Last Update: 12 September 2025
One of the most frequent questions we get asked is: "How do I know when my air conditioner needs servicing?"
While we always recommend regular scheduled maintenance to keep your unit running at peak performance, your AC system will often give you clear signs that it needs attention. Recognising these early can prevent a small issue from becoming a costly repair and ensure your home stays cool and comfortable.
This guide will walk you through the top clues that your air conditioner is in need of professional help, from strange noises and weak airflow to sudden spikes in your energy bill. Knowing these signs empowers you to address potential problems before they lead to a complete breakdown.
One of the questions we get most frequently asked is:
"How Do I Know When My Air Conditioner Needs Servicing?"
At Coastal Air, we obviously recommend regular scheduled servicing to keep your aircon unit running at its best, but sometimes your system will give you some very clear signs that something's not right.
Catching these signs early can save you from a small issue becoming a major repair bill and a sweltering summer day without AC! š„µ
Here are the top signs your air conditioning needs professional servicing:
š„µ It's Blowing Warm Air & Not Cooling Like It Used To
Is your air conditioner running but your home still feels warm? This is one of the most common signs of a problem. It could be a refrigerant leak, a dirty coil, or a faulty compressor.
š It’s Making Strange Noises
Are you hearing grinding, squealing, or clanking sounds from your unit? Don't ignore them! These sounds often indicate a mechanical issue, such as a worn out fan belt, a loose part, or a failing motor.
š¬ļø The Airflow is Weak
If the air coming from your vents is weak, it could be a sign of a clogged air filter, a blockage in your ductwork, or a problem with the fan. Weak airflow means your AC is working harder to cool your home, leading to higher energy bills.
š¤¢ It Has a Funky Smell
A musty, stale smell could mean you have mould or mildew in your air con unit or ductwork. A burning smell might indicate a serious electrical issue. These smells are not only unpleasant but can also be a health hazard ā ļø
š¦ Your AC Has Sprung a Leak
Puddles of water or a hissing sound around your indoor or outdoor unit are a big red flag. Water leaks can cause damage to your home, and a refrigerant leak is a serious problem that needs immediate attention from a professional.
š Your Energy Bills are Through the Roof
If you haven't changed your air conditioning usage but your power bill is suddenly much higher, your system is likely losing its efficiency. It's working harder to do its job, which means it’s using more energy. A professional service can restore its efficiency.
š The Bottom Line š
Ignoring these signs can lead to a complete system breakdown, a more expensive repair, and a very uncomfortable home! If your air conditioner is showing any of these symptoms, it's a good idea to call in the professionals.
Don't wait until your AC gives up on the hottest day of the year.
Contact Coastal Air Heating & Cooling on 1300 151 545 on complete our enquiry form today for a professional inspection and service!
Published by: Joshua Walker