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Repair or replace your AC? A plain way to decide before the summer

Most AC faults are worth fixing. A few are not, and the difference is usually the compressor, the unit's age and its running cost. How to think it through.

4 min read · Updated 19 August 2026

The short answer: repair when the fault is small and the unit is sound; replace when the compressor has failed on an old unit, when the coils are rotting, or when the unit has become a yearly expense in gas and visits. Everything else is detail, and the detail below will help you put a number on it.

Start with a diagnosis, not a guess. A diagnosis visit is ₹350 and you get a written quote before any work. Then ask the three questions.

Question one: what has actually failed?

Faults sort themselves into two piles.

Almost always worth fixing, whatever the age:

  • Capacitor, relay or contactor in the outdoor unit
  • Fan motor (indoor blower or outdoor fan)
  • Remote, sensor, thermistor
  • Blocked drain, dirty coils, worn insulation
  • A leak at a flare nut or a pipe joint, followed by a gas refill (₹700 on a split)
  • PCB, in many cases — the part is shown at MRP so you can judge it on the spot

These are parts, not the heart of the machine. Fixing them on a ten-year-old AC is sensible because the compressor, the thing that wears out, is still fine.

Worth a hard think:

  • A seized or burnt compressor
  • A coil that has corroded through, especially on the coastal side where salt air does this to outdoor units
  • A gas leak that has been "topped up" for three summers and has now damaged the compressor
  • Multiple faults on one visit — capacitor plus fan motor plus a leak on a unit that was already weak

Question two: how old is it, and what does it cost to run?

Age on its own is not the deciding factor, but it changes the odds. A compressor replaced at year four gives you years of life; the same job at year twelve leaves you with a new compressor inside an old coil, old fan motors and an old PCB, any of which can be next.

Running cost matters more than people think in Nellore, because the AC runs from March to October or longer. An older non-inverter unit, or an inverter unit that has lost efficiency to corroded coils, draws noticeably more than a current 5-star inverter model doing the same job. Look at your bill for a summer month. If the AC is the biggest item on it, the saving from a newer unit is part of the calculation, not a footnote.

A rough rule many technicians use: if the repair quote is more than about half the price of a comparable new unit and the unit is past eight years, replace. If the repair is a small part, repair.

Question three: is this the first big repair or the third?

One compressor-level repair in a decade is bad luck. Three visits in two summers is a pattern. If the unit has been topped up with gas more than once, the leak was never fixed and the compressor has been running on a low charge; it is likely to be the next thing to go. Put the history on the table when you get the quote.

A simple table

Situation Lean towards
Small part (capacitor, fan, sensor, drain), any age Repair
Leak at a joint, then refill Repair
Compressor failed, unit under about 7 years, warranty may apply Repair, after checking the warranty
Compressor failed, unit 8+ years, non-inverter Replace
Coil corroded through, unit 8+ years Replace
Second or third gas top-up, cooling still weak Replace, or fix the leak properly and stop topping up
Repair quote over half the price of a new unit Replace

Check the compressor warranty first

Many manufacturers cover the compressor for longer than the rest of the unit, often five to ten years. If the compressor has failed and the unit is inside that window, the part may be covered and only labour and gas are payable. Find the invoice or the serial number before you decide; it can flip the answer.

If you replace

An uninstallation with gas recovery is ₹499 and an installation of the new unit, bracket to trial run, is ₹899. Reuse the existing copper line set only if the technician confirms it is sound and the right size for the new gas; R-32 units are often installed on fresh pipe. Our guide on choosing and installing a new AC covers tonnage and placement for a Nellore home.

If you repair

Ask for the old part, ask what caused the failure, and ask what else on the unit is showing its age. A good technician will tell you honestly whether this is the last repair worth doing. That conversation, with the part in his hand and the quote in yours, is where the decision should be made, not over the phone in the morning.

Questions people ask

At what age should I stop repairing an AC?
There is no fixed age. A ten-year-old unit with a blown capacitor is worth fixing; a six-year-old unit with a seized compressor and corroded coils may not be. Think in terms of the fault, the repair quote as a share of a new unit's price, and how much more electricity the old unit burns compared with a modern one.
Is replacing a compressor worth it?
Sometimes. If the unit is under about seven years old, the rest of it is in good shape and the compressor is still under the manufacturer's warranty, yes. If the unit is older, the coils are corroded or it has needed gas repeatedly, the money is usually better spent on a new unit that also runs cheaper.
Does it make sense to keep an old non-inverter AC going?
For a room used a few hours a day, yes, as long as repairs are small. For a bedroom that runs eight hours a night for eight months, the extra power an old non-inverter unit uses adds up every month, and a failing compressor is the natural moment to switch rather than pour money into it.

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