To avoid Carpenter Ant infestations, there are a few important points to follow. First, remove all rotten wood around the building, be sure you do not bring any infested wood into the house, and do not store firewood for long periods. Also be sure that tree branches do not touch the building structure. As a further measure, keep the building’s gutters clean. To avoid reinfestation, it is also best to replace any wood that has rotted where building components meet, if possible.
The ants you see walking around are worker ants. Their job is to find food and bring it back to the nest. Once a worker ant finds a “feast,” she returns to the nest with her treasure while leaving an odor trail of pheromones to mark the way back. If you watch where ants go when they are carrying food, they will lead you to their nests.