As the temperatures start to drop across Australia, many households turn to their split system air conditioners for warmth and comfort. While these systems are designed to handle both cooling and heating, they often spend months sitting idle before winter arrives. If your unit hasn't been checked in a while, you could be in for higher power bills, poor performance, or an unpleasant surprise on the first cold morning.
The good news? A few simple checks can help ensure your split system is ready to keep your home warm all winter long.
Here are the key things every homeowner should look at before switching their system into heating mode.
One of the most common reasons split systems struggle during winter is dirty air filters.
Over time, filters collect dust, pet hair, pollen, and other airborne particles. When they become clogged, airflow is restricted, forcing the system to work harder to heat your home.
Signs your filters need attention include:
Most split systems have washable filters that can be cleaned with warm water and allowed to dry completely before reinstalling. Check your manufacturer's instructions for specific guidance.
A clean filter helps your unit run more efficiently and improves indoor air quality at the same time.
Many Australians don't use the heating mode for months at a time.
That's why it's a good idea to test your split system before winter properly arrives. Turn the unit on and set it to heating mode for at least 15 to 20 minutes.
Pay attention to:
If something doesn't seem right, arranging a professional inspection early can help you avoid being left without heating during a cold snap.
A slight dusty smell when first switching to heating mode is usually normal, especially if the system hasn't been used for a while.
However, persistent odours may indicate a bigger problem.
Watch out for:
Ignoring these warning signs can affect both system performance and indoor air quality.
A qualified air conditioning technician can identify the source and safely resolve the issue before it becomes more serious.
The outdoor condenser unit plays a critical role in the heating process.
Throughout autumn, leaves, dirt, grass clippings, and debris can accumulate around the unit. These obstructions reduce airflow and can affect efficiency.
Take a few minutes to:
It's also worth looking for signs of rust, corrosion, or loose components.
While basic cleaning is fine for homeowners, any repairs or internal inspections should be left to licensed professionals.
Sometimes heating problems aren't caused by the system itself.
Incorrect thermostat settings can make it seem like your split system isn't working properly.
Before assuming there's a fault:
For most households, a setting between 18°C and 22°C provides a comfortable balance between warmth and energy efficiency.
Even a small adjustment can have a noticeable impact on running costs throughout winter.
Every split system makes some operational sounds, but unusual noises can signal developing issues.
Common warning signs include:
These sounds may indicate loose parts, fan issues, electrical faults, or worn components.
Addressing problems early often prevents more expensive repairs later on.
If the noise persists after cleaning the filters and checking for obvious obstructions, it's time to call a professional.
Have you noticed your system taking longer to warm rooms than it used to?
Reduced efficiency is often one of the first indicators that maintenance is required.
Possible causes include:
An inefficient system consumes more electricity while delivering less comfort.
Given Australia's rising energy costs, even minor efficiency improvements can make a meaningful difference to your winter power bills.
Water pooling around an indoor unit should never be ignored.
Leaks can result from:
Left untreated, moisture can cause mould growth, wall damage, and costly repairs.
If you spot any signs of leaking, switch off the system and arrange an inspection as soon as possible.
While homeowners can perform basic checks, a professional service provides a much more thorough assessment.
An experienced technician can:
Think of it like servicing your car before a long road trip. A small investment in preventative maintenance can help avoid larger repair bills down the track.
Many manufacturers also recommend regular servicing to maintain warranty requirements and maximise system lifespan.
One of the biggest mistakes homeowners make is waiting until they actually need heating before checking their split system.
Unfortunately, that's also when HVAC technicians become busiest.
By arranging maintenance before winter fully arrives, you'll often have:
A little preparation now can save a lot of stress later.
Your split system is one of the hardest-working appliances in your home during winter. Giving it a quick health check before the cold weather sets in can improve efficiency, lower running costs, and help prevent unexpected breakdowns.
While some maintenance tasks are simple enough for homeowners, more technical inspections are best handled by qualified professionals. If your unit isn't performing as it should, or you'd simply like the reassurance of a professional service, it's worth getting expert help before winter reaches its peak.
Through ServiceSeeking.com.au, homeowners can easily connect with trusted local air conditioning technicians who can inspect, service, and repair split systems across Australia. Comparing quotes and finding experienced professionals has never been easier—helping you stay warm, comfortable, and worry-free all winter long.