In term of thermography, seen as the thermal imager of the door of the tower. It should be protected to lead of coldness into the tower by placing double door in order to save a heat. For example, this method has used for Castelvecchio (Verona) was built 13th century and located close to Adige River. There has double door and window to protected dampness from the river (seen as images). It might be a good example in order to apply with this problem.