6 Common Signs Your Air Conditioner Needs Repair

In these last remaining days of winter for 2025, you might be starting to think about your ducted or split system air conditioner and taking the necessary steps to get it summer ready.

If you’ve not used your AC in a while, spotting the early signs your air conditioner needs repair now may save you a heap of trouble later. It can help you avoid the discomfort of a broken unit right when you need it most. And it just might help you avoid the need for premature air conditioner replacement.

From weak airflow to unusual smells, here are six all-too-common signs that your aircon needs repairs before summer hits. Getting on top of these problems now can save you from high electricity bills, poor air quality, and costly breakdowns.

1. Weak Airflow or Warm Air

One of the most obvious signs your air conditioner needs repair is when the air coming from your vents isn’t cool enough to cool your home.

When your air conditioning unit seems only to send out warm air throughout the house, or its airflow feels noticeably weaker than it should, there’s almost certainly a problem that needs attention.

There are several possible reasons why a cooling system might struggle to keep a consistent air temperature as the weather heats up. Those reasons include:

• A clogged filter
• A blockage in the ductwork
• Low refrigerant levels or
• A failing compressor

Faults like these impact more than just your general comfort. Chances are you’ll also see your electricity bills skyrocket and the lifespan of your aircon diminish.

Don’t wait for your air conditioner to give up on you in the middle of a stifling heatwave. Get your AC unit repaired now, long before summer kicks in.

2. Unusual Noises Coming from Your Unit

The standard air conditioner doesn’t typically run in complete silence, but it shouldn’t sound like a bad garage band detuning its instruments while simultaneously operating jackhammers either.

Consider your air conditioner making banging, buzzing, rattling or screeching noises as a major cry for help. These typically indicate that there may be loose fan blades, damaged electrical parts, or a failing compressor. Do nothing about these faults, and you can expect major repair costs in your future.

Strange noises coming from your existing unit don’t just get in the way of your peace and quiet. They’re one of the biggest tell-tale signs your air conditioner needs repair. Getting on top of it early is the best way to protect your system, maintain a consistent temperature, and avoid an expensive breakdown as the weather slowly warms up.

3. Spikes in Electricity Bills

Suddenly finding your power bills rising without any correlating increase in usage can happen when your air conditioner breaks down.

When your AC unit isn’t working efficiently, it uses more energy to deliver less comfort. This is not only frustrating but costly. Watch for these red flags:

• Your air conditioner system struggles to reach your desired temperature.
• The system turns on and off more frequently (short cycling).
• Airflow feels weak or uneven in different rooms.
• The outdoor unit operates constantly, even during cooler times.
• You notice less cool air but higher energy costs.

Whether you have a split or ducted system, these are signs your air conditioner needs repair before summer really kicks in.

4. Excess Moisture or Leaks Around the Unit

If you discover water pooling around your indoor or outdoor unit, this indicates a possible blocked drain pipe or refrigerant leak.

Now, you might consider excess moisture to be a relatively minor issue. But it’s important to understand that it’s a problem that can lead to mould growth, poor indoor air quality, and damage to nearby walls or flooring. Refrigerant leaks pose an even bigger risk, impacting your cooling system’s efficiency and safety.

Don’t ignore your air conditioner if you find it dripping, leaking, or even sweating more than usual. These are common signs your air conditioner needs repair and should be addressed by a licensed air conditioning technician as soon as possible.

5. Strange or Unpleasant Smells

We’ve already discussed the strange noises that an air conditioner can make. Also worth keeping your senses primed for are the unpleasant odours that an AC unit that hasn’t been maintained properly can also produce.

If your air conditioner gives off a strange or unpleasant smell when it runs, don’t just spray some air freshener and hope for the best. A musty odour might mean mould growth inside your air conditioning unit or clogged air filters, while a burning smell could signal damaged electrical components. Both affect your air quality and could pose a health or fire risk.

A properly maintained system should never smell foul or concerning. If your AC system produces odd or persistent odours, it’s one of the clearest signs your air conditioner needs repair ASAP.

6. Frequent Repairs or Old Age

If your air conditioning system seems to break down every few months, or it’s been patched up more times than you can count, it may be nearing the end of its life. Frequent repairs, rising energy bills and reduced performance are all signs your air conditioner needs repair. But it may even spark the question of whether to repair or replace your air conditioner.

An old air conditioning unit, especially one over 10-15 years old, will naturally lose efficiency and may no longer meet your cooling needs. Upgrading to a new unit or a model with increased energy efficiency can deliver better comfort, lower repair costs and long-term savings on electricity bills.

Sometimes, the time simply comes to say goodbye to the old unit and hello to a new world of comfort with a truly energy-efficient model.

When to Call a Licensed Air Conditioning Technician

When your air conditioning system starts acting up, it’s tempting to poke around and try fixing it yourself. That can do more harm than good, though, and you might find yourself needing to replace your air conditioner sooner than you’d like.

Australian regulations require a licensed air conditioning technician for any work involving electrical components or major repairs, and an ARCTICK-licensed technician for refrigerant gas-related work.

They can diagnose the issue, assess whether you need a repair or replacement, and ensure everything’s up to code. If you’ve spotted any signs your air conditioner needs repair, book a licensed expert to handle it properly.

Don’t Sweat It – Act Early and Stay Cool

Catching the early signs your air conditioner needs repair can save you from a sticky situation when the summer heat kicks in.

From unexpected electricity bill increases to strange smells or a unit that seems to only blow hot air, ignoring these warnings can lead to expensive repairs. It may even result in the premature need to replace your air conditioner.

Regular maintenance and prompt action help your system run efficiently, improve indoor air quality, and keep energy costs under control.

Don’t wait for your cooling system to completely break down. Get it sorted now and enjoy a stress-free summer with the fresh, cold air you want.

Please note: Thanks for reading our blog “6 Signs Your Air Conditioner Needs Repair”. This information is provided for advice purposes only. Regulations differ from state to state, so please consult your local authorities or an industry professional before proceeding with any work. See our Terms & Conditions here.