P: Most Western Australian businesses don’t replace an ageing commercial air conditioning system until it fails – usually in the middle of summer or during the hottest week of the year. By then, you’re not planning a replacement, you’re scrambling for one, competing for labour and parts during peak season while staff, customers or stock sit in a building with no working climate control.
A commercial air conditioning system typically lasts 10 to 15 years, sometimes less here in Perth, where long summers put systems through heavier duty cycles than most manufacturers design their systems for. That being said, air conditioning units rarely fail without warning. There are some telltale signs, including rising bills, more frequent callouts, uneven temperatures or noises that weren’t there a year ago.
This guide walks through the warning signs worth acting on, how to weigh up a repair against a full system replacement when the signs expose themselves and what a properly planned upgrade actually looks like.
Warning Signs Your System Is Nearing End of Life
Age is a great place to start. If your system is up past the 10 to 15 year mark, it’s worth having it assessed even if it seems to be coping well enough. From there, a handful of operational signs will indicate more than system age can.
Rising energy bills without any change in how the building is used usually means the system is working at a greater capacity to deliver the same result. This is a relatively straightforward efficiency problem, and it doesn’t fix itself.
Frequent repairs are another clear signal that your system is on the way out. A single callout isn’t cause for concern, but several in a year, especially for different faults, means components are wearing out across the system. Isolated issues are more manageable but continual and diverse hiccups set up a repair-versus-replace conversation.
Inconsistent temperatures across your commercial space – hot spots in one area, cold spots in another – point to failing components, ductwork issues or a system that was undersized or mismatched for the building in the first place.
Unusual noises are worth investigating immediately. Grinding, hissing or rattling usually mean a mechanical part such as a bearing, belt or fan is failing. Ignoring these noises tends to turn a contained issue into a bigger one.
There’s also a compliance angle most guides skip: if your system is still running a phased-out refrigerant like R22, replacement parts and refrigerant gas are getting harder and more expensive to source. In regard to R22 specifically, by 2030 all imports of the refrigerant will be banned, so it’s wise to start planning for the future.
None of this means age alone is the deciding factor. A well-maintained 12-year-old system can outlast a neglected 8-year-old one. The signs above matter more than the number on the install date, which is exactly why they’re worth checking rather than guessing.
Repair vs Replacement: Making The Right Call
Here’s the rule of thumb: if a repair is going to cost more than roughly half of what a replacement would, or the system is already past two-thirds of its expected lifespan, replacement is usually the better spend. Repairing past that point tends to mean you’re forking out twice – once for the repair and again for the replacement not long after.
The cost comparison isn’t just the repair invoice. It’s the cumulative spend. Three or four callouts a year adds up fast and it’s worth tracking that total against a replacement quote rather than judging each repair in isolation.
Downtime costs matter just as much. A commercial AC failure means uncomfortable staff and customers, lost trade and for refrigeration-dependant businesses, risks to stock. A planned replacement avoids all of that, but an emergency one leaves you exposed.
Efficiency is the other side of the ledger. Newer systems draw less power for the same output, so part of the replacement cost is offset by lower running costs from the outset.
Before deciding, it’s worth weighing up how old the system is, how often it has needed servicing and maintenance, what refrigerant it runs on, whether the energy bill has been climbing and how much does the business depend on consistent climate control. Answer those honestly and the right call is usually clear.
Planning A Commercial HVAC Upgrade
A replacement done properly is a planned project, not a reaction to a breakdown. This starts with a proper site assessment and load calculation – sizing the new system to the building as it is now, not simply swapping in a like-for-like unit that may have been undersized or oversized to begin with.
Timing is also important. Scheduling the upgrade before peak season avoids the stress and potentially higher costs of urgent replacement and equipment availability under pressure. It also means your system will be running smoothly by the time you need it most.
At Complete Refrigeration & Air, we install and service a range of reputable brands including Mitsubishi Electric, Fujitsu, Actron Air systems and more. We match your system to the layout, size and usage of your building, rather than providing a “one-size-fits-all” recommendation. For larger commercial sites, budgeting and staging the work across zones or floors can spread the cost without leaving parts of the building without climate control.
It’s also critical that your system is installed by a licensed, ARC-tick certified contractor as commercial refrigerant handling is highly regulated. This ensures your air conditioning installation is compliant from day one.
Conclusion
Age, repair frequency and rising energy bills are the three things worth watching. Together, they tell you far more than any single sign in isolation. None of them mean immediate failure is guaranteed, but each one is a reason to have the system assessed by an experienced professional, rather than waiting blindly.
The businesses that handle this well are the ones that treat system replacement as a planned project, opposed to an emergency response. They get ahead of the assessment, budget for the upgrade accordingly and never end up explaining to staff or customers why the building has no climate control in the middle of summer.
If your commercial AC is showing any of the signs explored above, it’s worth having it assessed now, while there’s still time to plan properly rather than react. To book an inspection or discuss your building’s climate control requirements, get in touch with the specialist team at Complete Refrigeration & Air.
Frequently Asked Questions
How Long Should A Commercial Air Conditioning System Last?
Most commercial systems last between 10 and 15 years, though that range depends heavily on a range of factors including maintenance, usage and installation quality.
Is It Cheaper To Repair Or Replace A Commercial AC Unit?
It depends on the repair cost relative to a full replacement. As a rule of thumb, if a repair costs more than around half of what the replacement would, or the system is past two-thirds of its expected lifespan, replacement is usually the more cost-effective option long term.
What Are The Signs My Commercial AC Is About To Fail Completely?
A burning smell, a sudden total loss of cooling or visible refrigerant leaks are urgent signs the system could fail completely at any time. Any of these warrant an immediate call to a technician, opposed to waiting for a scheduled service.
How Much Does Commercial Air Conditioning Replacement Cost In Perth?
Cost varies significantly depending on the size of the system, the type of unit required and the complexity of the site – including ductwork, access and any electrical upgrades required. Due to that range, the most accurate figure comes from an on-site assessment rather than a general estimate.
