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Should You Repair or Replace Your Aircon?

The repair-or-replace call should come from the unit's condition, not the first quote you receive. This tool weighs unit age, refrigerant type, what failed, and the quote against replacement, then shows the reasoning so you can sanity-check the next step.

Run the diagnostic

Answer one question at a time. The form skips ahead when an answer is decisive on its own. Most cases land on a verdict in two or three steps.

Step 1

How we think about it

Repair-or-replace advice shifts depending on whether the visit is framed as repair, installation, or diagnosis. A flat 50% rule also misses refrigerant type, climate, usage, and installation condition.

The decision depends on unit age, the failed component, refrigerant, repair cost versus replacement, and whether the fault is repeating.

Signals to weigh

Most real cases mix repair and replacement indicators. The calculator weighs them together; these lists show the individual signals.

Lean toward repair when

  • Unit is under 5 years old
  • Failed part is a capacitor, sensor, fan motor, or drain
  • Repair quote is well under half of replacement cost
  • Refrigerant is R32 or R410A
  • First major issue in the last 24 months
  • Unit is still under manufacturer warranty

Lean toward replacement when

  • Unit is 13+ years old
  • Compressor or coil leak on a 10+ year unit
  • Refrigerant is R22 with a major component fault
  • 3 or more major repairs in the last 24 months
  • Repair quote is more than half of a brand-new unit
  • Unit needed a refrigerant top-up more than once in 12 months

Common mistakes when deciding

Four patterns we see repeatedly when people make this call without a framework.

  • Replacing too early for a small fault.

    A capacitor failure on an 8-year-old unit is usually a modest repair, not an automatic replacement case. Check the failed part and repair cost before replacing the whole unit.

  • Repairing too long on a declining unit.

    Several major repairs in a short period make replacement more sensible than another isolated fix. Compare the total recent spend against a like-for-like replacement.

  • Trusting one recommendation without the diagnostic context.

    A quote is easier to judge when it spells out the failed part, unit age, refrigerant type, repair history, and replacement comparison. Those inputs matter more than the label “repair” or “replace.”

  • Ignoring refrigerant type.

    R22 is being phased out in Singapore. Top-ups keep getting more expensive, and a major repair on an R22 unit rarely pays back even when today’s price looks reasonable.

Common questions

What is the 50% rule for repair vs replace?
A common HVAC heuristic: if the repair cost exceeds 50% of replacement cost, replace. It's a useful starting point, but it ignores age and component severity, which usually matter more in practice. A S$400 repair on a 3-year-old unit is repair territory. The same quote on a 12-year-old unit usually isn't.
How long does a typical aircon last in Singapore?
7 to 10 years for an averagely-maintained split unit, 12 to 15 with consistent servicing. Coastal exposure, heavy daily runtime, and skipped maintenance all compress lifespan. Past 13 years, even a cheap repair rarely pays back. Parts get harder to source and efficiency falls well below current models.
Should I top up R22 refrigerant or replace the unit?
It depends on the pattern. A one-off top-up on an R22 unit that's been running cleanly for years can be reasonable. Recurring top-ups are a different story. The leak itself is the real problem, and fixing leaks on R22 systems is increasingly uneconomical because R22 supply is being phased out. Two top-ups inside 12 months is a strong signal to plan replacement.
What counts as a major repair?
Compressor failure, refrigerant leaks (especially at coils), and PCB or control board failures. These either cost a lot, signal systemic decline, or both. Capacitors, sensors, fan motors, and drain issues are minor: quick fixes that don't bear on the replace decision on their own.
Is chemical overhaul worth it on an old unit instead of replacing?
It can be, but only when the unit is still mechanically sound and the buildup is what's hurting performance. If the airflow is weak from coil fouling on a 10-year-old unit, an overhaul usually brings it back. If cooling is declining AND there's a refrigerant leak, an overhaul won't save it. Diagnose before deciding.
How do I tell what refrigerant my unit uses without calling someone?
Check the silver label on the outdoor unit. Refrigerant type is printed alongside the model number and capacity. Pre-2010 installs are most likely R22, 2010 to 2018 are usually R410A, and 2018 onward is typically R32. If the label is gone, the install year is the next-best signal.

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Tell us what’s going on. Symptoms, setup, photos, anything we should know. We’ll assess and come back with the right next step.

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