Australian Dehumidifier Buying Guide
What is a Dehumidifier?
A Dehumidifier decreases the humidity (moisture) in a room. By reducing condensation and damp, they help prevent mould, mildew, and dust mite activity - which can help people with being comfortable, breathing, and allergies. Dehumidifiers remove moisture from the air removing anywhere from 1 litre upto(in some circumstances) 25 litres of water every day. That moisture and condensation that is taken into the dehumidifier is then released into a removable holding tank inside the device that you empty as needed or via a continuous drainage pipe.
Why do I need a Dehumidifier?
- To help prevent mould and inhibit dust mites’ activity.
- Assist those with asthma and breathing difficulties.
- Comfort in humid/hot sticky climates.
- Manage damp in homes due to leaks and poor ventilation.
- Manage moisture in the bathrooms
- Manage mildew in wardrobes.
- Dry clothes (in Asia dehumidifiers are frequently used as an alternative to a tumble dryer)
How do Dehumidifiers work ?
There are different types of Dehumidifiers in the market today and it’s essential for you to know what best fits your needs. Dehumidifiers are classified based on the technology used to extract moisture from the air – they may be classified as Desiccant, Compressor, or Thermo-Electric Peltier.
Desiccant Dehumidifiers absorb moisture from the air using a desiccant material (similar to silica gel that you are probably familiar with or you find in sachets with electronic goods or vitamin bottles). As air circulates through the dehumidifier, moisture is absorbed by the desiccant material.
The desiccant material is then heated to release the moisture into the dehumidifier’s water tank and the desiccant material is then reactivated. Since it doesn’t use a compressor, many customers prefer the desiccant dehumidifiers because they are lighter and quieter in operation.
They also work better over a wider range of temperature - especially in winter. The desiccant dehumidifiers have a consistent performance regardless of the temperature. So, any application whereby the room air temperature is likely to fall below 15°C then you should be looking at a desiccant dehumidifier.
Compressor Dehumidifiers work similarly to a refrigerator. They use the same technology to create a cold surface. When warm air hits the cool surface, condensation forms and water is removed from the air.
However, to work efficiently, a compressor based dehumidifier relies on their being a large temperature difference between the warm air and cool surface. As a result, compressor based dehumidifiers don’t work well in cooler temperatures or winter conditions and are better suited to warmer climates.
Thermo-electric Dehumidifiers use the thermoelectric effect to convert electricity into a temperature difference across a Peltier module. They then work similarly to a compressor based dehumidifier causing water to be extracted by condensation of warm air on a cool surface.
This created temperature difference is what facilitates dehumidification. Thermo-electric dehumidifiers are energy efficient and suit smaller spaces and work better in warmer climates.
Which Dehumidifier is best?
How much space do I need to dehumidify?
It's important to choose the right size dehumidifier. Otherwise, the unit may not be able to remove enough moisture from the air—to maintain the desired humidity level. For best results, select the right size unit based on the area (in square meters) of the space you need to dehumidify. If your space is at the high end of a dehumidifier's capacity, choose a larger size to ensure efficiency.
Temperature range in the room you are placing it in?
The technology used in the Dehumidifier will determine which temperature range it will work efficiently in. Desiccant dehumidifiers work over a wide temperature range, working efficiently in both winter and summer. Compressor and Thermo-electric work best in warmer climates or warmer temperatures.
How will I eliminate collected water?
All dehumidifiers collect the water that they remove from the air, and you should consider how you will eliminate this water. Standard dehumidifiers contain buckets that you must empty regularly. They will automatically shut off when the bucket is full. Some dehumidifiers allow you to connect a drain hose to them, which allows you to empty the water into a floor drain or direct it outdoors.
Do I require any special features?
Different dehumidifiers come with various features, such as Humidistats. Humidistat allows you to set and forget the desired humidity level or range. The dehumidifier then automatically maintains that humidity level so that the air you breathe is comfortable, balancing the percentage of water vapour in the air and maintaining a healthy environment. Some special features include caster wheels or handles for easy mobility, air filters, digital controls, remote controls, integrated timers, and internal condensate pumps.