Why Is My Dehumidifier Blowing Hot Air and What to Do About It: An Informative Guide

Why Is My Dehumidifier Blowing Hot Air?

A dehumidifier may blow hot air due to low refrigerant levels, a dirty air filter, frozen evaporator coils, or a malfunctioning compressor or fan.

Regularly cleaning or replacing the air filter, thawing the coils, and performing basic functionality tests can help resolve these issues.

If there is a refrigerant leak, it is important to turn off the dehumidifier, unplug it, and call an HVAC technician.

Proper maintenance, troubleshooting, and keeping the dehumidifier in an appropriate setting can prevent hot air blowing in the future.

Ducting the dehumidifier or using a whole-house dehumidifier may also address heat concerns.

Key Points:

  • Dehumidifier may blow hot air due to low refrigerant levels, dirty air filter, frozen evaporator coils, or malfunctioning compressor or fan.
  • Regular cleaning or replacing of air filter, thawing of coils, and performing basic functionality tests can help resolve these issues.
  • If there is a refrigerant leak, turn off dehumidifier, unplug it, and call an HVAC technician.
  • Proper maintenance, troubleshooting, and appropriate setting can prevent hot air blowing in the future.
  • Ducting the dehumidifier or using a whole-house dehumidifier may address heat concerns.

Did You Know?

1. Some dehumidifiers have a built-in defrost feature that causes them to blow hot air. This is to melt any ice that may have accumulated on the evaporator coils, allowing the dehumidifier to continue removing humidity from the air effectively.

2. The heat generated from a dehumidifier blowing hot air can actually be used as a source of additional warmth during colder months. By redirecting the hot air flow towards a room or space that needs heating, you can save on energy consumption and even reduce heating costs.

3. Certain dehumidifiers may intermittently blow hot air when operating in a low humidity environment. This is because the humidity sensor in the unit detects that the air is already dry, and as a result, the dehumidifier switches to a defrost mode to prevent the coils from freezing.

4. If your dehumidifier is blowing hot air continuously and excessively, it could indicate a problem with the internal temperature and humidity sensors. This issue could affect the overall functionality of the dehumidifier, so it is recommended to either seek professional assistance or consider replacing the unit.

5. In some cases, a dehumidifier blowing hot air can be caused by a clogged air filter. When the filter becomes dirty or blocked, it restricts the airflow, making the internal components work harder, resulting in the production of hot air. Regularly cleaning or replacing the air filter can help alleviate this issue and ensure optimal performance of the dehumidifier.

Types Of Dehumidifiers: Refrigerant-Based And Desiccant-Based

Dehumidifiers play a vital role in maintaining a healthy and comfortable environment by reducing moisture in the air. There are two common types of dehumidifiers: refrigerant-based and desiccant-based. Understanding the differences between these two types can help in troubleshooting the issue of hot air blowing from the dehumidifier.

  • Refrigerant-based dehumidifiers work by pulling in air and passing it over refrigerant coils. As the air cools, the moisture in the air condenses on the coils, forming droplets of water. This water is then collected or drained away, effectively reducing the humidity in the room.
  • Desiccant-based dehumidifiers use a moisture-absorbing material, such as silica gel or activated carbon, to pull moisture out of the air.

In summary:

  • Refrigerant-based dehumidifiers cool the air to condense moisture and collect or drain away the water.
  • Desiccant-based dehumidifiers use moisture-absorbing material to extract moisture from the air.

Overall, both types of dehumidifiers serve the same purpose of reducing humidity, but they accomplish it through different mechanisms.

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Causes Of Hot Air Blowing From Dehumidifiers

One of the common causes of hot air blowing from a dehumidifier is low refrigerant levels. This can occur due to a leak in the refrigerant system. When the refrigerant levels are low, the dehumidifier may struggle to cool the air effectively, leading to the blowing of hot air instead of cool, dry air. In such cases, it is important to turn off the dehumidifier, unplug it, and seek the assistance of an HVAC technician to identify and fix the refrigerant leak.

Another cause of hot air blowing is a dirty air filter. The air filter in a dehumidifier plays a crucial role in trapping dust, debris, and other particles from entering the unit. Over time, these particles can accumulate and block the airflow, causing the dehumidifier to overheat and blow hot air. Cleaning or replacing the air filter regularly is essential to prevent this issue.

To summarize, the two common causes of hot air blowing from a dehumidifier are low refrigerant levels and a dirty air filter. Keeping the dehumidifier in optimal working condition involves monitoring the refrigerant levels and ensuring the air filter is clean and free from blockages.

  • Turn off and unplug the dehumidifier if hot air is blowing instead of cool air.
  • Seek the assistance of an HVAC technician to identify and fix refrigerant leaks.
  • Clean or replace the air filter regularly to maintain proper airflow.

Importance Of Cleaning Or Replacing The Air Filter

Cleaning or replacing the air filter of a dehumidifier is a simple yet crucial maintenance task. A dirty air filter not only obstructs the airflow, but it also reduces the efficiency of the dehumidifier. As mentioned earlier, a blocked air filter can cause the dehumidifier to overheat and blow hot air. By cleaning or replacing the air filter regularly, preferably every few months, you can ensure proper airflow, improve energy efficiency, and extend the lifespan of your dehumidifier.

