Extract Water From Air: Does a Room Dehumidifier Work?

Dehumidifier Critic / Extract Water From Air: Does a Room Dehumidifier Work?

While there are some similarities between one-room air conditioners and room dehumidifiers, they are still different machines with different purposes. However, both use condensers similar to what you would find on a refrigerator, freezer, or air conditioner. This means that a room dehumidifier uses refrigerant to absorb water vapor from the air inside your home.

To know more about how dehumidifiers extract water from the air, read the following article.


A dehumidifier converts wet air into dry air by cooling down in a process similar to refrigeration or air conditioning. The result may be a horrible smell, mold growing in walls and clothing, and a greater risk of respiratory symptoms. Undoubtedly this solution will solve problems of moisture in the air and thereby dehumidify moistures.

Related Article: Dehumidifier Types: What Type for Basement, Home & Industrial?

What Does a Dehumidifier Do?

A dehumidifier is an appliance that takes moisture from inside a home. If you or your family members are suffering from asthma or allergies it could help alleviate symptoms.

When someone complains about humid environments they do so usually because it is related. The relative humidity is the ratio of air vapor to water vapor. For a typical home with a temperature of 68 degrees Fahrenheit relative humidity should ideally be between 30 and 50. Dehumidifiers remove moisture in your home enhancing comfort and health.

What Are We Called Humidity?

Humidity is the amount of water vapor in the air. For example, if you live in a dry climate and notice that your skin feels tight and uncomfortable, this is called low humidity. On the other hand, an environment with high humidity will make your skin feel moist and clammy; such as after taking a steamy shower or sitting next to a swimming pool.

Dehumidifiers remove these vapors or squeeze them out of the air when they are in use. A dehumidifier helps you decide if it is necessary for your room or not.

Why Does Humidity Matter in Your Home?

Using extreme high temperatures could also cause mold and rusting of a laptop computer and cause short circuits. In turn, it can cause respiratory infections and health issues. Currently, most adverse health effects are associated with relative humidity if there’s an ambient humidity level of 40 to 60% of the home he reported in 1986. The study says the humidity should be kept at around 60% in a residence of a person having a low level of humidity but not just 40% but 60% in the house.

Does a Dehumidifier Extract Water From the Air?

Yes, a dehumidifier extracts water from the air. This process of dehumidification is very similar to air conditioning and refrigeration. Dehumidifiers extract water from the air and convert it into a liquid form, which is then collected in a tank for future use.

The word adsorption and absorption describe how the process works in different types of dehumidifiers:


In an absorption dehumidifier, there is a tank that holds a saturated dilute solution of lithium bromide and calcium chloride. As it cools and condenses, water passes from the air to the tank.

Related Article: Desiccant Dehumidifier: What Is It & How It Works? (Absorption)


In a dehumidifier (d-sorb) there is a non-volatile material that absorbs or draws water vapor from the environment by means of an absorbent process. Also, in this type of dehumidifier, a fan blows air into the unit and across a cold coil. This cold coil is filled with a material that extracts water vapor from the air passing by it, similar to how a dry towel will wick up water from wet hands.

Where Does the Water Come From in a Dehumidifier?

The water collected in a dehumidifier may originate from different sources. It is likely that the water comes from condensation, which means that it’s possible to find little drops of water on your windows when they are cold during the winter months. Because moisture collects directly onto the windows, this explains why there are small drops of water or even rain when the window is cold.

Alternatively, this water could also come from its surroundings, which means there are some cases when this water comes out of the air. This “environment” refers to any place in your home or business that has moisture in it.

Manufacturers have been happy to make demands between 10 and 20 liters in a day on most smaller domestic dehumidifiers and up to 50 liters of bigger models.

How Does a Dehumidifier Collect Water?

The quantity of water retrieved using the air depends solely on the device’s capacity. Air travels through a coil that is cooled by a refrigeration system to relatively low temperatures. There will be condensation of water vapor. The water collected by evaporators will be emptied into collection tanks below the dehumidification.

The amount of water extracted from the device is determined reliant on the capability of the device depending on the water taken from the air. The device is controlled by a device whose capacity of water is approximately 80% of room temperature.

How Long Does It Take for a Dehumidifier To Start Collecting Moisture From the Air?

