Repairing an air conditioner is almost always cheaper upfront than replacing it. A repair call usually runs a few hundred dollars, while a new system costs several thousand. So the honest rule of thumb is this: if your unit is under about 10 years old and the fault is minor, repair it. If it is 10 to 15 years or older, has failed a major component, or the repair quote is getting close to half the price of a new system, replacement is usually the smarter money. At QuickAir, we have completed more than 20,000 services across Australia, and our technicians make this same call on-site every day. If a fix is worthwhile, we do it. If it is not, we will tell you.
The decision really comes down to three things: the age of your unit, how serious the fault is, and how the repair cost compares to the price of a new system. This guide walks through each one so you can make the call with confidence, whether or not you ever pick up the phone to us.
Should you repair or replace your air conditioner?
Repair your air conditioner when it is under roughly 10 years old, the fault is minor, and the unit has been reliable until now. Replace it when it is 10 to 15 years or older, the failure involves a major part like the compressor, or the repair bill approaches half the cost of a comparable new system.
Here is the short version:
- Repair when: the unit is under about 10 years old, the fault is small (a capacitor, a sensor, a fan motor, a thermostat, a blocked drain), and it has not needed repeated call-outs.
- Replace when: the unit is 10 to 15 years or older, a major component has failed, breakdowns are happening every season, or the repair estimate is more than 30 to 50 percent of a new system.
Most decisions are not close. A young unit with a bad capacitor is an easy fix. A 14-year-old system with a seized compressor is an easy replacement. The cases in the middle are where the numbers below matter most.
Repair vs replace at a glance
The table below sums up how the two options compare for a typical Australian home.
| Factor | Repair (keep existing unit) | Replace (new system) |
| Upfront cost | Low. Often a diagnostic fee and parts, a few hundred dollars. Major repairs can reach $400 to $1,000 or more. | High. A new split-system unit runs $600 to $5,500 plus installation. Ducted systems typically start around $10,000 and can be $15,000 or more. |
| Energy efficiency | Stays at the old unit’s level, so running costs remain high on an ageing system. | Modern inverter models use far less power, around 30 percent less than an old fixed-speed unit. |
| Lifespan added | A few more years on an already-aged unit. | Resets the clock, adding around 10 to 15 years of dependable service. |
| Reliability and warranty | Older units are prone to further breakdowns. The original warranty has likely expired. | Comes with a fresh manufacturer warranty, usually five years or more, and a lower risk of early failure. |
| Best when | The unit is under about 10 years old, the fault is minor, and it is otherwise reliable. | The unit is 10 to 15 years or older, failures are frequent or major, or the repair bill nears half the price of a new system. |
How old is your air conditioner?
Age is the first thing to check, because it shapes everything else. Most split system air conditioners in Australia last around 10 to 15 years, and a well-maintained unit sits at the top of that range.
If your air conditioner is under about 10 years old, a one-off repair is usually the most economical choice. Parts are still available, the unit has years of service left, and you are not throwing money at something on its way out. Once a unit passes the 10 to 15 year mark, efficiency has usually dropped and parts become harder to source, so replacement starts to win out. Regular servicing extends that lifespan, and a unit that has had an annual professional tune-up will often outlast one that has been left alone.
How serious is the fault?
The second factor is what has actually gone wrong. Not all faults are equal, and the cost gap between a minor and a major repair is large.
Simple repairs generally cost only a few hundred dollars, including parts. These “minor fixes” buy back several years of service at low cost, and on a reasonably young unit they are almost always worth doing. They include:
- Cleaning coils or clearing a blocked condensation drain
- Topping up or regassing refrigerant
- Replacing a fan motor, a capacitor or a faulty sensor
- Swapping out a failed thermostat or controller
Major failures are a different conversation. A compressor burnout, a leaking evaporator coil or a faulty control board can each cost $1,000 or more to put right. On an older unit, spending that kind of money to extend the life of a system that is already near the end rarely makes sense. Before you assume the worst, it is worth running through a few simple checks yourself, because a unit that is “not cooling” is sometimes just a clogged filter or a tripped switch rather than a failed part.
The 50% rule: comparing repair cost to a new system
A common rule of thumb in the trade is the “50% rule.” If the repair estimate is more than about half the cost of a comparable new system, replacing is usually the wiser financial move. Many technicians apply an even stricter guideline for old units, replacing once a repair exceeds roughly 30 percent of a new unit’s price.
A worked example makes it clear. Say your air conditioner is 14 years old and the repair quote comes in at $1,800, while a new replacement would be around $3,500. That repair is more than half the price of a new system, on a unit already past its expected life. In that situation the numbers point to buying new, and most people are better off putting the $1,800 toward a system that comes with a fresh warranty and lower running costs.
The same maths flips the other way on a younger unit. A $400 repair on a six-year-old system that is otherwise running well is money well spent, even though a new unit would technically last longer.
