Customer LoginAs soon as the fall approaches, the cluster flies begin to enter homes and buildings in large numbers. At this time of the year, the days become shorter, and temperature begins to fall, hence they enter homes in search for overwintering sites.
During this time, the west and south facing buildings are exposed to more sunlight, so the cluster flies are attracted more to such buildings due to the warmth they can get there. They enter these buildings through small openings or cracks and crevices near window or door frames, open or unscreened windows/vents.
Once inside they gather together in an isolated, safe place such as attics or false ceilings and begin to hibernate. Generally, these sites are the upper south or west sides of the buildings.
Prevention is the best measure to keep away Cluster Flies. Fall months are the times to have an A1 Exterminator come to your home to do a preventative maintenance check.