Mac, I'm with you. I have about 850 system gallons in my basement. I have a exhaust fan on a humidistat for the winters (no sense in using that in the summer as it will pull in 90% humid air), a dehumidifier running full time and a window AC unit running 24/7. With all this, I still hit 60-70% humidity in the basement
Our Furnace / AC does not have any return ducts in the basement. So, I am making Capncapo come over Sunday and help me put one in