What a new air conditioner actually costs in Australia
Knowing real replacement costs is what makes the 50% rule useful, because “half the cost of a new system” only means something once you know that number. The figures below are typical Australian ranges.
| System type | Typical cost |
| Wall-mounted split system (one room) | Unit $600 to $5,500, plus installation from around $600 |
| Multi-split system (several rooms) | Higher, scaling with the number of indoor units |
| Ducted reverse cycle (whole home) | From around $5,000 for a small space, $10,000 or more for a typical house, $15,000 or more for large homes |
The unit itself is often only part of the bill. A split-system unit runs $600 to $5,500 before installation, and installation labour typically adds from around $600. A whole-home ducted system is a bigger step up again, often $10,000 or more for a typical house. By contrast, a common repair usually costs a few hundred dollars, which is exactly why repair almost always wins on upfront cost alone. The point of comparing the two is to look past that first number to the years of service and running costs behind it.
Energy efficiency and running costs
Efficiency is the factor most people forget, and on an ageing system it quietly adds up. Newer inverter-driven air conditioners use far less electricity than old fixed-speed models. According to energy.gov.au, an inverter system can be around 30 percent more efficient than a conventional fixed-speed unit, and reverse-cycle cooling and heating is one of the most efficient systems you can run. On an older, less efficient unit, that gap can add hundreds of dollars a year to your power bills in a climate where the system works hard.
Those running costs belong in your repair-or-replace maths, not just the repair quote. How much you save by upgrading depends on your system, your climate and your electricity price. Sustainability Victoria’s running-cost tables let you compare the annual cost of different cooling systems side by side, so you can see the gap between an old, inefficient unit and a newer high-efficiency one. If your current system still runs smoothly and your bills have not crept up, a repair may make sense. If you have noticed rising energy costs or weaker cooling despite normal use, those higher running costs should count against keeping the old unit.
Does your air conditioner use R-22 refrigerant?
Refrigerant availability is a factor that catches a lot of homeowners out. Many older air conditioners run on R-22, a refrigerant that is being phased out in Australia, with imports winding down to zero by 2030. As supplies dwindle, R-22 systems cost more to recharge, and that cost only climbs from here.
Parts are the other half of the problem. If your model is old or discontinued, components like compressors, circuit boards and fan motors can be hard to find or expensive when they are. When required parts are scarce or carry long lead times, that alone can tip a borderline decision toward a new system, because a system you cannot get parts for is a system you cannot rely on.
What about the warranty?
If your air conditioner is beyond its warranty, usually 5 to 10 years, every repair is out of your own pocket. Replacing the unit gives you a new manufacturer warranty, often five or more years on key components, and the confidence of a reliable fresh system. For a unit already past its warranty and its expected lifespan, that shift in risk is worth weighing alongside the repair quote.
Frequently asked questions
Is it worth repairing a 10-year-old air conditioner?
It depends on the fault. A minor repair on a 10-year-old unit that has been reliable is usually worth doing, especially if it has been serviced regularly. But if the fault is a major component like the compressor, or the repair quote approaches half the cost of a new system, replacement is generally the better value at that age.
How much does it cost to replace an air conditioner in Australia?
A wall-mounted split system unit typically costs $600 to $5,500, plus installation from around $600. A whole-home ducted reverse cycle system usually starts around $10,000 for a typical house and can be $15,000 or more for larger homes. A repair, by comparison, usually costs a few hundred dollars.
How long do split system air conditioners last?
Most split systems last around 10 to 15 years. Annual servicing helps them reach the top of that range, while a unit that is never serviced tends to fail earlier and run less efficiently along the way.
Should I replace my air conditioner if it uses R-22 gas?
Not automatically, but it is a strong signal. R-22 is being phased out in Australia, with imports winding down to zero by 2030, so recharging an R-22 system will keep getting more expensive. If an R-22 unit also needs a major repair or is over 10 years old, replacement is usually the more sensible long-term choice.
Can I get an honest opinion before deciding?
Yes. A qualified technician can quote the repair on-site and compare it directly to replacement, which is the only way to apply the 50% rule to your actual unit. Our policy is to give that assessment honestly, and if replacement is the smarter option, we credit the assessment fee toward a new install.
Get an honest repair-or-replace assessment
The surest way to decide is a proper on-site diagnosis. A qualified technician can quote the repair, compare it to the cost of a new system, and make the age and efficiency factors clear for your specific unit. Small repairs on a young, well-maintained air conditioner usually make economic sense. A costly fix on an old or inefficient unit can be a false economy, and the point of a good assessment is to tell the two apart.
That is exactly what we do. If your air conditioner has stopped performing, book a same-day repair and replacement assessment with QuickAir, or call us on 1300 730 896. Our technician will diagnose the fault, give you a fixed price before any work starts, and tell you honestly whether a repair is worth it or your money is better spent on a new system. No pressure either way, and if a replacement is the smarter call, the booking fee is credited toward your new install.
