Would it help at all if I made a solution with mint oil and maybe sprayed it around the outside perimeter of my house?
Wouldn't hurt to try. Spray the foundation walls outside, then around the inside from the basement. Get up high where the foundation meets the house, since that is where they would be climbing in. They travel the walls and floor spaces between joists, so treat from the entry points in the basement then also around the top from the attic. Of course a few current residents may be stuck in between...
If nothing else, it will smell minty fresh at your house!