Dehumidifier Freezing Up Causes & Fixes

I recently faced an issue with my dehumidifier that took me by surprise – it was “why your dehumidifier freezing up!” I had no idea why this was happening and it left me scratching my head. After doing some research, I found out that there are a few key factors that can cause your dehumidifier to freeze up.

Why my dehumidifier freezes up answer is due to excessively low temperatures or a malfunctioning cooling system, hindering its ability to effectively remove moisture from the air.

Dehumidifier Freezing Up

In this blog post, I’ll be giving you the lowdown on why your dehumidifier may freeze up and how to prevent it from happening in the future.

dehumidifier freezing up

Some main cause about dehumidifier freezes up are as follow:

  • Increase of room temperature
  • Clogged filters
  • Replace the fan motor
  • Refrigerant leaks
  • Clean the coils
  • Airflow

Too cold environment:

One of the leading causes of your dehumidifier freezing up is an environment that is too cold. If the room temperature is below 65°F, it can cause the coils to freeze and stop your unit from working correctly. 

Too cold environment for dehumidifier

To prevent this, keep the thermostat set at a comfortable temperature or increase it slightly if needed. You should also ensure that there are no drafts or open windows in the area near your unit to avoid any additional cooling. Finally, ensure adequate airflow around your dehumidifier to help regulate its temperature.

Clogged filters:

Another common cause of a frozen dehumidifier is a clogged filter. Your unit may struggle to pull in air, which can cause it to freeze. You should check the filter and replace it if necessary to fix this problem.

Clogged filters of dehumidifier case ice

It’s essential to keep your filter clean vacuum or brush away any dust, pet hair, lint or debris accumulated on the filter. If your unit has no removable filter, check the manufacturer’s instructions for cleaning advice. You should also ensure your team is installed in an area with adequate ventilation so air can flow freely around it.

Replace the fan motor:

If your dehumidifier isn’t getting enough air because of a clogged filter or blocked vents, its fan motor could be at fault. If the fan blades are not spinning fast enough, it will cause your unit to freeze up.

Replace the fan motor of dehumidifier when it become freeze

To fix this problem, you should check the fan motor and see if it needs to be replaced.

If your fan motor is worn out or damaged, it’s best to call a qualified technician who can safely diagnose and replace the issue.

Refrigerant leaks:

Refrigerant leaks can also be a cause of dehumidifier freezing up. The refrigerant is the fluid that passes through the cooling coils, which absorb heat from the air and cools it down. If there is a leak in your system, it will not be able to keep up with the amount of humidity present in the atmosphere, resulting in the coils freezing.

dehumidifier become freeze when Refrigerant start leaks

This problem can be difficult to diagnose as it is not always immediately apparent when there is a refrigerant leak. Symptoms may include unusually warm output from your dehumidifier or high humidity levels due to ineffective cooling. If you suspect that this might be the case, it is best to call an experienced technician for professional help.

Clean the coils:

The coils in your dehumidifier collect and drain moisture from the air. If these become clogged with dust, dirt, lint or pet hair, it can restrict airflow and cause the unit to freeze. To prevent this from happening, you should regularly clean the coils using a brush or vacuum cleaner. As with any other cleaning process, unplug the unit before you start to avoid any risk of electric shock!

Clean the coils of dehumidifier if it cover with ice

Once done, spray compressed air onto the coils to remove any remaining buildup or debris. You should also check that all the vents around your unit are clear so air can circulate properly.


The condenser coils in an air conditioning system are much colder than the incoming air. When this warm air passes over these cold coils, moisture from the air will begin to condense on them just like when a cold glass of water ‘sweats’ on a hot day! Suppose the temperature of the incoming air is below 65°F. 

In that case, however, it won’t be able to warm up the coils enough, and they will slowly reach cooler temperatures until they eventually freeze over. Preventing your AC unit from freezing up can be as easy as ensuring your home stays at least 65°F or warmer.

