Hello, new here to the forum. Where I live (NW Indiana) we recently got 5"+ of rain in an afternoon. I realized we got 8" in our crawlspace the same day we got the rain. I was able to use a sump pump to remove the water the next day. Our crawlspace is about 20" tall and we have no drainage system. Today a crawlspace contractor showed up to check for mold, any damage and give me a quote for a drainage system. We do have a little bit of mold, (concerning, but not major). I was quoted $8700 for mold remediation, crawlspace encapsulation, drainage installation and installation of exterior crawlspace entry door. One question I really had that I have never heard of is after the encapsulation is put in and the crawlspace is completely sealed up, he mentioned putting in register vents in the ductwork, to condition the space to reduce the mold growth, with the added benefit of keeping the pipes from freezing in the winter and warmer floors. Everything made sense to me, but I had never heard of it as well as wondering if there is any concerns of doing this. I should mention my house is a 1200 sq. ft. brick ranch built in 1948.