What is a Dehumidifier Used for?

Posted on October 14 2018

What is a Dehumidifier Used for?

Is your home being ruined by damp? Whether you have a damp problem with your building or your moisture derives from cooking or drying laundry indoors, the result can be displeasing. Musty smells and mould growing on your walls can lead to a risk of respiratory illness. It can take time to resolve major damp problems, so what can you do in the meantime? One of the most selective solutions is to invest in a dehumidifier.

The Dehumidifier: What is Humidity?

We often don’t think about the atmosphere in are home. After all, it’s invisible! If we were to think about it, we would usually just think of it as gas. Look to the skies and you will see things differently. Clouds above you are filled with water as either a vapor or liquid, depending on whether it’s raining or not. This is true to your home as well. You may think the air is dry, but there is a lot of moisture around you. If you cook or dry your clothes indoors without the right ventilation, humidity can be quite high. Condensation on the windows is a sure sign of a humidity problem.

Why does Indoor Humidity Matter?

Humans are usually 60 per cent water, but that does not mean our homes should be too! High humidity can cause many problems. It can make your clothing go mouldy, it can be terrible for your tech and, most of all, it’s bad for your health. In fact, a study in 1986 found that high levels of indoor humidity can encourage bacteria, viruses, mites and fungi.

What does a Dehumidifier do?

A dehumidifier is like a vacuum cleaner for air. It takes the air from one end of your room, removes the moisture and blows it back out. The moisture drips into a collection tank that must be emptied from time to time. How is the moisture removed? That is where a dehumidifier acts similar to an air conditioning unit. Confused? Let’s look inside a dehumidifier to see its capabilities!

How a Dehumidifier Works

Dehumidifiers work in one of two ways. The first is by refrigeration, cooling the air to remove the moisture, or by absorption, where moisture is sucked into a drying material and then removed. We shall look at how each one works.


First of all, warm and moist air is sucked in through a grille on one side of the machine and an electric fan draws the air inward. The warm air passes over freezing cold pipes that are circulated by a coolant. As the air cools, the contained moisture turns back into liquid and drips downward of the pipes.

Free form moisture, the air passes over a heating element and returns to its original temperature. Warm, dry air blows back out through another grille. The moisture is now in a collecting tray at the bottom of the machine. A plastic float in the machine will rise as the collecting tray rises. When the tray is full, the float trips a switch. The fan will turn off and an indicator light will tell you that the machine needs emptying.


Some dehumidifiers work by soaking up the moisture from the air with a water holding material. It then “squeezes” the water away.

How does it Work?

Moist air goes through a duct and moves past a large rotating wheel made of water-absorbing material. The humidity is then removed. The air is drawn by a fan and dry air is blown back into the room. An air duct is kept hot, and a moisture absorbing wheel rotates through the heated air space. Hot air blows past it to dry it out.

How to Compare Dehumidifiers

According to The Code of Federal Regulations of the United States of America, there are two main measurements you can use.

Daily Water Removal

The simples one is how much water a dehumidifier can remove in a day. Bigger machines will draw out more water than smaller ones. You can best test this with water you need to shift quickly. This is often emergencies such as a river flood as you will only use it this way for a short amount of time.


If you’re using a dehumidifier for much longer, you will need to see how much power your machine consumes. The best measurement is the efficiency of the machine. This is essentially how much water it removes divides by how much power it uses, measured in litres or per kilowatt hour.

What about the wattage?

The wattage alone is not enough to determine how good a dehumidifier is. However, a higher wattage means the machine will be working harder and removing more water per hour. A typical mini table-top dehumidifier uses about 20 watts and extracts 250 ml per day. It also has a tank capacity of 500ml.

Check out the Wohome 550ml Portable Electric Mini Dehumidifier

The WoHome portable dehumidifier has an automatic power-off function. When water capacity is reached, it will turn off and an indicator light will remind you to empty the tank. It also comes with an eco-friendly function! If you’re considering a dehumidifier for your home, check it out here.

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