Why Is My Dehumidifier Blowing Hot Air? 6 Causes and Fixes

Perhaps you are wondering: Why is my dehumidifier blowing hot air?

Well, a dehumidifier blowing hot air is not bad. The only bad thing is when the dehumidifier blows very hot air and the room becomes unbearably hot.

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Since a dehumidifier removes moisture from the air, it is going to blow warm air back into the room. And that is fine. If the room becomes unbearable from dehumidifier hot air, it is time to check it out and make the right fixes.

So, why is hot air coming out of my dehumidifier?  When the dehumidifier removes the moisture from the air, the air passes over a reheating coil. Hence, you get hot air blowing back into the room. If the unit is not set to dehumidify, it will blow out hot air. If it is broken, or the tray is full, it will blow back hot air. If the dehumidifier blows very hot air into the room, it might be faulty.

If the dehumidifier blows hot air that heats the room to more than 90 degrees Fahrenheit, it is faulty. That is too much heat and it is above the optimum operating temperature.

On the other hand, if the dehumidifier blows air that lowers the temperature in the room to below 70 degrees Fahrenheit, that is too low and something must be wrong. You can refer to our article on what to do when a dehumidifier blows out cold air.

If you have a dehumidifier that does not generate heat, it might in reality be an air conditioner. Between the dehumidifier and the air conditioner, the former warms the air while the latter cools it.

5 Reasons for Dehumidifier Blowing Hot Air

A dehumidifier that does not produce heat is faulty. On the same note, a dehumidifier heating the room too much is also faulty.

The most important thing is to have a balance in the room. That way, the air wont be too cold or too hot and the humidity will be just right, at 30 to 55%.

Here are some reasons for your Frigidaire dehumidifier blowing hot air:

1. The dehumidifier is set to fan instead of dehumidify

Check the settings of your dehumidifier. If it is set to fan, it means that it is only blowing the same hot air in the room back into the room. That is why you are not feeling any change in the temperature.

A dehumidifier should remove excess moisture from the air in your home. At the same time, it should also make the air a bit cooler.

The solution – Just turn the dehumidifier on to dehumidify and it will soon rectify the situation.

2. The reservoir is full

Small dehumidifiers have a reservoir where the water that they draw from the air collects. Once the reservoir is full, the dehumidifier stops drawing moisture from the air. The unit keeps moving the air but since it does not remove humidity, the air remains hot instead of cooling down some.

The solution – Just empty the reservoir so that the dehumidifier can start removing moisture and cooling the indoor air again. You will be happy to know that you can use dehumidifier water on your plants.

3. The dehumidifier has been running too long

You should check the time that the manufacturer says a dehumidifier should run. If it has exceeded those hours, the dehumidifier compressor goes hot and it starts blowing hot air back into the room.

To know whether the dehumidifier has been running too long, touch it. If it is hot, you need to turn it off and give it some time to cool down.

The solution – To know whether the dehumidifier heats up room because it has been running too long, touch it. If it feels too hot, switch it off for sometime, until it cools down.

4. The coils are dirty

When your dehumidifier coils are too dirty, they could release too much heat into the room. Thus, you need to check them!

Think, when did you last clean the dehumidifier coils? If it has been some time, well, they could be the cause for the dehumidifier blowing hot air.

There is no problem with dehumidifiers blowing warm air, but if it is too hot, check the coils. You can check the user manual that came with the appliance to know how to clean them.

5. The dehumidifier is too small or too big for your room

It is very important that you buy the right size dehumidifier for your room. If it is too small, it will overwork and it will produce too much heat. If it is too big, it will dehumidify the air too much and it will still generate a lot of heat.

Image of dehumidifier hot air

Every dehumidifier has a space rating. For example, the 70-Pint Frigidaire dehumidifier can dehumidify up to 2000 square feet of space.

Make sure you know the total area that you want to dehumidify or humidify before buying your appliance.

6. The dehumidifier is faulty

You will experience too much dehumidifier hot air if it is faulty. You cannot tell how an electronic appliance is going to behave when it faulty.

Thus, check for loose parts, bolts and nuts and fix them. Also, check whether the filters need changing or cleaning.

A broken compressor can cause serious issues with the appliance. You need to check anything and everything.

Whatever can go wrong will go wrong – check all parts.


To the question of why is my dehumidifier blowing hot air, you have seen the answer. You have seen the five possible reasons for that.

Many people ask, does a dehumidifier heat a room? The answer is yes. It should. In fact, the right question to ask would be; how much heat does a dehumidifier produce?

If you have a Frigidaire dehumidifier blowing cold air, it is faulty. It is not supposed to do that! At the same time, if you have a dehumidifier blowing too hot air, it is faulty.

You might consider buying the hOmeLabs Energy Star Dehumidifier from amazon.com for your home’s basement and other dehumidifying needs.

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