I need advice folks. My house on our two story family farm house was built in 1988 with a 5' high crawlspace with poured concrete foundation walls and piers, and it has foundation vents. I put down a heavy plastic vapor barrier over the dirt floor back in 1988. In recent years we added on another section of house with similar crawlspace height, foundations, piers and vapor barrier over dirt floor. I have my heat/ac air handlers down under both areas. My floors above each crawl space are insulated with batt insulation. The crawl space is dry with no water issues because I have and maintain gutters around my house. I do not notice any smells coming up into my house. The crawl space areas total about 2000 sq ft. I do see some mold/milder on the floor joists, but it does not seem excessive to me. My question: Should I encapsulate? Would my house be better off in the long rundoing so or leaving this as is. I had an estimate broken down into parts as follows: $6,000 (10 mil thickness), $9,000 (20 mil thickness) to encapsulate. He recommended removing all old vapor barrier and joist insulation ($1950), and cleaning the joists and subfloor with a cleaning solution ($7300), putting in a Santa Fe Advance 100 dehumidfier ($1925). This house is on a family farm and will be in the family "forever." So is there a benefit to encapsulate? Or is all good as is now?
I appreciate any good thoughts on this matter,