Why Does My Dehumidifier Blow Hot Air?

Are you wondering why your dehumidifier is blowing air, especially hot air? Many people don’t know this, but part of the dehumidification process involves releasing some warm exhaust air into the room. Rest assured, this insightful guide will shed light on what’s causing the heat release, and provide practical solutions to mitigate it.

Get ready to discover secrets of your dehumidifier that ensure optimal function and a comfortable living space!

Key Takeaways

  • Dehumidifiers emit hot air as they remove excess moisture from the air, which helps improve indoor comfort, prevent mold, and eliminate odors.
  • Common causes of hot air emission from a dehumidifier include refrigerant leakslow levels of refrigerantdust blocking filters and coilshigh humidity levels, and a full water tank.
  • To resolve hot air emission issues, check the settings of your dehumidifier, regularly empty the water tank, give it breaks to cool down, clean the coils and filters regularly, choose the right size unit for your room, and seek professional help if needed.
  • Prevent hot air emission by practicing regular maintenance such as cleaning coils and filters frequently and placing the dehumidifier in a well-ventilated area away from heat sources. Additionally, manage humidity levels in your home with proper ventilation and keeping doors/windows closed during humid weather.

Why Does a Dehumidifier Blow Warm Air?

Your dehumidifier blows hot air because as the moist air passes through it, it is designed to expel warm air as part of the moisture removal process.

If you’re wondering about the efficiency of smaller units, you might want to check out are small dehumidifiers worth it?

Ideal temperature for dehumidifier air

The temperature of the air for a dehumidifier is key. It should be a bit warmer than the air that goes into it. This helps to take out moisture from your room’s air. The increase in heat can range from 5°F to 15°F.

A special type called a desiccant dehumidifier will blow air about 20°F hotter than the air in the room. These changes in temp are normal and help improve indoor comfort, mold prevention, and odor elimination.

Common causes of hot air emission

Hot air from the dehumidifier may be due to a few things. A leak in the system could cause too much heat output. This happens if the refrigerant leaks out. Without enough cooling substance, the unit gets hot instead of cold. If you’re using a smaller room, understanding how dehumidifiers work in small rooms can be beneficial.

Another issue is low levels of this cooling stuff, called “refrigerant”. If there’s not enough inside, your machine will again blow hot air. Additionally, dust can cause trouble by blocking up the filter and causing dirty coils.

When such blockages occur, airflow gets cut off and overheats your dehumidifier.

Humidity is also an enemy here. If the air around the dehumidifier is too humid, it has to work extra hard, which can make it produce hot air rather than cool it down as intended! One more reason for this heating problem – if you haven’t emptied its water tank or “reservoir”, fullness might make your dehumidifier emit hot air as well!

Lastly but importantly, any issues with the compressor overheating or poor working condition of its cooling system might lead to hot air emission from a dehumidifier as well.

We’ll now look at how you solve these problems!

How to Fix a Dehumidifier Blowing Excessively Hot Air

To resolve the issue of your dehumidifier blowing too hot air, there are several solutions you can try: checking and adjusting the settings, emptying the reservoir regularly, giving the dehumidifier a break to cool down, cleaning the coils and filters, ensuring you have the right sized dehumidifier for your room, and seeking professional help if needed.

Checking the settings

First, look at the settings when your dehumidifier starts blowing air. A wrong setting could make it blow out hot air. Find your user guide and learn about each setting. Make sure the machine is set up right.

It helps to solve issues with hot air coming from it. If the refrigerant or compressor isn’t working wellchecking this can tell you. So, always keep an eye on those settings!

Emptying the reservoir

Emptying the reservoir when your dehumidifier has been running is an important step in resolving hot air emissions. As moisture is collected from the air, it drips into a reservoir or tank. When this tank becomes full, it can cause the dehumidifier to blow out hot air instead of cool air. 

If you’re curious about the water collected, learn if water from a dehumidifier is distilled.

To fix this issue, regularly check and empty the reservoir to ensure proper functioning of your dehumidifier.

Giving the dehumidifier a break

During the hot summer months, to prevent your dehumidifier from emitting hotter air, it’s important to give it a break every now and then. Dehumidifiers work hard to remove moisture from the air, and this can cause them to generate heat.

By giving your dehumidifier some downtime, you allow its components to cool down and reduce the amount of hot air it releases. This can also help prolong the lifespan of your dehumidifier by reducing wear and tear on its internal parts.

So, when you don’t need to use the dehumidifier for an extended period of time or if the humidity levels in your room are already under control, consider turning it off or setting it at a lower fan speed to give it a well-deserved break.

Cleaning the coils and filters

To resolve hot air emission issues from your dehumidifier, one important step is to clean the coils and filters regularly. Over time, dust and debris can accumulate on the evaporator coils and clog the filters, making it harder for the dehumidifier to cool the air effectively.

This can result in the dehumidifier emitting hot air instead of cool air. By cleaning the coils and filters, you can improve the cooling efficiency of your dehumidifier and ensure that it removes moisture from the air more effectively.

Regular maintenance like this will help keep your dehumidifier working properly and maintain good indoor air quality.

