Ventilation in crawl space

[Gustaf321]

We bought our house about four years ago. The humidity in the crawl space was high during certain periods, so we installed a dehumidifier and sealed all the ventilation holes. We now have 70 percent humidity there. Is there any risk with having no ventilation in the crawl space, and if so, should we install a fan to create negative pressure in the crawl space?

 

[Leafy]

What kind of dehumidifier is installed? I have a Corroventa in mine and it only has an exhaust, everything else is sealed = negative pressure.
If you have a dehumidifier, you don't want it open to the outside, then the dehumidifier will try to dehumidify the whole world and you'll get an expensive electric bill.

 

[Gustaf321]

What kind of dehumidifier is installed? I have a Corroventa in mine and it only has an exhaust, everything else is sealed = negative pressure.
If you have a dehumidifier, you don't want it open to the outside; otherwise, the dehumidifier will try to dehumidify the entire world and you'll get an expensive electricity bill.

It's a Woods SW38 so it doesn't have an exhaust.

 

[Robert N]

What type of dehumidifier is installed? I have a Corroventa in mine, and it only has an exhaust, everything else is sealed = negative pressure.
If you have a dehumidifier, you don't want it open to the outside, as the dehumidifier will try to dehumidify the whole world, and you'll get an expensive electricity bill.

Hi, side note on an old thread but how do you find the noise level of the Corroventa? Considering installing one but it seems to make quite a bit of noise. Regards

 

[Robert N]

We bought our house about four years ago. The humidity in the crawlspace was high at certain times, so we installed a dehumidifier and sealed all the ventilation holes. We now have 70 percent humidity there. Is there any risk with having no ventilation in the crawlspace, and should we then install a fan to create negative pressure in the crawlspace?

Hi, having similar thoughts. Old thread but trying to ask what you concluded?