Sellers installed the interior gutter/sump pump combo in 100-year-old house before I bought; probably had bad water problem previously. While water does not accumulate, the basement is still very damp, so that it's impossible to store anything down there without mold. There are weeds growing in through the walls in some spots so I'm assuming a wall sealant might help... I'm also wondering if a dehumidifier would be worth the energy cost in an unfinished basement. Any advice is most appreciated from this first-time home buyer