Hey gang, long time reader, first time posting! I have a pier and beam home customer that is getting excessive moisture in his home in the winter and other times a/c is not helping. He uses a meter to see that there is always more moisture in home than outside and the source is elusive. I inspected it several years ago without any issues found in regards to this: HVAC gas furnace is properly vented, has combustion air ducts and sealed closet, water heater and dryer are in adjacent but not connected garage. Crawl space is uneventful; dry and no signs of water leakage. He has been using a dehumidifier to lower moisture and there will be 20% outdoors, while over 50% indoors, he uses the dehumidifier and pulls it down and then it will climb right back up without using the HVAC at all. SO, what to look for? Thanks in advance!