My house, a 1947 cape in Massachusetts, is always much more humid that outside, in all seasons. Even when running the dehumidifier, one in the basement, and one on each of the two main levels, it rarely falls below 50%, even when outside is only in the teens or 20s. I've had a few outbreaks of mold, when I failed to run the dehumidifier regularly. This is an issue that is too big for me to address. So, I'd like to bring in an expert to assess and address the situation. Yet, I haven't been able to find one. Who should I call in a situation like this? Thanks!
I had a home in Ohio with a basement that had high humidity a large dehumidifier running 24-7 pulled an amazing amount of moisture out of the air. Late in the summer we epoxy painted the floor with a 2 part epoxy and this alone greatly reduced the moisture in the house.
We had taped plastic down in 5 places in the basement for 24 hours to see if there were places that were worse (the front of the house was very wet, we had to wait until summer for the moisture to be low enough to paint (according to the directions) after that we did not need the big dehumidifier coating the floor but we still did use a much smaller model , I have coated quite a few basement floors since then all with similar results so you may give this a try.