[Causes and Solutions] Why Does My Dehumidifier Blow Hot Air?

If your dehumidifier is blowing hot air, you are not alone. This is a common problem with many dehumidifiers and the causes vary from machine to machine.

Luckily, there are solutions for this problem that will help keep your home or business cooler and more comfortable in the summer heat!

Why Is My Dehumidifier Blowing Hot Air?

In general, a dehumidifier blowing hot air is very normal as every electric appliance produces heat naturally while running. However, if the blowing air is extremely hot, you need to contact the manufacturer for further troubleshooting.

Some other possible causes of a dehumidifier blowing hot air are humid conditions or dirty coils.

When your home becomes excessively humid, the moisture in the air can cause condensation to form on the inside surfaces of windows and doors as well as appliances like refrigerators, dishwashers and clothes dryers.

This type of humidity is especially common in the summer months when homes are less air-tight than they were in the winter.

If your coils have become dirty or clogged with dust, lint and pet hair, this can also contribute to a dehumidifier blowing hot air. Dirt and debris on these coils slows down their ability to cool efficiently which leads to increased energy consumption and higher utility bills.

To address the issue of a dehumidifier blowing hot air, try these steps:

  • Clean your coils by using compressed air or a vacuum cleaner with an attachment nozzle to remove any dirt, pet hair and lint that may be stuck to them
  • Change the settings on your humidistat to a higher or lower humidity level that is more comfortable for you
  • Change your filter to the appropriate season and clean it regularly
  • Water down fabrics in your home like curtains, upholstery, clothes and bedding so they don't mold. This will also reduce static electricity which may be causing dust on your coils to stick
  • Move your dehumidifier away from heat sources like fireplaces, furnaces or other appliances that may be generating excess heat. This includes the walls of your home which can act as a "heat sink" and pull in hot air inside through openings around windows and doors
  • Install an exhaust fan to vent warm air out of your home
  • Consider installing a thermostat to control the temperature in your home and help keep it from becoming too humid. This will work best if you have an energy-efficient furnace or boiler that can be programmed with this type of device

Remember, there are solutions for this issue that can help you keep your home or business cooler and more comfortable in the summer heat. If none of these options is feasible, consider purchasing a more expensive dehumidifier model that will work better in humid conditions.

Final Verdict


If your dehumidifier is blowing hot air, there are a few things that you can do to resolve the issue.

Dirty coils may be causing this problem so try cleaning them with compressed air or vacuuming and then consider adjusting the humidity level on your humidistat if you have one installed in order to prevent moisture from building up.

You can also move the dehumidifier away from any heat sources, install an exhaust fan to vent hot air out of your home and consider installing a thermostat if you have one.

Finally, try purchasing a more expensive model that works better in humid conditions or operating with no filter at all.

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