Dehumidifier drain

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ibisboy1

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I have a crawl space that I want to dehumidify. I have found a unit, but, not clear on how to drain.

The crawl sits adjacent to my basement (it is under an addition). My thought was to set the unit up in the middle of the space and the run a pitched line to an outside wall and drain that way. However, I am in illinois and it gets cold here. I don’t expect the unit to run much in the winter but I do have some concern that the line will freeze up.

As a note, draining to a drain/sump in the home is not possible. The basement is finished and I am not willing to open ip the ceiling to do the install.

Any thoughts about draining to the exterior? Any thoughts about how far from the foundation I would need to go? Had thought of perhaps draining into a small gravel pit, but not sure that would be needed.

Couple of other things worth mentioning. The crawl walls have been insulated with spray foam. The vents are sealed with spray foam. The floor has a vapor barrier down that was done as part of a radon remediation. So, it’s fairly well sealed.

Humidity can get as high as 70% on the most humid days of the year.

Thanks for any help.
 

Fitter30

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Southern Missouri dehumidifier in crawl space. Don't really need a dehumidifier under about 40° outside temp. Have a remote thermometer/ rh in crawl temp gets down to 54° when it's 0° and rh 40%. Have a outside temp control that shuts off dehumidifier at 40°
 

John Gayewski

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I think i would pump it to a drain. Not many condensate drains run to daylight here in the Midwest. You could do it, but the dehumidifier would need to be shut off before November.
 

Tim Moyer

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I'm in a similar situation. We are in the process of encapsulating our crawl space. I have a smart device that gives temp, relative humidity and radon levels. If the R.H. stays above 75% in the summer, I'd like to add a dehumidifier to the space. The easier option would be to purchase a unit with a pump and then run the drain to the exterior, about 4 feet from the foundation. I don't see a need for the dehumidifer in the cold months. This is in New Jersey.
A more costly option would be to run another dedicated circuit to a sump pump pit and have a sump pump drain installed.
It'll be interesting to see how the R.H. levels change after encapsualting the space.
 
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