I was checking the crawl space few days ago and I noticed some ducts dripping moisture to the point that some small puddle of water were collected on the ground. The crawl space is 1500 sq ft, two feet high with plastic applied everywhere on the ground. All perimeter vents are closed and there is no musty odor. Of course, these days with triple digit heat index temperature and high humidity may have caused this situation. I haven’t noticed it until now, but it doesn’t mean that it did not exists before.
The 9 year old heat pump is a 3-ton package unit and the duct work is all flexible. The system appears to be operating very normal.
The recent consensus is that a crawl space should have plastic applied to the dirt floor and all vents should be be closed. There is no ventilation. I am sure that whoever conceived this idea know a lot more than I do on the subject, but I just can’t help to believe that ventilation would be helpful in preventing this condensation.
What would be a practical solution, fan, dehumidifier, open the vents during the summer or leave it alone?
Please share some of your thoughts.