How do you kill ants that come into the house? Our house is on a concrete base. They seem to come through the heating ducts in the concrete. The pipes are clay, and the ants live there summer and winter.
Sprinkle hot pepper flakes near the ducts where the ants come in. If that doesn’t work, try ground cloves. Also wipe the area where you see the ants with a solution of equal parts white vinegar and water.