Carpenter Ant Problem
I think I heard that carpenter ants invade when a part of the wall is moist? Like failing wood siding, windows, roof, or gutters?
I think the best way to limit bug infiltration is to make sure that on the outside of the home, there are no trees, bushes, or plants right against the foundation, and that the outside of the home is in good condition and not absorbing moisture through a weak point.
We currently are getting several bugs (including a few carpenter ants) becuase our front siding is a disaster.... We're in the process of getting it and the front windows redone. In the past, corrective measures like that always eliminated the problem.
hope this helps!