator to see whether a heating and cooling quote sits in a plausible range before you meet the installer. Pick a system type, enter the total rated capacity in kilowatts and any fixed costs that do not scale with size.
How it works. Low estimate = capacity × low rate + fixed costs. High estimate = capacity × high rate + fixed costs. Choosing an option fills in the rates, which you can overwrite.
Getting the capacity right. Use the rated cooling capacity on the product data (heating capacity is usually a little higher). For several split systems, add the capacities together. The sizing guide shows a rough method.
Worked example (illustrative). A 7.1 kW wall split installed back to back at $350–$600 per kW, plus $700 for a dedicated circuit and wall brackets: low = 7.1 × 350 + 700 = $3,185; high = 7.1 × 600 + 700 = $4,960.
Limits. The rates are illustrative ranges chosen for this site, not survey data or quotes, and include GST. Real prices depend on your city, brand, access, roof space, switchboard condition, pipe length, zoning and the installer's overheads. They exclude NSW Energy Savings Scheme or Victorian Energy Upgrades discounts, which some installers deduct on the quote. Always get at least three written quotes from licensed installers.
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