It's very important to understand that your walls talk!
We are all made up of energy, and sometimes people will leave some of their difficult energy behind when you actually did not request it.
Nothing like a good smudge, a spiritual cleansing.
In a house or office clearing every room is read separately then and overall clearing and toning is done.
Toning is again vibrational and calls in the flora and fauna and spiritual divas and the elders of the land so it is a collective energetic learning.
I usually leave the client with a clearing package that contains incense and smudge.