dehumidification below 40 dewpoint ????
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  1. #1
    Join Date
    Aug 2011
    Location
    EC Wisconsin
    Posts
    55

    dehumidification below 40 dewpoint ????

    Hello,
    need some help. we have a prospect who is on the fence that a dehumidifier is the answer to his humidity problems in this lovely frigid weather we are having. I am being told from manufacturer that the unit cannot go below 40 degree dew point and that if he wants his humidity lower than 40% he has to turn the heat up.
    one thought is could we put in an inline duct heater to fool the unit into a higher room temperature to get the humidity lower.
    any help is greatly appreciated.
    thank you,
    Kathy

  2. #2
    Join Date
    May 2013
    Location
    Fort Worth, Texas
    Posts
    4
    Why not induce some of the outside air to reduce the humidity.
    It sounds like the structure needs some OA ventilation since they typical problem in frigid weather is too dry, not too damp.

  3. #3
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    6,229
    Quote Originally Posted by tompa View Post
    Why not induce some of the outside air to reduce the humidity.
    It sounds like the structure needs some OA ventilation since they typical problem in frigid weather is too dry, not too damp.
    Good suggestion. When the outside air has a dew point below 32^F, outside air is a more cost effective way of reducing indoor %RH. Spaces with high indoor dew points during cold windy weather usually are not get enough fresh air.
    On the other hand, as the outdoor dew points rise above 50^F, supplemental dehumidification is very effective at maintaining low indoor %RH.
    A properly install whole house ventilating dehumidifier with outside fresh can provide >40%RH throughout the year. Special sizing may be needed. Who was the dehu manufacturer that commented on the limitation?
    Regards TB
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
    Use +Merv 10 air filter. -Don't forget the "Golden Rule"

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