Which method is effective for nonchemical control of carpenter ants?

Removing logs and stumps that possibly have nests is an effective method for nonchemical control of carpenter ants. Carpenter ants are attracted to moist and decaying wood, which often includes logs, stumps, or other wooden debris that may serve as nesting sites. By eliminating these potential habitats, you reduce the chances of carpenter ants establishing a colony in or around your home. This proactive approach minimizes the risk of infestation without the use of chemical treatments.

In contrast, applying insecticide to the nests directly targets the ants but involves a chemical solution, which the question specifies to avoid. Replacing all infested wood can be a solution for existing infestations but is often impractical and expensive, especially if the extent of infestation is not completely clear. Keeping the house free of dirt and dust may help in general cleanliness and hygiene but is not specifically targeted at preventing carpenter ants, which are more concerned with the presence of suitable nesting materials than cleanliness.