Hmm, leaving Portland for Phoenix, have you experienced one of our summers? As for the scorps, if you are moving to a well established area, you don't have much to worry about. I have been here all my life and never had one in my house or even my neighborhood that I know of. I do know that the DE is common to use. It doesn't take much around the perimeter of your house if you have them in the area, if you don't, there is nothing to worry about. Talk to your neighbors to see if they have had them around.