April 21, 2026 · Cairns Aircon Installers
9 red flags your AC unit is outdated. The summer heat is relentless in Cairns, and our trusty air conditioners work tirelessly, and here, nearly year-round, to keep our homes cool and comfortable. But AC units have a finite lifespan, and in the tropics, salt air and humidity shorten it further. An outdated unit doesn’t just cool poorly: it quietly costs you more every quarter.
Here are the nine signs we look for when a customer asks us “repair or replace?”
The 9 Red Flags
- It’s more than 10–12 years old. Coastal FNQ units age faster than the southern average. Past a decade, major component failure is a matter of when, not if.
- It uses R22 refrigerant. R22 is phased out in Australia, it can no longer be imported, making any refrigerant repair extremely expensive, if it’s possible at all.
- Repairs are getting closer together. One repair is a repair; a repair every season is a subscription. Once a repair quote passes about a third of a new installed system, replacement wins.
- Power bills keep creeping up. A tired compressor and dirty, corroded coils can double the energy an old unit needs to do the same job a new inverter unit does easily.
- It can’t hold temperature any more. Running flat out all afternoon and the room still isn’t cool? Lost capacity rarely comes back.
- It struggles with the humidity. If the house feels cold and clammy at once, the system is no longer dehumidifying correctly, the exact job aircon does for us in Cairns.
- Rust and corrosion on the outdoor unit. Cabinet rust is cosmetic; corroded coil fins and refrigerant lines are terminal, and common near the beaches.
- It’s loud. Grinding, rattling or a compressor you can hear from inside means bearings and mounts are on the way out.
- Musty smells that return straight after cleaning. When mould recolonises a coil within weeks of a professional clean, the coil surface itself is breaking down.
The Repair Or Replace Maths
When we get asked this on site, we work through three questions in order.
- How old is it? Under seven years and in good condition, repair is almost always right. Past twelve, you are spending money on a system that owes you nothing.
- What does the repair cost against a new installed system? Our rule of thumb: once a single repair passes about a third of the cost of replacing the system, replacement is usually the better call. You are not just buying the fix, you are buying the next five years without one.
- Is this the first repair or the third? One failed capacitor on an eight-year-old unit is bad luck. Three call-outs in two summers is a system telling you something.
What we will not do is quote you a new system when a minor repair will genuinely see you through. Some of our best customers came from us doing the opposite of the expensive thing.
Why R22 Changes The Answer
If your system was installed before roughly 2010, there is a good chance it runs on R22 refrigerant. R22 has been progressively phased out in Australia and new supply is heavily restricted, which means the gas itself is scarce and expensive where it is available at all.
The practical effect: on an R22 system, any fault involving refrigerant turns a routine repair into a very expensive one, and sometimes into an impossible one. It also means a slow leak cannot simply be topped up year after year. If a technician tells you your system is R22 and it has a leak, replacement is almost certainly the sensible answer.
What A New System Actually Buys You
People focus on the cooling, but the gains that matter most in Cairns are the other ones:
- Dehumidification. Modern inverter systems pull moisture out of the air far better than the fixed-speed units they replaced. In our climate, that is often the difference people actually feel.
- Running cost. An inverter ramps up and down instead of slamming on and off, so it holds temperature using a fraction of the power once the room is down.
- Noise. Current models run considerably quieter, which matters when the bedroom unit runs every night for seven months.
- Corrosion protection. Coastal-rated coil coatings are standard on the units we specify near the beaches, and they are the reason a new system lasts up here.
- Warranty. A new install resets the clock: five years from the manufacturer, plus our five-year workmanship warranty on the installation itself.
Time It Before It Fails
Almost nobody plans an aircon replacement. They call us in the last week of January with a dead system, a full house and no patience, and take whatever can be installed fastest.
If your system is showing two or three of the red flags above, get it assessed in the dry rather than waiting. You get to compare brands properly, you get a booking date that suits you, and you are not making a fifteen-year decision in a bad week.
What Happens To The Old Unit
We remove it and dispose of it responsibly as part of the job. Refrigerant has to be recovered by a licensed technician rather than vented, which is both a legal requirement and the reason it should never be a DIY removal. Where the existing pipework, brackets and wall penetrations are sound, we reuse them, which keeps the install tidier and the cost down.
The Upside Of Replacing
Modern inverter systems are dramatically more efficient than units from even ten years ago, are far better at dehumidifying, and come with tropics-ready anti-corrosion coatings. With a combined 5-year warranty on a new system and the efficiency gain over a decade-old unit, replacement often pays for part of itself on the power bill alone. See our current specials.
Not sure which side of the line your unit is on? Book a free assessment. We’ll give you a straight answer.