Which types of flies are often found overwintering in homes in Tennessee?

Cluster flies and face flies are commonly found overwintering in homes in Tennessee. Cluster flies are particularly known for seeking shelter in buildings during colder months and can often be seen clustered in attics and wall voids before making their way into living spaces when temperatures rise. They are larger than house flies and have a distinctive golden sheen. Face flies, while they do not overwinter as consistently as cluster flies, may also seek refuge in buildings as the weather changes.

In contrast, house flies and fruit flies, while prevalent in various environments, tend to breed in locations where food sources are available and do not specifically seek out shelter for the winter in the same way as cluster flies and face flies do. Bluebottle flies and drain flies have similar patterns, but again are less associated with overwintering behavior in homes. Therefore, the specific association of cluster flies and face flies with wintering in homes makes this the most accurate choice.