Cluster flies are a type of fly that is known for congregating in large numbers, especially in the fall and winter months. They are typically larger and slower-moving than other types of flies, and are often found in homes and other buildings where they seek shelter from the cold. Cluster flies do not pose a direct threat to human health, but their presence can be a nuisance and they can create unsanitary conditions.

Cluster flies are a nuisance because they can congregate in large numbers, often in hard-to-reach areas like attics and wall voids. They also have a tendency to leave behind fecal matter and other debris, which can create unsanitary conditions and potentially lead to health issues. In addition, the presence of cluster flies can be alarming and distressing for homeowners.

The most common sign of a cluster fly infestation is the presence of large numbers of flies congregating in certain areas of your home or building. You may also notice dead flies or fecal matter in these areas. Cluster flies are typically found in warm, sunny areas like attics, so if you notice flies in these areas of your home, it's a good indication that you may have a cluster fly infestation.

Cluster flies typically enter homes and other buildings through small cracks and openings, such as around windows, doors, and vents. They are attracted to warm, sunny areas, so south-facing walls and roofs are often a prime entry point. Once inside, they may congregate in hard-to-reach areas like attics and wall voids.

To prevent cluster flies from entering your home, it's important to seal any cracks and openings around windows, doors, and vents. You can also install screens on windows and doors, and use weatherstripping to seal gaps in doors and windows. Regular cleaning and maintenance, such as vacuuming and dusting, can also help reduce the number of flies that enter your home. It's also a good idea to keep your home well-ventilated and dry, as cluster flies are attracted to warm, humid areas.

Cluster flies are not known to bite humans or transmit diseases, but their fecal matter and other debris can create unsanitary conditions and potentially lead to health issues. If you have a cluster fly infestation, it's important to contact a pest control professional to address the issue and minimize any potential health risks.

Cluster flies are typically treated with a combination of insecticides and physical removal methods, such as vacuuming and sealing cracks and openings. It's important to contact a pest control professional to develop a treatment plan that is tailored to your specific situation, as DIY methods may not be effective and may even be dangerous.

The length of time it takes to get rid of a cluster fly infestation can vary depending on several factors, including the severity of the infestation and the treatment method used. In general, it can take several weeks to several months to fully eliminate a cluster fly infestation. It's important to work with a pest control professional to develop a treatment plan that is effective and sustainable over the long term.

While there are DIY methods for controlling and preventing cluster flies, it's important to contact a pest control professional for a thorough inspection and treatment plan if you have a cluster fly infestation. DIY methods may not be effective, and some insecticides can be dangerous if not used correctly. A pest control professional will be able to develop a treatment plan that is tailored to your specific situation and will ensure that the infestation is completely eliminated.

To ensure that cluster flies do not return, it's important to take steps to prevent them from entering your home in the first place. This includes sealing any cracks and openings around windows, doors, and vents, as well as keeping your home well-ventilated and dry. Regular cleaning and maintenance, such as vacuuming and dusting, can also help reduce the number of flies that enter your home. It's also a good idea to work with a pest control professional to develop a long-term prevention plan that is tailored to your specific situation.