Question about Haier HDN655E Dehumidifier

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Dehumidifier efficiency The compressor is running but there is very little drying. Can you tell me what temperature I should expect the coils to run at. They are not very cold so I suspect the machine has lost gas.

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  • martin_valen Feb 02, 2009

    We do have central heating!

    But yes I agree it will not work as well in the cold.

    My coil is not reaching anything like 40 degrees so I am happy that there is a lack of gas.

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I'm surprised that you are trying to dehumidify if you are in the northern hemisphere right now.

But, before you go off trying to fix the refrigerant, see if you can get a glass of ice water to sweat near the dehumidifier. While relative humidity might be high in cold climates right now, it's a relative number, as the total grains of moisture is far lower than what it would be in a warmer climate. Cold air saturates easier, because it holds less, moisture.

Most people use a humidifier in the winter because they want to saturate the air with water, which is better for the human body, and minimizes static electricity.

I can help you diagnose the dehumidifier if you want. The coil should only get to 40 degrees or so. But the sweating glass of water will tell you if there is enough moisture in the air for the dehumidifier to wring out.

Posted on Jan 30, 2009

  • Mark Egan Feb 02, 2009

    I am not certain the coil is supposed to reach 40 degrees. Let me look into it. It could be as high as 55-60 degrees.

    Did you try the glass of water sweating thing?

    One other way to determine if you need to dehumidify is to take a thermometer and put a wet cotton swab on the sensing end, then place in front of a fan for a few minutes. Read the temperature before the air moving past the cotton swab dries it out. This gives you the wet bulb temperature. Then, take the cotton swab off, and measure the temperature of the air again. This is the dry bulb temperature.

    Using a psychrometric chart or table, you can now read the relative humidity of the air.

    By the way, all the temperatures I have been giving are in degrees F, not C.

    Let me know what you come up with. If the unit is not very old, I would not suspect that is low on charge yet. And if it is, then it's probably new enough that it is still covered under warranty.


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