  • Regularly clean or replace the air filter of your dehumidifier every few months.
  • A dirty air filter obstructs airflow and reduces the efficiency of the dehumidifier.
  • Blocked air filters can cause the dehumidifier to overheat and blow hot air.
  • Cleaning or replacing the air filter helps ensure proper airflow, improve energy efficiency, and extend the lifespan of your dehumidifier.
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Steps To Take For A Refrigerant Leak

If you suspect a refrigerant leak in your dehumidifier, it is important to take immediate action to prevent further damage and ensure your safety.

Here are the steps you should follow:

  1. Turn off the dehumidifier and unplug it from the power source.
  2. Inspect the unit for any oily spots or stains, as these can be indications of a refrigerant leak.
  3. If you notice any such signs, it is best to contact an HVAC technician who can diagnose and fix the issue professionally.
  4. Attempting to repair a refrigerant leak without proper expertise can be hazardous and may void the warranty of the dehumidifier.

Remember, ensuring the proper functioning of your dehumidifier is essential for maintaining a comfortable and healthy indoor environment.

  • Turn off the dehumidifier and unplug it from the power source.
  • Inspect the unit for oily spots or stains.
  • Contact an HVAC technician for professional assistance.
  • Do not attempt to repair the leak yourself to avoid hazards and voiding the warranty.

“Attempting to repair a refrigerant leak without proper expertise can be hazardous and may void the warranty of the dehumidifier.”

Frozen Evaporator Coils: Causes And Solutions

Another possible cause of hot air blowing from a dehumidifier is frozen evaporator coils. This can happen when the airflow over the coils is restricted, causing the coils to become too cold and freeze. When the coils freeze, the dehumidifier may stop extracting moisture from the air efficiently, resulting in the blowing of hot air.

To address this issue, follow these steps:

  1. Turn off and unplug the dehumidifier.
  2. Allow the coils to thaw naturally. It is crucial not to force the thawing process by using external heat sources as this can damage the coils.
  3. Once the coils have thawed completely, restart the dehumidifier.
  4. Monitor its performance to ensure it is extracting moisture properly.

Note: Remember not to force thaw the coils with external heat sources to avoid coil damage.

Troubleshooting And Maintenance Tips For Dehumidifiers

To ensure the optimal performance and longevity of your dehumidifier, regular maintenance and troubleshooting are essential. Here are some key tips:

  • Clean or replace the air filter regularly to maintain proper airflow and prevent overheating.
  • Keep the dehumidifier in a space with a temperature above 60°F to prevent freezing of the evaporator coils.
  • Check for any signs of refrigerant leakage, such as oily spots or stains. If detected, seek professional assistance.
  • Perform basic tests to assess the functionality of the compressor and fan. If you suspect a malfunction, it is best to seek professional help.
  • Consider professional maintenance at least once a year to ensure peak performance and extend the lifespan of the dehumidifier.
  • Ducting the dehumidifier to an adjoining room or using a whole-house dehumidifier attached to the HVAC system can help address heat concerns in smaller rooms.
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By following these troubleshooting and maintenance tips, you can prevent hot air blowing from your dehumidifier and enjoy a comfortable and moisture-free environment. Remember, if you are unsure or uncomfortable with performing any tests, it is always best to seek professional help to avoid any potential risks or damages to your dehumidifier.


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Frequently Asked Questions

How do I stop my dehumidifier from blowing hot air?

One way to stop your dehumidifier from blowing hot air is by regularly cleaning or replacing the air filter. A clogged filter restricts airflow and can cause the device to work harder, resulting in the release of hot air. It is crucial to consult the dehumidifier’s manual for the manufacturer’s suggested maintenance schedule and follow it diligently to prevent this problem.

Do dehumidifiers make the air hot?

Yes, dehumidifiers do generate a slight amount of heat while they are in operation. However, this heat is generally unnoticed by most users due to a couple of factors. Firstly, the increase in temperature is minimal, which means it does not significantly affect the overall room temperature. Secondly, dehumidifiers actually enhance comfort by removing excess moisture from the air, thereby giving the perception of cooler and more pleasant indoor conditions.

Should a dehumidifier give off heat?

Yes, a dehumidifier should give off heat as it operates. Similar to other household appliances that generate heat during operation, dehumidifiers produce a small amount of heat while running their compressor. However, this heat is typically minimal and not easily noticeable. In addition to the small amount of heat produced by the compressor, dehumidifiers also blow out hot air as part of the moisture removal process. This hot air is expelled to aid in the efficient removal of moisture from the surrounding environment.

Why doesn’t a dehumidifier cool the air?

Dehumidifiers are not designed to cool the air because their primary focus is on extracting moisture rather than adjusting the temperature. While air conditioning units work by actively cooling the air and distributing it into a room, dehumidifiers solely target the humidity levels. By removing moisture from the air, dehumidifiers help create a more comfortable environment by reducing the stickiness or dampness in the room. However, they do not have the capability to generate cold air as air conditioning units do to lower the overall temperature.

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