What size split-system air conditioner do I need in Adelaide?
Why square metres are not enough
Two rooms of the same size can have very different heat loads. A west-facing room with large unshaded glazing and poor ceiling insulation needs a different assessment from an internal, shaded room in a well-insulated home.
The cost of undersizing
An undersized unit may run continuously, struggle on extreme days and fail to deliver the comfort expected. It can also make online efficiency claims irrelevant because the unit is operating at its limit.
The cost of oversizing
Bigger is not automatically safer. An oversized system can cycle frequently, create uneven temperatures and control humidity less effectively. It may also cost more to purchase and require a larger electrical supply.
Information to prepare
Measure room dimensions and ceiling height. Note window sizes, orientation, shading, insulation, adjoining spaces and how the room is used. An installer should confirm placement, pipe route, drainage, outdoor access and electrical connection before finalising the quote.
What should you do next?
For a site-specific answer, describe the property, symptoms and timing. A licensed professional can then confirm what testing or inspection is required before quoting.
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Editorial note: This guide is general information for South Australian homeowners. It does not replace an inspection, electrical testing or advice from a licensed contractor. Requirements, incentives and prices can change.