Proper dehumidifier size for your room

Choosing the right size dehumidifier for your room is crucial for effective moisture removal. A proper dehumidifier size ensures that it can handle the humidity levels in your space without straining or underperforming.

If you choose a unit that’s too small, it won’t be able to remove enough moisture from the air. On the other hand, an oversized dehumidifier may cycle on and off frequently, resulting in excessive energy consumption and wear and tear on the equipment.

To determine the correct dehumidifier size for your room, consider factors such as the square footage of your space, humidity level, temperature, and any specific issues like water damage or mold growth.

Seeking professional help for faulty units

If you’ve tried all the solutions mentioned earlier and your dehumidifier is still blowing hot air, it’s important to seek professional help. Faulty units may require specialized knowledge to diagnose and fix the problem correctly.

A professional can assess the unit, identify any underlying issues, and provide the necessary repairs or replacements. Remember, addressing dehumidifier problems promptly ensures that your unit performs efficiently and effectively in managing humidity levels.

Don’t hesitate to reach out for expert assistance when dealing with faulty dehumidifier units.

Preventing Hot Air Coming From Your Dehumidifier

To prevent hot air emissions, especially during the hot summer months, regular maintenance of your dehumidifier is crucial. Ensure that you clean the coils and filters frequently to keep them free from dust and debris. Additionally, proper placement of the dehumidifier away from walls or furniture can improve airflow and prevent overheating.

Finally, managing humidity levels in your home with a well-functioning dehumidifier can help reduce the amount of hot air expelled into the room.

Regular maintenance

Regular maintenance is crucial for preventing your dehumidifier from blowing too hot air. By regularly maintaining and cleaning your dehumidifier, you can ensure that it operates efficiently and functions properly.

One important aspect of regular maintenance is cleaning the air filter of your dehumidifier. This helps to prevent dirt and debris from clogging the filter, which can lead to hot air blowing out of the unit.

In addition to cleaning the air filter, it’s also recommended to check for any refrigerant leaks or low levels of refrigerant during regular maintenance. Taking these steps will help keep your dehumidifier in good working condition and prevent hot air from being emitted.

Proper placement

To stop your dehumidifier from blowing hot air, especially when the air is cooled, it’s important to place it in the right spot. Make sure there is enough space around the dehumidifier for proper airflow. Avoid placing it near heat sources or in direct sunlight, as this can cause it to blow out hot air instead of cool air.

By finding a suitable location with good ventilation, you can ensure that your dehumidifier operates efficiently and effectively without blowing out hot air.

Managing humidity levels

To prevent hot air emissions, especially when the dehumidifier rejects heat, it is important to manage the humidity levels in your home. High humidity can make a room feel stuffy and warmer, so controlling the moisture in the air is essential. If your dehumidifier isn’t functioning as expected, it might be due to dehumidifier icing up, which can be another reason for hot air emission.

Regularly using your dehumidifier can help remove excess moisture and maintain a comfortable indoor environment. Additionally, proper ventilation and keeping doors and windows closed during humid weather can also help manage humidity levels effectively.

By doing these things, you can prevent hot air from being emitted by your dehumidifier and create a more pleasant environment in your home.


In conclusion, it is normal for a dehumidifier to blow out hot air because of the heat generated by the compressor. However, if your dehumidifier is emitting excessive hot air or not working properly, there are several solutions you can try.

These include checking the settingsemptying the reservoircleaning coils and filters, and seeking professional help if needed. Remember to regularly maintain your dehumidifier and manage humidity levels to prevent hot air emission.


1: How does an air conditioner work?

An air conditioner works by removing heat and moisture from the air in your home. It does this by passing warm air from your room over a cold evaporator coil, which cools and dehumidifies the air. Then, the conditioned air is blown back into the room, making the air feel cold.

2: What should I do if my air conditioner is blowing hot air?

If your air conditioner is blowing hot air, there could be several reasons for this. One common issue is a dirty air filter, which can restrict the airflow and cause the air to feel hot. Another possible cause could be a malfunctioning compressor or a hot condenser coil. It is recommended to make the air conditioner checked by a professional to diagnose and fix the problem.

3: Can a dehumidifier make the air in my room feel hotter?

No, a dehumidifier does not make the air in your room feel hotter. In fact, a dehumidifier draws moisture from the air and reduces the humidity level, making the air cooler and more comfortable. However, if the dehumidifier is blowing warm air, it could be due to a malfunction or an excessively hot environment. In such cases, it is advisable to have the dehumidifier checked by a professional.

4: How much hotter should the air coming out of the portable dehumidifier be compared to the room temperature?

The air coming out of a portable dehumidifier should be approximately 3-5°F warmer than the room air temperature. This is because the dehumidifier removes moisture from the air, and as a result, the air gets slightly heated during the dehumidification process.

5: Why is my dehumidifier blowing cold air?

If your dehumidifier is blowing cold air, it may not be functioning properly. A compressor dehumidifier typically uses a refrigeration system to remove moisture from the air, and if the refrigeration system is malfunctioning, it may cause the dehumidifier to blow cold air. It is recommended to have the dehumidifier inspected by a professional to determine the cause of the issue.

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