Energy and running costs

Understanding Dehumidifier Running Costs in the UK

Learn how to manage dehumidifier costs while keeping your home comfortable and damp-free.

Updated 31 March 2026 Fresh Dry guide for UK homes

Dehumidifiers are becoming increasingly popular in UK households, especially for families dealing with dampness and humidity in their homes. However, many myths surround the running costs of these devices, particularly regarding their impact on energy bills. This article aims to clarify these misconceptions and provide practical advice on how to keep your dehumidifier running costs manageable.

By understanding the true costs associated with dehumidifiers, you can make informed decisions that keep your home comfortable without breaking the bank.

Myth 1: Dehumidifiers Are Extremely Expensive to Run

One common myth is that running a dehumidifier will significantly increase your energy bills. While it’s true that these devices consume electricity, the actual cost can vary greatly depending on several factors.

Here are key points to consider:

  • The average dehumidifier uses between 300 and 600 watts per hour.
  • If you run your dehumidifier for 8 hours a day at an average cost of £0.34 per kWh, your daily cost can range from £0.81 to £1.63.
  • This translates to about £24.30 to £48.90 per month, which is often less than the cost of serious damp repairs.

In conclusion, while dehumidifiers do use energy, the costs are often manageable, especially when weighed against the benefits of preventing damp-related issues.

Myth 2: You Need to Run a Dehumidifier 24/7

Another misconception is that dehumidifiers must be run continuously to be effective. This is simply not true, and in fact, running them non-stop can lead to unnecessary energy consumption.

To optimise usage:

  • Run your dehumidifier in the most humid areas of your home, such as basements or laundry rooms.
  • Use a hygrometer to monitor humidity levels; ideally, indoor humidity should be between 30-50%.
  • Consider using a timer or humidity sensor to automate operation, ensuring it runs only when needed.

By adopting these practices, you can effectively manage humidity without incurring excessive costs.

Myth 3: All Dehumidifiers Are the Same in Terms of Efficiency

Not all dehumidifiers are created equal, and assuming they all have the same running costs can lead to poor purchasing decisions. Different types of dehumidifiers have varying energy efficiencies.

Here’s a breakdown:

  • Desiccant Dehumidifiers: These are generally quieter and use less energy at lower temperatures but may have higher running costs due to the way they operate.
  • Compressor Dehumidifiers: These are more energy-efficient in warm conditions but can consume more power in cooler spaces.
  • Thermal Mass Dehumidifiers: These are more energy-efficient and cost-effective over time, especially for larger spaces.

Choose a model based on your home’s specific conditions and needs to ensure efficiency and cost-effectiveness.

Myth 4: Dehumidifiers Only Work in Summer

Many believe that dehumidifiers are only useful during the warmer months. However, this is not the case. Humidity can be a problem year-round, and dehumidifiers can be beneficial even in cooler seasons.

Consider the following:

  • Winter months can lead to condensation on windows and walls due to heating, making dehumidifiers crucial for maintaining air quality.
  • Using a dehumidifier in winter can reduce the risk of mould growth caused by humidity trapped indoors.
  • Utilising your dehumidifier year-round can lead to a healthier home environment.

In summary, don’t limit your use of a dehumidifier to just summer; it can be a valuable tool throughout the year.

Myth 5: Running a Dehumidifier Will Completely Eliminate Dampness

While dehumidifiers are excellent for reducing humidity levels, they are not a cure-all for damp problems. Many families expect that simply running a dehumidifier will solve their damp issues entirely, but this is a misunderstanding of how dampness works.

Here are some effective strategies to tackle dampness:

  • Identify and repair sources of moisture, such as leaks or poor ventilation.
  • Ensure your home is well-ventilated, especially in moisture-prone areas like kitchens and bathrooms.
  • Combine the use of a dehumidifier with other methods, such as using exhaust fans and keeping windows open when possible.

By understanding that a dehumidifier is part of a broader damp management strategy, you can effectively reduce humidity and prevent further issues.

Frequently asked questions

How much electricity does a dehumidifier use?

The electricity consumption of a dehumidifier typically ranges from 300 to 600 watts per hour, depending on the model and settings.

What is the ideal humidity level for a home?

The ideal indoor humidity level is between 30-50%. Keeping humidity within this range can help prevent mould growth and improve air quality.

Can I leave my dehumidifier running overnight?

Yes, you can leave a dehumidifier running overnight, especially if it has a built-in humidistat or timer to prevent excessive energy use.

Do I need to clean my dehumidifier regularly?

Yes, regular cleaning of the filter and water reservoir is necessary to maintain efficiency and prolong the lifespan of your dehumidifier.

Are there any alternatives to using a dehumidifier?

Yes, alternatives include improving ventilation, using exhaust fans in bathrooms and kitchens, and employing moisture absorbers like silica gel or calcium chloride.