Why Does My Dehumidifier Blow Hot Air? (Fully Explained!)

A dehumidifier is suppose to blow out hot air because a reheating coil heats the water up.


If it's blowing out extremely hot air that could burn you, you have a very real problem.

You also have a problem if it's blowing out cold air.

Why Does My Dehumidifier Blow Hot Air

In this article you'll learn why the dehumidifiers blows out hot air and how to fix your dehumidifier if the air is too hot.

Why Does Your DeHumidifier Create Hot Air?

A dehumidifier creates hot air because it passes through a reheating coil before it's released into the house.

If your dehumidifier is putting out cool air, it means it's faulty! A dehumidifier removes hot air due to its dehumidifying process.

When moist air enters a dehumidifier, it goes through a condensation process. 

The refrigerant causes the moist air too condense, releasing the little water particles into a collecting bucket.

The cool air is further heated by the compressor and released back to the room. 

Are dehumidifiers suppose to blow hot air

Are Dehumidifiers Supposed To Blow Out Hot Air?

It's normal for dehumidifiers to blow out hot air. After dehumidification, the air released into the atmosphere is dry and at a higher temperature.

If you place a unit in a smaller room, the heat will be more notable than when placed in a larger one.

Read Also: The Best Place To Put Your Dehumidifier In A 2 Story House

This happens because the heat transfer is faster in a smaller area, compared to a larger one.

What You Should Do If Your DeHumidifier Is Producing Too Much Heat?

If your dehumidifier is producing too much heat, you can read the owner's manual to figure things out. You can also check out these options below.

Check For Weird Sounds

Most dehumidifiers are designed to operate with little or no sound. Changes in the sound can signify the presence of a fault.

Noisy sounds can be due to faulty compressors, loose fan motor mounting screws, etc. For instance, the compressor has a thermostat that regulates its temperature.

When the heat increases, it automatically stops the compressor.

But, if the thermostat is faulty, the compressor keeps working under pressure and keeps releasing hot air with creaky sounds.

What you can do:

  1. 1
    Check out for loose screws and tighten them.
  2. 2
    Call a maintenance specialist.

Check The Cooling And The Reheat Coils

If your dehumidifier has been working for a long time, there's a high chance that the coils are dirty.

Dirt can cause them to work under stress, causing the coils to release too much heat.

What you can do:

  1. 1
    Check out the steps outlined in the manufacturer's manual on how to clean the coils.
  2. 2
    If you don't have a manual, clean the coils gently with a brush and water.
  3. 3
    You can also use a vacuum cleaner to wipe out the dirt particles. 

Read More: Best 95 Pint Dehumidifier 

In other cases, the coils might not be working when the dehumidifier is powered on. If this is the case, you need to get a new dehumidifier.

Wrong Humidity Settings

For every room size, there is an ideal humidity setting. Like other electronics, dehumidifiers emit heat when they're powered on.

If placed in a small-sized room, the dehumidifier can absorb too much moisture. Then, making the air too uncomfortable.

A small-sized dehumidifier in a large room can cause it to work under pressure. And this can cause it to release too much heat.

Or, if your humidistat is set too low, the unit can release too hot air. 

What you can do:

  1. 1
    Buy the right dehumidifier for your room. Also, confirm the right humidity setting for your room size before making a purchase. Generally, your humidistats should be set between the range of 30%-50% RH (Relative Humidity). You can reduce the humidity rate if you're still not comfortable. 
Defrost setting for dehumidfiers

Defrost Settings Are Malfunctioning

The condenser has an automatic defrost system. The defrost system helps to remove clogged frost from the condenser.

A faulty defrost system can cause the condenser to work under mechanical stress.

Because of this, the dehumidifier can produce too much heat. If prolonged, it can destroy the whole unit.

What you can do:

  1. 1
    Not all dehumidifiers come with a defrost system. If yours does, check out the defrost system. You can call a maintenance specialist to change the defrost system.
  2. 2
    Buy a new dehumidifier. 

Other Causes

The dehumidifier can blow too much heat because of an overworked compressor.

When this happens, it won't be long before the dehumidifier stops working. 

It could be an electrical issue. The capacitors might be burnt, which can cause an electric short circuit.

Read Also: The Best Dehumidifiers For Your Closet

When this happens, you begin to hear clicking sounds from your dehumidifier. The motor will seize up in no time if it prolongs.

This explains why your dehumidifier is blowing too hot air, even though it has a refrigerant. Place your hands on the control boards. If you feel more heat than normal, call a technician to check it out.  

Lastly, repeatedly flicking the power switch can cause the compressor to heat up.

When this happens, your dehumidifier starts to release too much hot air. Turn it off for 10 minutes before powering it on again.

Is Your Dehumidifier Not Getting Good Enough Air Flow?

Dehumidifiers can release too much hot air when placed in areas of insufficient airflow.

They are designed to work in areas with good airflow.

Poor airflow can cause the dehumidifier to work harder, leading to overheating.

What you can do:

  1. 1
    Place the dehumidifier in the center of your room. Remove objects that can block constant airflow.
  2. 2
    If the hot air persists, then it can mean a mechanical problem. Call an expert to service the dehumidifier. 

How Much Moisture Should My Dehumidifier Be Pulling In?

There's no perfect answer for the amount of moisture absorbed by a dehumidifier. It depends on several factors.

  • Temperature: If your home's temperature is very low, it signifies high air moisture. And this increases the rate at which the dehumidifier draws moisture from the air.
  • Capacity: The capacity of your dehumidifier affects how much air moisture it can absorb. For instance, a 14pt capacity will be ideal for a 1000 square feet moderately damp room.
  • Humidity: The higher the humidity, the more the dehumidifier draws in most air. If your dehumidifier comes with a humidistat, you can determine how much moisture you want it to absorb. The dehumidifier stops working once it reaches your set rate. 

Is Your Dehumidifier Hot?

If your dehumidifier is very hot, it might be the heat source in your room. For instance, a faulty fan motor can be the cause.

Read Also: Top Garage Dehumidifiers

Place your hand on the fan motor. It's usually warm, around 70 degrees Fahrenheit. If It's very hot, it means it's bad. 

What you can do:

  1. 1
    Check the owner's manual for solutions.
  2. 2
    Call an expert to check it out.
  3. 3
    Replace the fan motor.

If your dehumidifier shows error codes while running, it means it has a mechanical problem.

And this can cause it to overheat. Refer to your manufacturer's manual for their meaning.

Or you can check the internet.

For instance, EC means Defrost Sensor Error.

What you can do: 

  1. 1
    Unplug the dehumidifier for 15 minutes.
  2. 2
    If the issue continues, call an expert.

What Temperature Should The Air Be Coming Out Of A Dehumidifier?

The air temperature coming out of a dehumidifier should be at least 50 to  59 degrees Fahrenheit higher than the initial air. 

Like I said earlier, the air passes through the heating coils before it's ejected from the dehumidifier.

The heating coils warm the air slightly before releasing it into the atmosphere. 

Conclusion: Why Does My Dehumidifier Blow Hot Air?

If your dehumidifier is blowing hot air, do not worry.

It's normal!

But if it is blowing too much hot air, use the owner's manual to figure things out.

You can also call an expert to have your dehumidifier serviced. Or, buy a new dehumidifier to replace the broken one. 

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