No need to spray chemicals inside. Spray the outside foundation with a chemical barrier product. Unless the ants have established a nest inside the walls, they will not be able to cross the barrier. Back up plan would be to use Terro ant bait. Ants carry it back to their nest and it kills the whole colony. I have been known to follow the ant trail back to their nest with a flash light. One little squirt of ant spray at their point of entry solves the problem.
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