Whatis a Dehumidifier? A Detailed Guide

What Are the Common Types of Dehumidifiers?

Dehumidifiers are electrical appliances designed to reduce indoor humidity, thereby creating a healthier indoor environment. The key types of dehumidifiers are:

Refrigerant or Compressor Dehumidifiers

The refrigerant-based models are the most common dehumidifiers in the UK. A cold coil system is used in these dehumidifiers to extract moisture from the air by condensation. Their fan extracts humid air and moves it across cold coils to remove the moisture. Water vapour condenses into droplets when the air is cooled, which collect in a tank or outlet hose and are discharged via drainage. Afterwards, the dried air is reheated before being released back into the room. Compressor dehumidifiers are the best option for everyday home use.

Key Features:

• Durable units designed for lasting domestic use
• Low running costs and being highly energy efficient
• Ideal option for air temperatures above 15°C
• Fit for living rooms, bedrooms, and larger indoor areas

Desiccant Dehumidifiers

Rather than relying on refrigeration, a desiccant dehumidifier uses a chemical drying agent to absorb moisture from the air, thereby controlling humidity. These dehumidifiers use hygroscopic materials, such as silica gel-coated rotors, to remove water vapour from the air. A desiccant dehumidifier can work consistently at low temperatures. This ongoing performance makes them well-suited for garages, conservatories, boats, and other cool, moist settings.

Key Features:

• Very low noise levels
• Easy to move between rooms and lightweight
• Best for construction sites, storage spaces, and wine cellars

Whole-House Dehumidifiers

Whole-house dehumidifiers are integrated into a central heating and ventilation system. These units regulate humidity throughout the property. Like refrigerants, the components in this dehumidifier work in the same manner, just on a larger scale. A whole-house dehumidifier can control moisture levels across multiple rooms at once. They are the best choice for poor ventilation or a house with health concerns about mould. This humidifier type is useful for large homes and can be installed in lofts or basements.

Key Features:

• Lower strain on air conditioners, potentially lowering energy bills
• Capable of extracting significant amounts of water, e.g., 90+ pints per day
• Typically, requires only annual filter replacements or check-ups
• Designed to operate unobtrusively, often quieter than portable units

Mini or Portable Dehumidifiers

Mini or portable dehumidifiers are compact units designed for small or confined spaces. They absorb moisture from the air using thermoelectric (Peltier) technology. Due to their small size, they are highly convenient for travel or occasional use. Mini or portable dehumidifiers typically cover areas of 100 to 300 square feet.

Key Features:

• Generally, remove between 250ml and 1 litre of water per day
• Designed to consume very low electricity
• Have a dedicated setting to speed up drying laundry indoors
• Often include timer settings for controlled operation

Signs That You Need a Dehumidifier

When a dehumidifier is needed, there are many signs of excessive humidity in your home, including:

• Condensation on windows
• Musty or stale smells
• Damp or water marks on walls or ceilings
• Visible mildew or mould growth
• Stuffy indoor atmosphere
• Poor ventilation
• Warping or rotting wood
• Corrosion of metal pipes or equipment
• Excessive allergies

Using a dehumidifier can improve indoor air quality, lower excessive humidity, and enhance overall comfort.

How to Use a Dehumidifier?

Using a dehumidifier correctly ensures maximum efficiency and performance:

Step 1: Placement of the dehumidifier

The centre of the room, the best place to position a dehumidifier, ensures the air circulates properly around the unit. To maximise the unit's potential, place it near the moisture source if the space is large. When using a dehumidifier, close the windows and doors during operation and do not place it near furniture or walls.

Step 2: Select the Right Settings

After placing the dehumidifier, check the unit's settings by turning it on. The humidity level of your home should be between 30% and 50%. Using a hygrometer or a dehumidifier's LED screen, you can check the humidity level. If the dehumidifier has an automatic setting, set it to the highest level and let it adjust as the air dries.

Step 3: Drain the Water Tank and Clean the Filter

To prevent dust buildup, clean the dehumidifier filters every 6 months. A quick vacuum or wash with warm water and detergent keeps the filter in top condition. Be sure to regularly empty the water tank and keep the dehumidifier coils clean. You can use an air mover to maximise performance and speed up the dehumidifier's drying process.

What Size of Dehumidifier Should You Buy?

The number of dehumidifiers you need depends on your home's size. If you live in a large home, you would need a more powerful dehumidifier. The choice of a dehumidifier can also be based on the tasks you regularly do in your home. Most dehumidifiers can handle moisture from cooking and showering.
You may need a powerful unit if you:

• Dry laundry indoors frequently
• Have too many pets and plants
• Use paraffin heaters and portable gas bottles

All of the above increase humidity, and removing them requires a power unit. These household jobs and circumstances increase humidity, so they require a more powerful unit.

How To Choose the Right Dehumidifiers?

Before purchasing a dehumidifier, one must consider the following things:

Check Where It's Built

If you are in the UK, look for UK-manufactured dehumidifiers designed to suit the ever-changing climate. In Southern and Central Europe, where temperatures are hot and humidity is high, Chinese-manufactured dehumidifiers are often the best option.

Check Which Type It Is

Before buying dehumidifiers, determine which type you want. Dehumidifiers are designed for specific areas. If you live in a cold area, you would need a dehumidifier with a compressor. On the other hand, desiccant dehumidifiers are a strong option if you live in a hot climate.

Extraction Capacity

You need to ensure the unit matches the room size and moisture level. Underpowered units may struggle to reduce humidity effectively.

Check its Size

For the UK home, a dehumidifier with a capacity below 2 litres will not be sufficient. A dehumidifier with a capacity of more than 2 litres can extract too much water.

Check the Control System

A dehumidifier with a manual control system needs constant attention because the settings change multiple times a day. An automatic system adjusts itself by checking the air moisture level.

Check its Price

Dehumidifiers made with low-quality materials are excessively cheap and inefficient. They can break quickly and also increase your electricity bill in no time.

Noise Levels

If placing the unit in a bedroom or living area, consider quieter models.

Conclusion

A dehumidifier plays a significant role in enhancing indoor air quality and shielding your space from damp-related damage. By learning about the various types of dehumidifiers and how they work, you can easily eliminate excess moisture from your home.
A well-chosen dehumidifier offers lasting perks, from preventing condensation and mould growth to improving comfort and supporting respiratory health. Evaluate your environment thoroughly, choose the appropriate capacity, and ensure proper maintenance to maintain a dry, safe, and comfortable home all year round.