I have a new mobile home. When the heat or a/c kicks on and then off, it takes a few moments but eventually it sounds like there are little moles with hammers under my floor. The sound goes from the center of the bedroom to the wall. It's got me wanting to pull my hair out. I can walk on part of the floor and it sounds like one of the boards may be loose, but the only way to know for sure is to pull back the carpet. I would appreciate any help. Thanks.