Effects of Dehumidifier Freezing

Some main effect of dehumidifier freeing are as follow:

Reduce efficiency:

When your dehumidifier freezes up, it can significantly reduce its working efficiency. This happens because the cold temperatures caused by the ice buildup cause the coils inside to freeze, blocking the airflow and preventing them from properly absorbing moisture in the air. As a result, humidity levels become higher and your dehumidifier is unable to keep up. The result is a less efficient and less effective dehumidifier.

Indoor air quality issues:

It can cause a number of indoor air quality issues when your dehumidifier freezes up. As the air temperature in the home decreases, moisture levels can increase and cause increased humidity. This can lead to condensation on windows, walls, or furniture; musty odors; dampness in carpets and other fabrics; and health issues related to mold growth. High levels of humidity can cause dust mites and other allergens to thrive. All of these issues can make indoor air quality uncomfortable, unhealthy, and unappealing.

High energy cost:

It can be incredibly inefficient and costly in terms of energy consumption when your dehumidifier freezes up. The cold temperatures caused by the buildup of ice on the coils reduce their ability to absorb humidity from the air, meaning that your dehumidifier has to work harder and for longer to achieve the desired result. This extra effort requires more energy and can lead to higher electricity bills, as well as increased wear and tear on the components of your dehumidifier.

Risk of damage to the unit:

When your dehumidifier freezes up, it can put the entire unit at risk of damage. Ice buildup on the coils can lead to blockage, which prevents airflow and causes strain on the motor. This extra strain can cause components to malfunction or even break down, resulting in costly repairs or replacements. Water from melted ice could also leak into sensitive areas of your dehumidifier and damage its circuitry.

How to Prevent Dehumidifier Freezing

Preventing a dehumidifier from freezing is key to keeping your home humidity levels at the ideal level. To ensure your dehumidifier operates optimally, it’s important to keep an eye on the temperature and air flow around the unit.

Here are some tips for preventing your dehumidifier from freezing up:

Optimal operating temperatures:

Optimal operating temperatures are important for ensuring that your dehumidifier runs effectively and efficiently. When the temperature around the unit is too low, the water collected in it can freeze, resulting in potential damage to the system.

The best way to prevent your dehumidifier from ice buildup is to keep the surrounding air temperature between 65-75 degrees Fahrenheit. This range of temperatures allows the system to operate without reaching subzero levels where ice could form. Keeping a steady flow of air helps maintain optimal conditions and prevents ice buildup.

Proper placement of the unit:

Proper placement of the unit is essential for ensuring the dehumidifier can operate at its optimal temperature. When a dehumidifier is placed too close to a cold surface, such as an exterior wall or window, air circulation around the unit will be limited and the cold temperatures can cause it to freeze up.

Proper placement of the dehumidifier

The ideal place to keep your dehumidifier is on an interior wall away from any windows or drafts. This will provide additional insulation, allowing the surrounding air temperature to remain higher than if it was in direct contact with a colder surface outside. Try not to keep the unit against any walls where there are pipes that may be releasing cold air into the room.

Regular cleaning and maintenance:

Timely repairs and replacements the dehumidifier

Regular cleaning and maintenance are essential for keeping your dehumidifier running properly and preventing it from freezing and you also have to read its manual. Cleaning and maintaining the unit regularly will help keep the airflow unobstructed, so that warm air can continue to circulate around the dehumidifier. Regular cleaning will eliminate any dirt or dust buildup which could decrease the efficiency of the unit.

Cleaning and maintenance tips:

Tips for proper cleaning and maintenance of your dehumidifier:

  • Vacuum off the outside of the unit with a soft brush attachment to remove any dirt or debris.
  • Check that all filters are clean and free of debris or obstructions. Replace them if necessary.
  • Ensure that all vents are free of dust or other obstructions that could potentially decrease airflow.
  • Clean the condensate drain pan and hose to remove any buildup of dirt or debris, which can affect the performance of your dehumidifier.
  • Inspect all electrical components to ensure they are in good working order. If you find any issues, it is best to replace them as soon as possible.
  • Follow the manufacturer’s instructions for periodic maintenance such as lubricating moving parts or replacing filters.