The dehumidifier does not take much time to start collecting water vapor from the air. Dehumidifiers typically take about 3 minutes to start removing moisture from the air once they start running. However, this time can be reduced if it’s in the weather or climates that are “wet.”

While using a dehumidifier, you need to let it run for an hour or two and see if there is any water in the collection bucket. If there is no fluid in the bucket, either your machine is defective or you do not have enough moisture in the air for it to work.

Will Desiccant Dehumidifiers Always Collect Water?

Desiccant dehumidifiers don’t involve water collecting but rather absorption. The size of the container or tank will vary between various models and will require emptying either manually or using the drain hose. It could depend on the moisture that was removed from the air in accordance with the RH levels or the humidity level used to measure them.

The capacity of the water tank will depend on how frequently you run your dehumidifier, its capacity, and the quantity of moisture taken from the atmosphere based upon RH levels.

Related Article: Desiccant Dehumidifier: What Is It & How It Works? (Absorption)

Why Does My Dehumidifier Fill Up so Quickly?

Dehumidifiers that are filling up quickly are possible due to a lack of water in the air. This situation can be due to factors such as an increase in the humidity level in the crawl space or basement caused by a crack in a pipe, excess moisture in the laundry room, etc. Having humidity detectors can help monitor the humidity levels in your home accurately.

How Much Water Does a Dehumidifier Extract in a Day?

The water accumulated by dehumidifiers during a particular month is relative. It can absorb between 10 and 100 pints of water depending on how it’s consumed and humidity inside your living space.

Factors and quantities as measured by a machine: current room temperature, RH levels, relative humidity, percentage moisture from the air in your home, water vapor in the room, the power level of the machine, filtration ability of the instrument. This factor will determine how much water a device can store. It’s important that you do it in every house to make sure if the house’s structure is not damaged by excessive moisture.

When Does a Dehumidifier Stop Collecting Water?

Some dehumidifiers have automatic dehumidifying features. Water collected by this device may end once the humidity is controlled inside your home. The second thing that may stop water is the problem of the device. A dehumidifier will detect them and reduce a condition such as moisture extractor function.

Dehumidifiers Can Create a Healthier Environment

By eliminating mold growth and dust you eliminate invaders like silverfish and cockroaches in your home. Less humidity may be good for people with COPD. A dehydrator can cool the house a lot better in natural humidity and reduce the use of your air conditioner to cool it down, which can also lead to lower electric bills.

Dehumidifiers Help Control Asthma

When air is moist it is heavier and often harder to breathe out. Dehumidifiers can make breathing harder. Mugginess has disappeared and it’s more cold and warm. According to one study, there exists little evidence linking dehumidifiers or lung dehydration to asthma attacks.

Related Article: What Does Dehumidifier Do: Health Benefits and Side Effects

Dehumidifiers Help Reduce Allergy Symptoms

Dust mites require a humidity level of 65 percent to survive and proliferate. This level can be easily controlled with a dehumidifier. Dehumidifying the air reduces mold growing in the house.

Related Article: What Does Dehumidifier Do: Health Benefits and Side Effects

Do You Need a Dehumidifier?

Most noticeable signs of excessive humidity in a home may include rotten and deteriorated wood mold and fungi infection. Dehumidifiers can reduce the health effects of common allergies for dust mites, fungus, and mold.

You may also need a humidity regulator in rooms that are wet or damp. This is because they are usually around places like bathrooms, basements, and kitchens where there is excess moisture in the air. These devices can reduce allergens in the house by removing dust particles from the air circulating in your living space.

Related Article: How Do I Know I Need a Dehumidifier?

Extracting Water From the Air Using Dehumidifier FAQs

Will a dehumidifier pull more moisture from warm or cold air?

A dehumidifier works in the same way regardless of whether it’s using cold or warm air. The difference is in the room and its temperature.

How does a dehumidifier remove the water vapor from the air?

The process of removing water vapor from the air is an evaporation process. When you put a liquid in a container and remove the container, the liquid will evaporate once it reaches a certain temperature due to heat. This is what a dehumidifier does to release moisture from the air so that it may be collected in a container.

Would putting a dehumidifier in an area where water was spilled on the carpet help it dry faster?

A dehumidifier can help remove the extra moisture from the carpet. It cannot help it dry faster because a dehumidifier works with absolute humidity, not relative humidity.