Air Conditioner Not Keeping Up With Adelaide Heat? 7 Things to Check
Your air conditioner can be running all afternoon and still leave your home feeling uncomfortable when Adelaide experiences extreme summer heat.
You may notice that the system keeps running, but the temperature hardly changes. One bedroom may remain hot while the living area feels comfortable. Perhaps the air coming from the vents feels weaker than usual, or the system seems to work much harder than it did earlier in summer.
Before assuming that the air conditioner has completely failed, it is worth looking at why it is struggling.
Extreme outdoor temperatures can expose problems that are less noticeable on mild days. The cause could be the system's capacity, restricted airflow, heat entering through windows, poor insulation, the outdoor unit's location or even the way the system was originally installed.
Here are seven things worth checking when your air conditioner is not keeping up with Adelaide heat.
Why Does an Air Conditioner Struggle More on Extremely Hot Days?
An air conditioner is not cooling an empty box. It is constantly dealing with heat entering your home through windows, walls, ceilings, doors and other areas.
When the outdoor temperature rises significantly, the amount of heat your home needs to reject also increases.
This creates an important distinction:
An air conditioner that struggles only during extreme heat is not necessarily faulty.
However, if the same rooms remain hot every summer, the system runs continuously without achieving a comfortable temperature, or its performance has noticeably declined, there may be an underlying issue that needs attention.
The first step is to identify the pattern rather than immediately replacing the system.
7 Things to Check When Your Air Conditioner Isn't Keeping Up
1. The Air Conditioner May Not Be Large Enough for the Home
One possible reason is that the system does not have enough cooling capacity for the space it is expected to handle.
This is more complicated than simply comparing the size of the house with the size of the air conditioner.
A home's cooling requirements can be affected by:
The number and size of windows
Afternoon sun exposure
Ceiling height
Insulation
Open-plan living areas
Number of occupants
Room layout
Roof construction
How the home is used throughout the day
For example, a living room with large west-facing windows can become much hotter in the afternoon than a similarly sized room that receives little direct sunlight.
An undersized system may appear to work perfectly on a mild day because the cooling demand is relatively low. When Adelaide gets much hotter, however, the system may run continuously without catching up.
If the problem has existed since the air conditioner was first installed, the original system selection and cooling requirements should be reviewed before simply installing a larger unit.
2. Afternoon Sun May Be Overheating the Room
Does your home feel comfortable in the morning but become noticeably hotter around the middle or later part of the day?
Look at which rooms are affected.
Large windows and glass doors can allow substantial amounts of solar heat into a room. This can be particularly noticeable when direct afternoon sunlight reaches the glass for several hours.
You may see a pattern like this:
Morning: The air conditioner keeps the room comfortable.
Early afternoon: The room gradually becomes warmer.
Late afternoon: The air conditioner is running constantly, but the room still feels hot.
If that sounds familiar, the air conditioner may be dealing with a large amount of heat entering through the building rather than simply failing to cool.
Before changing the system, consider whether blinds, curtains, external shading or other measures can reduce direct sunlight during the hottest part of the day.
This is especially important in rooms that already have a high cooling load.
3. Poor Insulation Can Keep Adding Heat
The roof and ceiling can have a major effect on how a room feels during hot weather.
If insulation is inadequate, heat from the roof space can transfer into the living areas below. Your air conditioner then has to keep removing that additional heat.
This can explain why a room directly underneath a hot roof space feels uncomfortable even though the air conditioner has been operating for hours.
The clue is often that the problem is room-specific.
For example, if the downstairs living area feels reasonable but an upstairs bedroom becomes extremely hot every afternoon, look beyond the air conditioner itself.
Insulation, ceiling construction and heat entering through windows can all contribute to the problem.
In this situation, increasing the size of the air conditioner may not solve everything. Reducing the amount of heat entering the room can also make a significant difference to the cooling load.
4. Restricted Airflow Can Make the System Feel Ineffective
Sometimes the air conditioner is producing cooled air, but that air is not moving through the home properly.
Start with the simple things.
Check the filter according to the manufacturer's cleaning instructions. A dirty filter can restrict airflow and make the system work harder.
For a ducted system, check whether:
Supply outlets are open.
Furniture is blocking an outlet.
Return-air openings are unobstructed.
One area has noticeably weaker airflow than others.
For a wall-mounted split system, check whether anything is obstructing the indoor unit.
A useful clue is the difference between cool air and airflow.
If the air feels reasonably cool but there is very little air coming from the outlet, the issue may involve airflow rather than the system simply being unable to produce cooling.
Do not remove electrical covers or attempt to work on refrigerant components yourself. Those areas should be inspected by a suitably qualified professional.
5. The Outdoor Unit May Not Be Able to Disperse Heat Properly
It is easy to focus entirely on the indoor unit because that is the part you see inside the home.
However, the outdoor section is an essential part of the cooling process.
During cooling operation, the outdoor unit needs to release the heat removed from your home. If airflow around the unit is restricted, its operation can be affected.
Take a look at the area around the outdoor unit.
Has vegetation grown around it?
Are leaves and debris accumulating nearby?
Has somebody stored boxes, garden equipment or other objects close to it?
Has anything been placed directly over or around the unit?
Do not dismantle or relocate the outdoor unit yourself. Instead, make sure the surrounding area is not obviously obstructed and arrange a professional inspection if you suspect the installation or clearance is contributing to the problem.
The outdoor unit's position should also be considered when installing a new system. Placement is not simply about finding any available space outside the house.
