September 7, 2026
If your home feels sticky and damp even when the air con is running, you might think you need to buy a separate dehumidifier. In many cases, you don't. Most modern air conditioners already have an air conditioner dehumidifier setting built in. Manufacturers call it “Dry Mode,” and many people overlook this feature on their air conditioner remote.
In Sydney's humid summers, this setting can make a difference to comfort, health, and your energy bill. Here is what it does, how it works, and when to use it.
So, what is dry mode on an aircon? Dry mode is a setting that pulls moisture out of the air without cooling the room as hard as normal. Instead of blasting cold air to bring the temperature down, the unit runs slowly and steadily to remove dampness from the room.
This is different to cooling mode. The cooling mode chases temperature, and dry mode chases humidity.
The exact way Dry Mode works can vary between air conditioner models. Always check your ac system instructions for the correct operation of your system.
An air conditioner dehumidifier setting works in a simple way. The unit draws warm, moist air from your room over a cold coil inside the indoor unit. As the air cools, the moisture in it turns into water and collects on the coil. The water drains away and drier air is sent back into your room.
This can be useful when the temperature is not especially high, but the air still feels damp.
For example, you may notice:
Because the goal is to remove moisture rather than drop the temperature, the fan runs slower and the compressor uses less power than it does in cooling mode. This is why running your ac on dry mode often costs less than running it on full cooling.
This is the question most homeowners want answered. If your air conditioner already has a dry mode, you may not need to buy a stand-alone dehumidifier at all.
A dedicated dehumidifier suits damp spaces, such as laundries or homes near the coast. For everyday humidity, Dry Mode on your air conditioner can often do the job well.
If you already have air conditioning and only deal with occasional humidity, your system's Dry Mode may be enough. If moisture is an ongoing problem, a dedicated dehumidifier can give you more targeted humidity control.
High humidity makes a room feel warmer than it is. Turning on the air conditioner dehumidifier setting removes that sticky, heavy feeling from the air. This allows your home feels cooler without you having to drop the temperature.
Mould and mildew both need moisture to grow. Keeping your home dry is one of the simplest ways to manage mould and air conditioning problems together. Running dry mode regularly keeps humidity down, which makes it much harder for mould to take hold on walls, ceilings, and window frames.
Damp air helps dust mites and mould spores multiply. A dry air conditioner mode setting lowers humidity. This can reduce these triggers and make breathing easier for people with allergies or asthma.
Moisture damages wooden furniture, electronics, books, and clothing over time. Running your dry mode ac unit regularly helps protect household items and keeps your home in better condition.
Because dry mode uses less power than full cooling, switching it on during muggy weather can reduce strain on your system and lower your running costs.
Sydney's climate makes dry mode useful for most of the year, not just summer. Try switching your air con on dry mode during:
If your current system does not have a reliable dry mode, or you are noticing damp patches and musty smells no matter what setting you use, it may be time for an upgrade.
At Roberts Air Conditioning we install residential systems across Sydney built to handle our humid summers properly.
Explore our residential air conditioning services to find a unit that suits your home.
What is the dry setting on the air conditioner used for?
It is used to remove excess moisture from a room without cooling it as much as normal. It is ideal for humid days when the temperature is already comfortable but the air feels damp.
Does dry mode use less energy than cooling mode?
Yes. Dry mode runs the fan and compressor at a lower level than cooling mode. It generally uses less power while still improving comfort.
Can dry mode replace a dehumidifier completely?
For most homes, yes. If you only deal with everyday humidity, your air conditioner dehumidifier setting is usually enough. Homes with serious, ongoing damp problems may still benefit from a dedicated dehumidifier as well.
Will using dry mode help with mould in my home?
Using dry mode can help lower the humidity in your home. Lower humidity makes it harder for mould to grow. Using dry mode regularly is a useful part of managing moisture in your home.
Is dry mode the same on every air conditioner brand?
The idea is the same across brands, though the name and exact performance can vary. Whether you have a Fujitsu, Daikin, or Mitsubishi system, look for a droplet icon on the remote to find the setting.
