This was actually prompted by a question at another site where someone was having problems with negative entities in their home.

Energy Cleansing: Position yourself as near as possible to the center of your home. Now visualize a large ball if intensely glowing white light above your head. Visualize a bright beam of violet light coming down from that glowing ball and entering the top of your head. Feel that light flowing into you and filling your entire body. Keep bringing it in as you allow it to flow outward from your body. As it flows out, visualize it as violet flames, filling and surrounding your home and "burning away" all negative energies as it does. After you have filled and surrounded your home with these cleansing energies, switch to a white light. Do the same with the white light as you did with the violet, except that there will be no flames. Encase your entire home in a "bubble" of white light. It won't hurt at all to let the bubble extend outward from four home for some distance.

Walking the Perimeter: Years ago one of my teachers used to frequently repeat, "Walk your perimeter." Now what did he mean and how do you walk the perimeter? Basically this is adding another "shield" to your dwelling. Do it like this. Position yourself outside of your home, but preferably inside of the bubble of light that you erected in the previous step. Now bring in the energy, just as you did before, only instead of allowing it to spread outwards in all directions, you are going to allow it to spread up and down only, and curve inward. Start walking around the perimeter as you do this, you are now building a reflective shield around your home. Walk all the way around, and end up back at your starting point. Your home should now be encased in a reflective shield.

Portals: Plug or seal any portals that you can locate with white light.

Now what have you done? First of all, the violet flames that you used will transmute any negative energies into positive ones. Any negative entities that happen to be in the area at the time will leave because it will be uncomfortable to them. The white light will keep them out. And the shield will stop any negative energies directed at your home. One caution. You have made your home a very positive place, energy wise, but any negativity generated in the home (fear, anger, annoyance, etc) will destroy all of your work. So I always found it best to do this after children were asleep and whatnot.