Flights usually occur in the late spring or early summer. If you have a problem with carpenter ants coming into your house, they are most likely coming from the outside. The most important thing to remember is that they are primarily attracted to moist wood. Any possible sources of excess moisture found within a structure needs to be fixed. Another way to minimize the problem is to remove any vegetation, such as tree limbs, that are too close to or touching the house.
Ants also can enter houses along utility lines.
Properly sealed points of entry will eliminate this mode of access. Any other cracks or crevices in the structure are possible entry points and should be sealed. The key to controlling carpenter ants is locating the main nest and as many of the satellite nests as possible. The main nest may be hard to find for several reasons. First, carpenter ants are active at night.