6. The System May Have Lost Performance Over Time
A system that used to cool your home comfortably but now struggles every summer deserves a closer look.
Pay attention to changes rather than judging the system from one particularly hot afternoon.
Warning signs can include:
The system takes much longer to cool rooms.
It runs for much longer than it used to.
Airflow has become noticeably weaker.
Some rooms are consistently warmer.
The system has developed unusual noises.
Faults are becoming more frequent.
Cooling performance has gradually declined.
An older air conditioner does not automatically need to be replaced.
Sometimes a service or repair can address the problem. In other cases, repeated faults, age and declining performance can make replacement worth considering.
The important thing is to identify the cause before making that decision.
7. The Original Installation May Not Suit the Home
If an air conditioner has always struggled with the same rooms, look at the original design and installation as well as the equipment.
This can happen when a home has an unusual layout, multiple connected living areas, a renovation or an extension.
With ducted systems, for example, the location of outlets, return air, ductwork and zoning can influence how evenly cooling reaches different areas.
With split systems, the position of the indoor unit and the area it is expected to cool also matter.
A system can be technically operational while still not delivering the comfort you expect because the setup does not properly match the home.
This is why a professional assessment should look at the whole cooling system and the property, rather than assuming that the largest possible replacement unit is automatically the answer.
How Can You Tell Whether the Problem Is the AC or the House?
The pattern of the problem can provide useful clues.
|
What you notice |
What it may
indicate |
|
The whole home struggles during
extreme heat |
High cooling demand or system
capacity issue |
|
One bedroom stays hot |
Airflow, insulation, windows or
room-specific heat gain |
|
Cooling becomes worse every afternoon |
Solar heat entering through windows
or walls |
|
Air feels cool but airflow is weak |
Filter, ductwork or airflow
restriction |
|
The system has always struggled |
Sizing, design or installation issue |
|
Performance has recently declined |
Age, maintenance or component problem |
|
Outdoor area is crowded around the
condenser |
Restricted airflow around the outdoor
unit |
|
System works well on mild days but
struggles during extreme heat |
High heat load may be exposing a
capacity or building issue |
On the other hand, if the whole house has become increasingly difficult to cool and the system is also experiencing faults, a professional assessment of the equipment may be appropriate.
What Can You Safely Check Yourself?
Before calling a technician, there are several basic checks you can make.
Check the filter
If your system has a user-accessible filter, check it and clean it according to the manufacturer's instructions.
Check your vents
For ducted systems, make sure outlets are open and not blocked by furniture or other objects.
Look at the outdoor unit
Make sure obvious leaves, branches or stored items are not restricting the area around the unit.
Look at your windows
If the problem is significantly worse when afternoon sun hits a particular room, consider how much direct heat is entering through the windows.
Check doors and windows
If you are using refrigerated air conditioning, leaving external doors or windows open while cooling can make it much harder for the system to maintain the indoor temperature.
Pay attention to the pattern
Note when the problem starts, which rooms are affected and whether the system performs normally on cooler days.
That information can be surprisingly useful when a technician investigates the issue.
Avoid opening electrical panels, handling refrigerant components or attempting repairs yourself.
When Should You Consider Replacing the Air Conditioner?
Replacement should not be the automatic response to one hot day.
However, it may be worth discussing your options if you have several problems at the same time, such as:
Repeated breakdowns
Increasing repair requirements
Consistently poor cooling
Significant differences between rooms
A system that is no longer suitable after a renovation
A system that has struggled since installation
An older system with declining performance
If replacement is being considered, the new system should be selected according to the current home, not simply based on what was installed previously.
Your home's layout, insulation, windows, room usage and cooling requirements all matter.
Everything Air Conditioning provides a range of heating and cooling solutions for Adelaide homes, including ducted reverse cycle, wall split and evaporative systems.
You can learn more about the air conditioning options available for Adelaide homes before deciding which type may suit your property.
How to Reduce the Cooling Load During Adelaide's Hot Weather
Your air conditioner is only one part of keeping a home comfortable.
During very hot weather, simple changes can reduce the amount of heat entering the home.
Try to:
Close blinds or curtains before strong afternoon sunlight enters.
Use external shading where practical.
Keep doors and windows closed when using refrigerated cooling.
Keep accessible filters clean.
Avoid blocking supply and return-air openings.
Check whether particular rooms have insulation or heat-gain issues.
Have an older system inspected before the next major heatwave.
These measures will not fix a faulty air conditioner, but they can help you determine whether the problem is related to the home's heat load.
If you are considering a new system, Everything Air Conditioning can assess your requirements and provide heating and cooling options suited to your home and environment. The company states that its Adelaide team handles both installation and servicing and offers a range of system types.
Don't Assume Your Air Conditioner Has Failed
When an air conditioner struggles during Adelaide's hottest weather, the obvious reaction is often to assume that the unit is broken.
Sometimes it is.
But sometimes the equipment is working while dealing with a much higher cooling load than it normally experiences.
The most useful clues are when the problem happens, which rooms are affected, whether airflow has changed and whether the issue has existed since installation or developed recently.
Those details can help separate a capacity issue from restricted airflow, solar heat gain, insulation problems, outdoor-unit restrictions or an ageing system.
If basic checks do not explain the problem, getting the system assessed is more useful than guessing or immediately replacing equipment.
For homeowners considering air conditioning solutions in Adelaide, Everything Air Conditioning offers installation and servicing across Adelaide and can help assess the available heating and cooling options for a particular property.
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