Our recommended method for exterminating not only the Carpenter Ants but Fire Ants, Pharaoh Ants, and Pavement Ants is using dual bait gel.
This is a better method for indoor application as it is safer, cleaner and least intrusive.
Whereas the Ants may avoid an area that has been sprayed with an insecticide, they may gladly go for the bait. Not only the foraging ants expected to feed themselves but they are likely to carry the bait back to the colony ants. In time all the ants of a colony would be exposed to the active ingredient in the bait and the nest would collapse resulting in complete elimination.