By following these tips, you can help prevent your dehumidifier from freezing up and ensure optimal performance.

Timely repairs and replacements:

Timely repairs and replacements are important for preventing your dehumidifier from freezing. As the unit ages, certain components of the system can become worn out or damaged, resulting in decreased efficiency and increased chances of freezing up.

By replacing or repairing any faulty parts as soon as possible, you can ensure that your dehumidifier will continue to operate optimally and help keep it from freezing.

Here are some helpful tips for repairing and replacing your dehumidifier to prevent it from freezing:

  • Inspect the unit regularly for any signs of wear or damage.
  • Check all filters and make sure they’re free of dust and debris. Replace them if necessary.
  • Vacuum off the exterior of the unit with a soft brush attachment to remove dirt and prevent air blockages.
  • Clean out the condensate drain pan and hose to remove buildup which can obstruct airflow around the dehumidifier.
  • Ensure that all vents are clear of any obstructions that could reduce airflow.
  • Lubricate moving parts according to manufacturer’s instructions.
  • Replace electrical components if they are not working properly.
  • Follow manufacturer’s instructions for periodic maintenance and filter replacement.

By these tips, you can help keep your dehumidifier running smoothly and reduce the chances of it freezing up.

Use of a Humidistat:

A humidistat is a device that regulates the humidity level in your home or office. It monitors the relative humidity of the air and automatically adjusts it to keep it within a comfortable range.

This helps prevent your dehumidifier from freezing because when the air is too humid, condensation can form on cold surfaces such as ducts and other components of your dehumidifier, which can cause them to freeze up.


Using a humidistat with your dehumidifier ensures that you don’t have to constantly monitor the humidity levels manually. Instead, you can set it to maintain an optimal range of humidity so that you can be sure your dehumidifier won’t freeze up due to excess moisture in the air.


Why my Dehumidifier Freezes Up is crucial in maintaining its efficiency and longevity. By following the tips highlighted in this article, you can avoid the inconvenience and expenses associated with a frozen dehumidifier. Remember to prioritize proper maintenance practices such as regular cleaning, checking the temperature settings, and ensuring proper drainage to prevent this common issue. With these simple precautions, you can enjoy the benefits of your dehumidifier for longer and keep your home comfortable and healthy. So let’s take care of our dehumidifiers and keep them running smoothly!

Related F.A.Qs:

What causes a dehumidifier to freeze?

A dehumidifier can freeze up if too much moisture is in the air or the coils become too cold. When this happens, the coil will accumulate frost and eventually ice, preventing the unit from working correctly. This problem can be controlled by checking and adjusting the humidity settings on your dehumidifier and regularly cleaning and maintaining the team.

How much water should a dehumidifier collect in a day?

The amount of water that a dehumidifier can collect in a day depends on the size and type of model and the room’s humidity level. Generally speaking, petite models can collect up to 20 pints of water daily, while larger models can collect up to 70 pints or more.

Is it OK to leave a dehumidifier on overnight?

It is generally safe to leave a dehumidifier running overnight and for extended periods. However, you should ensure that your dehumidifier has an automatic shut-off feature in case the tank gets too full. It’s also important to regularly monitor and maintain your dehumidifier by emptying the water tank and cleaning the filter.

Should the dehumidifier run all day?

It is optional to run a dehumidifier all day. Many models have an adjustable humidity setting so that you can set it to the desired level, and it will turn off once that level has been reached. Generally, it is best to run the dehumidifier during high relative humidity, such as when showers are taken or when the humidity level is over 60%.

Does a dehumidifier use a lot of electricity?

A dehumidifier does use a considerable amount of energy to run, but the exact amount depends on the size and type of model. On average, a 70-pint capacity dehumidifier will use about 700 watts of electricity when running.

How long does it take for a dehumidifier to defrost?

Most dehumidifiers will have a built-in defrost cycle that kicks in when the coils become too cold. The time it takes for the dehumidifier to complete its defrost cycle depends on the model and size, but generally speaking, it can take anywhere from 10 minutes to an hour.

About The Author

Scroll to Top