Will a Dehumidifier Kill Mold?

Mold is a common household problem that can cause a variety of health issues, from allergies to more severe respiratory problems. Many people wonder if using a dehumidifier can help kill mold. 

The short answer is no; a dehumidifier alone cannot kill mold. However, it can be an effective part of a comprehensive mold removal strategy. 

This article will delve into the science behind mold growth, how dehumidifiers work, and how they can be used in conjunction with other methods to combat mold.

Dehumidifiers do more than just help control mold; they also offer significant health benefits. High indoor humidity levels can lead to an increase in dust, mold, pet dander, and other allergens, which can trigger allergic reactions like stuffy nose, itchy eyes, sneezing, or skin rashes.


How Does Mold Grow?

Mold spores are everywhere, but they need specific conditions to grow. These conditions include moisture, warmth, and a food source like wood, paper, or fabric. 

When these conditions are met, mold can grow rapidly, causing both structural damage and health issues.

Dehumidifiers’ Role

A dehumidifier works by pulling air into the unit and removing moisture from it. The dry air is then released back into the room, reducing the overall humidity level. Lower humidity levels make it more difficult for mold to grow but do not kill existing mold.

Mold is a living organism that requires moisture to grow but can survive in dry conditions by becoming dormant. A dehumidifier can make the environment less hospitable for mold growth but cannot eliminate mold spores or kill existing mold colonies.

Flickr Image by HS You

Dehumidifiers do more than just help control mold; they also offer significant health benefits. High indoor humidity levels can lead to an increase in dust, mold, pet dander, and other allergens, which can trigger allergic reactions like stuffy nose, itchy eyes, sneezing, or skin rashes. 

By maintaining a relative humidity level between 30 and 60%, dehumidifiers help reduce these indoor pollutants, thereby improving the overall air quality in your home. 

Using Dehumidifiers Effectively

  1. Find the Source of Water or Moisture: Before using a dehumidifier, identify the source of moisture that is allowing mold to grow. This could be a leaky pipe, poor ventilation, or high humidity.
  2. Choose the Right Dehumidifier: Dehumidifiers come in various sizes and capacities. Choose one that is appropriate for the size of the area you need to dehumidify.
  3. Regular Maintenance: Empty the water collection tray regularly and clean the air filters to ensure the dehumidifier works effectively.
  4. Monitor Humidity Levels: Use a hygrometer to monitor humidity levels and adjust the dehumidifier settings as needed.

Alternative Methods for Mold Removal

  1. Chemical Treatments: Products like bleach or specialized mold removers can kill mold but may also harm surfaces and are toxic to humans and pets.
  2. Natural Remedies: Vinegar, tea tree oil, and baking soda are less toxic alternatives that can kill some types of mold.
  3. Professional Help: For severe mold problems, it may be necessary to consult professionals for safe and effective removal.


While a dehumidifier alone cannot kill mold, it can be a valuable tool in a comprehensive mold control strategy. By reducing humidity levels, a dehumidifier makes it more difficult for mold to grow. 

However, it’s important to address the root cause of the moisture that allows mold to thrive. Combining a dehumidifier with other mold removal methods, such as chemical treatments or natural remedies, can provide a more effective solution.

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"Out of all of the options in the area, I’m so glad I went with Mold Solutions. They were the only ones that can thoroughly handle my entire problem, including the air conditioning ducts where other companies were telling me I needed 3 to 4 different service people with different bills all coming to my house at different times costing me tons of money. They got everything done in one day. I felt the difference in my health immediately after they finished." — 5-Star Google Review
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I'll start by saying Alisha from the word go was fantastic and brandon when he came out put me at ease. See I got taken by another company for thousands of dollars .The team hats off to you Devin, Heather,Monica thank you for doing such a caring job and giving us back are home in a condition we could be safe in and start the build back process. Devin and Alisha thank you for responding to every question we had . I will recommend you to whomever has to go through this type of horrible experience. You guys handled it with compassion and integrity and that in itself is a dieing trait So many thanks to you all....
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Mold solutions just remediated mold in my air handler and ductwork throughout my home. They were very thorough. I was impressed with their knowledge of mycotoxins from mold and the seriousness of mold. All of the staff that I interacted with was patient, friendly, helpful and efficient. They kept me informed and I was super happy that the entire home was dry fogged with pet friendly ingredients. My two cats and I had to go out on the patio for 3 hours as the dry fog did it's thing. They kept me informed and let me know when it was perfectly safe to go back inside. Trustworthy, efficient and nice.

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