When to repair your aircon and when to replace it

Residential aircons have a typical lifespan. When a unit is relatively new, repair almost always makes sense — most of its useful life is still ahead.

Older units change the calculation in three ways. Parts are harder to source because brand support thins out for discontinued models. Efficiency drops as compressor wear increases. And one fault on an aging unit often indicates that other components are approaching the same point at the same time.

Age alone does not decide it — a well-maintained older unit with no history of repeated faults can still be worth repairing even in its later years. A younger unit that has been neglected and has shown repeated problems is a different picture. Age sets the context, but the fault type and what the repair would cost are what close the decision.

Some faults are isolated — a capacitor, a PCB, a fan motor. These parts fail on their own and the rest of the unit can still have plenty of life. Repairing an isolated fault on a unit with a good service history is often the right call.

Other faults indicate systemic decline. A compressor that fails on an old unit is expensive to replace and may signal the system is at the end of its useful life. Refrigerant leaks on old units often recur because the pipework is worn.

The right question to ask before approving any repair is whether this fault is isolated or whether it indicates the whole system is degrading. An isolated fault on a well-maintained unit with a clean service record is very different from the same fault on a unit that has had several problems in a brief period. A technician who inspects the system properly should be able to tell you which picture you are looking at and give you a clear reason for their view.

If the repair cost is more than half the cost of a replacement unit, replacement is usually the better decision.

Get a replacement quote alongside the repair quote. When the repair price closes in on the replacement price, the case for repair weakens — especially on an older unit.

This is a guide, not a fixed rule. A significant repair on a young, otherwise healthy unit with a clean service history is still a good decision — the unit has most of its useful life ahead of it. The same repair cost on a unit that is old, has had multiple prior faults, and is showing wear in several areas tells a different story. Age, service history, and fault pattern all shape whether the repair is worth it.

A repair addresses the fault in front of you. It does not reset the unit's age or condition. If the unit is old and poorly maintained, a repair extends the life by a brief period — not a long one.

If the unit is young and well-maintained, a repair recovers most of the remaining lifespan. That is a reasonable trade.

Ask the technician: if we fix this, what is the realistic lifespan of the unit? If the answer is uncertain or short, replacement deserves more weight.

Replace when the compressor fails on an old unit. Compressor cost plus installation often approaches or exceeds the cost of a new unit — and the rest of the system is equally aged.

Replace when you have repaired the same fault more than once in a brief period. A recurring fault means the underlying cause has not been resolved.

Replace when energy bills have risen noticeably without a change in usage. Old refrigerant systems lose efficiency over time. A new inverter unit operates meaningfully cheaper than an old non-inverter model.