A house owner using dehumidifier to remove moisture from the room

How Does a Dehumidifier Work for Damp?

Key Takeaways

  • A dehumidifier draws in moist air, cools it so water condenses out, then releases drier air back into the room.
  • Removing excess moisture helps prevent mould, mildew, musty odours and protects walls, floors and timbers from damp-related damage.
  • Although very useful for managing condensation-related damp, a dehumidifier does not fix underlying building issues like leaks, rising damp or missing damp-proof courses.
  • Efficiency depends on the size of the room, how damp the environment is, and how well the unit is placed and maintained.
  • For best results: choose a model suited to the space, use a hygrometer to monitor humidity levels, and keep doors/windows closed while in use.

So, what happens when damp shows up in a house? Wetness, moisture, relative humidity, water patches, or whatever other term that reflects the presence of water in the home is what happens. Damp in a house is one of the worst situations that can occur.

There are wet patches on the wall, flaking plaster, bad smells, high humidity, and a lot of other things that occur in a damp-affected house. And it’s tough to fix this situation.

The water accumulation on damp walls does not go away that easily. Even if the excess water has been cleared, there are some amounts of moisture that are still left – in the form of patches that take a lot of time to dry.

However, there are some devices that can help speed up the drying process of wet clothes.

These devices are dehumidifiers. Dehumidifiers suck all the excess moisture present in a house and make the area to be drier. But how does that work? Let’s find out.

A dehumidifier in the house

 

 

How Does a Dehumidifier Work?

So, dehumidifiers are one of the best things out there for moisture control. They’re designed to tackle issues like condensation, prevent mould growth, and keep your walls from turning into a damp mess.

The key players in this game are the refrigerant (or compressor) dehumidifiers and the desiccant dehumidifiers.

Refrigerant Dehumidifiers

To understand refrigerant dehumidifiers, you have to imagine a mini-fridge, but instead of keeping your snacks cool, it’s pulling in warm air with the help of a filter and passing it over to the cold coils.

As the air chills out on these coils, the water from the air condenses and drips into a water tank. These refrigerant types are more effective in warmer rooms because they need the air to be warmer than the coils to work.

However, there’s a catch. If the room gets too cold, these coils might get frozen. When that happens, the dehumidifier goes into defrost mode, spending time and energy thawing out instead of collecting water. So they might struggle in the cold.

Desiccant Dehumidifiers

A desiccant dehumidifier is all about heat. These dehumidifiers use an adsorbent material to yank moisture from the air. This material then gets heated up, and the collected water vapor drips into the tank. The cool part is that they aren’t picky about temperature, making them the go-to for colder environments like garages, conservatories, or unheated basements.

However, there’s still a trade-off. Because they use heat to warm up the adsorbent material, desiccant dehumidifiers can be a bit more energy-hungry. They also give off more heat, which might not be ideal if your place is already cosy.

How to Choose the Right Dehumidifier?

The deal is that if your dehumidifier is destined for a warm and toasty room, the refrigerant type is the one to go for. But if it’s going to face the chill in an unheated space or deal with various conditions, the desiccant is the way to go.

And there are some refrigerants that handle the cold surprisingly well, but they might not be as thrilled in warmer temperatures. British weather can be a bit tricky, you know? Also, keep an eye on how the defrost function is set up. Less time defrosting means more time collecting water.

A dehumifier in the garage of the house

 

 

When to Use a Dehumidifier?

At your home, when suddenly everything feels kind of moist and clammy, that’s when a dehumidifier must be used.

First off, these things are great for areas that tend to be damp, like basements. Basements are like magnets for moisture, and that’s where mould loves to incur. A dehumidifier swoops in and kicks that extra moisture out, preventing mould from setting up and making your place smell like a dirty, smelly place.

Bathrooms are another dehumidifier hotspot. Hot showers are fantastic, but they turn your bathroom into a humidity hotspot. If you’re tired of feeling like you need help to breathe comfortably after a shower, a dehumidifier can help by sucking up that excess moisture.

And let’s not forget those times when the weather decides to be more on the humidity side. If your home starts accumulating more humidity, a portable dehumidifier can can get things back to a more comfortable level.

In a nutshell, if your space feels too sticky, smells funky, or you’re just tired of that perpetual damp, that’s the cue to use the dehumidifier and let it work.

An advanced dehumidifier

 

 

Is Using a Dehumidifier Worth it?

Absolutely, a dehumidifier helps against the damp that can make your home feel muggy and uncomfortable.

When there is damp problem there’s too much humidity hanging around, things start to feel kind of icky. Your clothes might feel damp, and the air can be heavy – not the ideal cosy atmosphere.

