A place has memory. Emotions and habits that have lived in a place can stay around much longer than wanted. If we live in old houses, we actually swim in the energy of the past. Who knows what has happened in a place? None the less it certainly influences us in our daily life. Restlessness, stress, sleeping badly, feeling tired, to many arguements, no inspiration, depression ...
All these unwanted energies can be cleansed. This goes hand in hand with harmonisation.
From an energetic point of view, this is how past emotions and habbits look like in a house. They are scattered all over and make it hard to bring your energy into your home.