What Size Dehumidifier do I Need?

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What Size Dehumidifier do I Need?

Selecting the correct extraction rate or tank capacity is crucial when purchasing a dehumidifier. However, understanding what size truly signifies and how it impacts water extraction can be confusing. In this article, we will cover the fundamentals of size to assist you in choosing the most suitable dehumidifiers for your home.

What is a dehumidifier?

A dehumidifier is an essential appliance that helps to control the humidity of your home. It works by removing excess moisture from the air, thus creating a more comfortable living environment. If you are in the market for a dehumidifier, the first step is to determine which type is best for your needs. So read on to find out which size is best.

What is dehumidifier size?

image of a hand holding a remote control pointing it at a portable air conditioning unit

What is the true measure of a dehumidifier's size? It's not about physical dimensions, but rather the litres of water it can extract per day, which is known as its 'extraction rate'. This is measured as the amount of water the dehumidifier can extract from the air within a 24-hour period, when operating at a certain temperature. So when we say that a dehumidifier has a size of 12L, what we really mean is that it has an optimal daily extraction rate of 12 litres of water. Although larger capacity models are typically bigger, it's important to note that size doesn't always directly relate to capacity.

The tank capacity, which is typically between 2-6L, is separate from the extraction rate. It is important to note that the tank size is usually smaller than the daily extraction rate. However, this does not mean that you will need to empty the tank multiple times per day. It will be dependent on how much humidity you have present in your home and the daily temperature.

Extraction rate refers to the amount of water the unit can extract from the air (e.g. "Extraction rate is the amount the dehumidifier can comfortably extract in a 24hr period."). Tank capacity to refer to the amount of water the unit's storage tank can hold (e.g. "The tank capacity, which is typically between 2-6L, is separate from the extraction rate.").

How to choose a size?

Every brand specifies the extraction rate of their machines, which serves as a useful measurement for comparing different models. However, it's important to note that this number represents the maximum extraction achievable under ideal conditions. When it comes to dehumidifiers, their effectiveness is not solely determined by their stated extraction rate. Factors such as temperature and humidity play a significant role in how much moisture they can extract from the air. However, this doesn't mean that their extraction rate should be overlooked. Generally, the higher the extraction rate is, the better equipped the unit is to handle bigger spaces and higher levels of moisture. If you only need to manage humidity in a small room with mild dampness, a low extraction rate such as 8 - 10L might suffice. However, if you're looking to dehumidify multiple rooms or an entire house, opting for a dehumidifier with a larger extraction, such as a 20-30L is essential. For more information, check out our Dehumidifiers Buying guide.

Dehumidifier size recommendation chart

1 bedroom
single story
2 bedroom
single story
3 bedroom
single story
up to 5 bedrooms
single story
up to 6 bedrooms
single story
Slightly damp
Light condensation
No to mild mould
5L 10L 12L 20L 25L
Moderately damp
Musty smells and mould
5L 12L 12L 20L 25L
Very damp
Very cold house and mould
10L 12L 20L 25L 25L
Condensation on walls
Mould on furniture
12L 20L 20L 25L 25L

Which dehumidifier is best for small rooms?

If you only need to dehumidify a small room, such as a bedroom or bathroom, it's essential to select the right extraction rate. You want to ensure that the dehumidifier is powerful enough to extract excess moisture, but not too large and overpowering for the space. Typically, a dehumidifier with an extraction rate of 8-12L would be suitable for a small room. We recommend...

MeacoDry 12L Arete® One Dehumidifier White

The MeacoDry 12L Arete® One Dehumidifier White is the perfect solution for removing excess moisture from your home. Designed specifically for use in UK homes, this dehumidifier is both effective and efficient, helping to maintain a healthy and comfortable living environment. With its stylish design, the MeacoDry 12L Arete® One Dehumidifier White is a practical addition to any home, and the included 5-year warranty provides peace of mind.

Which dehumidifier is best for large rooms?

For spacious areas like living rooms or open plan spaces, it is crucial to select a dehumidifier with a higher extraction rate. A 20-35L dehumidifier would be better suited for these types of spaces as it can efficiently extract moisture from the air in larger areas. We recommend...

Honeywell 33L TP BIG Energy Star Compressor Dehumidifier with Dust Filter

The Honeywell 33L TP BIG Energy Star Compressor Dehumidifier with Dust Filter is an excellent investment for those who are dealing with excess moisture in their homes. The dehumidifier is packed with features that aim to simplify the user's life. One such feature is the water tank alarm, which alerts the user when the tank is full. The full tank auto shut off ensures that the unit stops working when the tank is full, thus preventing any further damage or leaks. The continuous drain option is another convenient feature that allows for easy draining of the water into a sink or a drain. The draining hose supplied with the unit makes the process even simpler. The dust filter helps to keep the air clean and pure, making it a must-have for those who are sensitive to allergens.

Which dehumidifier is best for bathrooms?

A dehumidifier is an electrical device, so it's important to be careful when using it in a wet environment like a bathroom. But since the bathroom is one of the most humid areas, it needs some help to get rid of excess moisture and prevent the build-up of mould and mildew in corners and between tiles. The best spot to place your dehumidifier for extracting moisture from a bathroom is in the hallway or landing, by the bathroom door. However, many dehumidifiers require about a meter of space from the wall, which could make this scenario a bit tricky. We recommend...

The Meaco Arete range

The Meaco Arete range can be placed directly next to the wall and have been designed with UK homes in mind. Simply position it in the hallway, right next to the bathroom door, and watch as it effortlessly eliminates any excess moisture.

Which dehumidifier is best for bedrooms?

If you're drying laundry in bedrooms or noticing condensation on windows overnight, you might be wondering which dehumidifier size is best suited to your needs. Generally, a dehumidifier with an extraction rate of 10-20L would be ideal for use in bedrooms. We recommend...

Devola 12L Compressor dehumidifier

The Devola 12L Compressor dehumidifier is a must-have for any home or office seeking to improve their indoor air quality. This freestanding unit is thoughtfully designed with smooth gliding casters, allowing you to easily move it around as needed. The addition of a dust-proof filter ensures that the air being circulated is clean and healthy to breathe. Parents can rest easy with the inclusion of a child lock and auto tank shut off safety feature, providing peace of mind that little hands won't accidentally tamper with the unit. With its ability to remove up to 12L of moisture per day, the Devola 12L Compressor Dehumidifier is a reliable and efficient solution to create a comfortable and healthy environment for all.

When it comes to choosing the perfect dehumidifier size, there are a few key factors to consider. You'll want to think about the humidity level and temperature in your home, as well as the space you need to dehumidify. It's crucial to select a dehumidifier with the right extraction rate that meets your specific needs for maximum efficiency and effectiveness.
With a wide range of dehumidifiers available from top brands, AirCon Centre is here to help you find the perfect size and type of dehumidifier for your home.