Before you start any research into the paranormal field, rule out any rational explanations such as faulty plumbing, expanding floorboards, drafts or open windows, because all of the previous can make convincing phenomena.
Check for explanations
If you have good reason to believe that a paranormal presence resides in your home, research on the internet, local library and other record holders to find the history of your home for any potential triggers of the supernatural occurrences. Things like deaths, occult practices, former building uses and the site on which your home is stood.
Search for information