One of the very first things I did after taking possession of my new home was to complete a purification.
I began by inviting and welcoming my gods into my home and asked them to overlook the purification and bless my new abode.
Then, I adapted Scott Cunningham's four elements purification as described in his book The Magical Household. I will obviously not reproduce the spell here (get a copy of the book, it is excellent), but I will describe the slight modifications I made.
My new home has three stories, which include a hard to access basement. So, I did the purge on the two levels to start. With each pass, the 1st and 2nd stories felt brighter and more homey, while the basement began to feel sinister. When I was done purifying the two levels, I then used a bit of each of the elements to do one pass through the basement. I carefully shone a light into all the dark corners of that creepy place until it felt like my own private dungeon. When I was done, the whole house seemed new and clean and my own. I then tossed my used supplies out the back door to purify my outdoor space. I should point out here that the 'supplies' included some salt water, a bit of burnt candlewick, and some incence ashes, nothing that is too environmentally damaging.
I cannot over emphasize the importance of spiritually purifying your new home, and updating that purification whenever you feel that negative energy has settled into neglected corners.
Tomorrow, I will do a sort of reverse purification at my old home as I sweep it clean of all the residual energy from my old life to prepare the home for new owners.
"Life's but a walking shadow, a poor player that struts and frets his hour upon the stage and then is heard no more. It is a tale told by an idiot, full of sound and fury, signifying nothing."