Hi A.,
Since I'm from Kentucky, we have a very bad ant problem there. My grandma put white vinegar (nothing else) in a spray bottle and sprayed: counter tops, floors, table legs & tops, baseboards, window sills, door thresholds, all bathroom fixtures and the floor, also if you have a porch entrance...sprinkle salt all over, they will not cross it. If you don't have a porch sprinkle salt on your walk ways & driveways and if you have outside stairs spray with vinegar. Or sprinkle with salt; it also helps with ice and
snow in the winter.
Another thing that helps... keeping your doors and windows closed tightly & using an air conditioner.
I sincerely hope this helps your problem, it sure helped ours.
Also, if you have a mouse or rat problem... put moth flakes or moth balls under counters in the corner, around holes where they enter, if possible under you house. If it is completely enclosed it will keep them from even coming under your house.
Good Luck~
C.