Fly Problems:

Cluster flies tend to enter homes and buildings in large masses in late summer or early autumn to seek shelter for the winter months. They can squeeze their bodies through any exterior crevices of a home, such as cracks around windows and doors, air conditioning vents, screening vents, and loosely hung siding. Once they enter a structure, they usually hibernate in inaccessible areas between walls and in ceilings until spring when they emerge and seek access to the outdoors. Although they generally do not cause any true damage to home structures, textiles, foods, or humans, many dead flies piling up in the walls can sometimes lead to secondary infestations of carpet or larder beetles and rodents, which feed on the flies.