Troubleshooting Guide: Dealing with a Dehumidifier Blowing Hot Air

Dehumidifier Blowing Hot Air

Experiencing your dehumidifier emitting hot air might seem peculiar, but it’s a normal aspect of the dehumidification process. However, if you suspect an issue, this guide will help you understand why your dehumidifier is blowing hot air and how to address it effectively.

Understanding the Causes:

1. Clogged Air Filter:
– Issue: A clogged air filter can reduce airflow, leading to hot air emission.
– Solution: Regularly clean or replace the air filter to ensure proper airflow.

2. Dirty Evaporator Coil:
– Issue: A dirty evaporator coil can hinder efficient operation, resulting in hotter air.
– Solution: Disassemble the unit, access the coil, and clean it using a coil cleaning spray.

3. Defrosting Requirement:
– Issue: Freezing in the dehumidifier may lead to hot air emission.
– Solution: Set the dehumidifier to fan-only mode for defrosting, allowing the coil to thaw.

4. Normal Operation of Compressor Dehumidifiers:
– Issue: Compressor dehumidifiers inherently emit slightly warmer air during regular operation.
– Solution: Recognize that this is typical for compressor dehumidifiers and not necessarily a problem.

5. High Room Temperature:
– Issue: Excessively warm room air can result in the dehumidifier blowing hot air.
– Solution: Consider using an air conditioner during hot summer months for dehumidification.

6. Compressor Malfunction:
– Issue: A malfunctioning compressor or refrigerant imbalance can lead to hot air emission.
– Solution: Consult an HVAC professional for inspection and potential replacement.

Repair Steps:

1. Filter Replacement:
– Replace flat filters every three months to ensure optimal airflow.

2. Evaporator Coil Cleaning:
– Disassemble the unit, access the evaporator coil, and clean it using a coil cleaning spray.

3. Defrosting:
– Set the dehumidifier to fan-only mode to defrost and thaw the coil.

4. Normal Compressor Operation:
– Understand that compressor dehumidifiers produce slightly warmer air during regular use.

5. Room Temperature Control:
– Use an air conditioner during hot months for dehumidification without heating the air excessively.

6. Compressor Inspection:
– Consult an HVAC professional if you suspect a compressor malfunction or refrigerant imbalance.

Ideal Temperature for Air Emission:

– The air leaving a compressor dehumidifier is typically 3-5°F warmer than the room temperature.

Conclusion Dehumidifier Blowing Hot Air

– By following these steps, you can diagnose and address the issues causing your dehumidifier to blow hot air. If problems persist, seeking assistance from an HVAC professional is recommended.

FAQs Dehumidifier Blowing Hot Air

1. Should a humidifier blow hot air?
– Warm or hot air emission from a dehumidifier is normal, signifying the unit’s dehumidification process.

2. Is it normal for a dehumidifier to produce heat?
– Yes, a dehumidifier produces heat as a byproduct of removing moisture from the air.

3. How can I determine if my dehumidifier is working correctly?
– Check for airflow by placing your hand above the unit. Mildly warm to warm air emission during dehumidification is normal.

4. Why does my dehumidifier generate heat?
– Heat is generated as the dehumidifier cools and dehumidifies air before reheating it slightly above room temperature.

5. How can I stop my dehumidifier from blowing hot air?
– Regularly clean or replace the air filter, ensure the evaporator coil is clean, and consider using an air conditioner during hot weather. If issues persist, consult an HVAC professional.

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About the author


I am Ben , a seasoned HVAC specialist with over 6 of experience in the HVAC industry. I holds HVAC Certification and has a proven track record in providing expert advice on HVAC systems.