Question about Frigidaire Dehumidifiers

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Relative humidity setting changes

I just installed a new Frigidare Dehumidifier. I set it for 35% relative humidity. After a fe minutes, the indicator changes to 65% relatively humidity. Why doesn't it stay at what I set it for?

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  • kenkhumophre May 13, 2009

    You may be right but the ambient humidity according to the weather bureau is now about 45%. I would think that it would not be that much higher indoors.

  • kenkhumophre May 13, 2009

    It turns out to be as with the last comment. The Rh in the room is displayed until the RH drops to the set point. The owner's manual is worthless on this and many other points.


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My guess is the unit knows it can't reach 35% humidity, bacause it's measuring the ambient humidity. Dehumidifiers usually can't drop the RH more than around 10%.

My guess is the RH in the room is around 75% when this happens.

Posted on May 13, 2009

  • 1 more comment 
  • Samuel Charles Spriggs May 13, 2009

    In and out RH can be vastly different -- in addition weather stations report humidity measured at locations which could have a very different RH than a reading 5 miles away, for example.

    There may be a hygrometer on your dehumidifier unit -- maybe that will tell you.

  • Samuel Charles Spriggs May 13, 2009

    Another thought is that the 65% you see may be where the display goes so many seconds after it displays where you set it -- it then displays the RH in the room. Do you have an owner's manual to check that?

  • Samuel Charles Spriggs May 13, 2009

    Yep, owner's manuals "ain't what they used to be".


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