Now, the best thing about dehumidifiers is that they suck that excess moisture right out of the air.

It’s more like having a humidity control button for your home. And why does that matter? Well, aside from the obvious comfort factor, it helps prevent mould and mildew from showing up on your walls.

A dehumidifier is worth it in the battle against stickiness. It’s convenient in places like basements or bathrooms where moisture tends to hang out a bit too much.

So, in a nutshell, using a dehumidifier isn’t just about comfort – it’s about keeping your space fresh, dry, and mould-free.

Container of a dehumidifier being changed

 

 

Can a Dehumidifier Help in Reducing Damp and Mould?

When you have excess moisture in the air, it becomes a breeding ground for mould and mildew.

They love that humid environment. Now, what a dehumidifier does is pretty straightforward – it sucks in the moist air, cools it down, and then collects the water in a tank or drains it out. As a result, you’re left with air that’s way less humid.

By reducing the humidity, you’re essentially putting up a big no-entry for mould. They thrive in damp, so when you take away the moisture. No moisture, no damp problems or mould growth – it’s like giving your home a protective shield against fungi.

And it’s not just about preventing mould; dehumidifiers also help in making your space more comfortable. A dehumidifier keeps things cool and dry, making your living space way more enjoyable.

So, in a nutshell, a dehumidifier is your go-to gadget for taking damp and mould to the curb while turning your place into a comfy, mould-free zone.

 

Is it Safe to Use a Dehumidifier?

Yes. Using a dehumidifier is totally safe and can actually be pretty darn helpful. Here’s why:

Mould Prevention

Dehumidifiers are meant for moisture control. They suck up excess moisture from the air, which is a big deal because too much moisture can lead to mold growth, mould and mildew.

Comfort Level

Besides saving you from a potential mould invasion, a dehumidifier can also make your living space more comfortable. It helps in maintaining cool air and an optimal humidity level, preventing that sticky feeling.

Health Benefits

Controlling humidity is not just about keeping your home cosy. It’s also good for your health. High humidity can make breathing difficult, especially for people with respiratory issues. A dehumidifier helps in creating a healthier indoor environment.

So, using a dehumidifier is a smart move for a comfy, healthy home. Just keep it in check, and you’re good to go!

Wrapping it up

The emergence of damp in a household signifies the unwelcome intrusion of wetness, moisture, and high humidity, manifesting in various issues such as water patches leaking pipes, flaking plaster, and unpleasant odours.

Addressing this predicament proves challenging as residual moisture persists even after initial water removal.

Enter dehumidifiers, ingenious devices designed to expedite the drying process by extracting excess moisture.

The functionality of these devices hinges on a comprehensive understanding of their inner workings that effectively combat the persistent damp in a house.

Frequently Asked Questions

How exactly does a dehumidifier work?

It pulls air into the unit via a fan, cools the air so that water vapour condenses on coils, collects the water in a tank or drain hose, and then expels the now drier (and slightly warmer) air back into the room.

Will a dehumidifier cure all types of damp in a house?

No. It is effective for reducing atmospheric moisture and condensation-related issues, but it will not by itself resolve structural damp causes such as rising damp, leaks, poor insulation or damaged gutters.

What humidity level should I aim for with a dehumidifier?

Generally, keeping indoor relative humidity in the range of 30%-50% is considered good for both the building fabric and occupant health.

Can a dehumidifier be used in any room?

Yes, but effectiveness depends on matching the unit’s capacity to the room size, ensuring good air circulation, and avoiding placing it in overly cramped or obstructed spaces.

How often do I need to maintain a dehumidifier?

You should regularly empty or drain the collection tank, clean or check filters, and ensure the device is kept clear of dust and obstructions so it can run efficiently.

Picture of Sam Fitzgerald – CSRT Damp Surveyor

Sam Fitzgerald – CSRT Damp Surveyor

Author – CSRT Damp Surveyor
Sam is a highly qualified and seasoned damp surveyor with over ten years of specialised experience. With a strong academic foundation in building surveying and numerous professional certifications, Sam has established himself as an authority in the field of damp diagnosis and remediation.

At Damp Surveyors Ltd, Sam applies his extensive knowledge to help homeowners across the UK address and solve their damp issues effectively. His approach combines cutting-edge techniques with a commitment to honest, client-focused service, ensuring that every survey and recommendation is tailored to the specific needs of the property.

As a thought leader, Sam’s insights into damp prevention and treatment have been featured in industry publications, underscoring his role as a trusted expert dedicated to maintaining the integrity and comfort of your home.

Testing device for measuring dampness in a house


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