How To Get Rid Of Cluster Flies

Cluster flies are tricky pests because, unlike houseflies, they don’t breed inside your home or business. Instead, they breed in soil outdoors and enter buildings in the fall to overwinter, hiding in attics, wall voids, and other protected spaces. Once inside, they emerge on warm days, often in large numbers around windows. While total elimination without professional help is difficult, there are effective steps a homeowner or business owner can take to manage them:

Exclusion (Prevention First)

Seal entry points: Inspect the exterior for gaps around windows, doors, soffits, siding, chimneys, and utility lines. Use caulk, weatherstripping, or expandable foam to block cracks.
Repair screens: Ensure window screens, vent covers, and door sweeps are intact.
Close gaps in attics and rooflines: Cluster flies often enter high points of a structure.

Vacuuming for Immediate Removal

When cluster flies appear indoors, the most effective non-chemical solution is vacuuming them up. Dispose of the vacuum bag or empty the canister outside immediately.
Avoid crushing them—cluster flies release a foul odor when squashed.

Light Traps and Fly Traps

Place UV light traps or sticky traps near windows or other sunny spots where cluster flies gather. This can help reduce their numbers in occupied areas.
Do not rely solely on these, as they won’t address hidden flies in wall voids.

Targeted Use of Insecticides (Optional, but Limited)

Aerosols: Pyrethrin-based sprays can kill exposed flies on contact but won’t solve the source of the problem.
Residual sprays: Spraying around window frames, attics, or entry points in late summer or early fall may help reduce the number entering.
Overuse of chemicals inside is discouraged because cluster flies tend to hide in inaccessible voids where sprays can’t reach effectively.

Seasonal Timing

The best chance to control cluster flies is before they enter, in late summer and early fall. Once they’re inside walls and attics, your options are limited to removal and waiting until they naturally die off.

Long-Term Maintenance

Regularly inspect and maintain the building exterior for cracks and gaps.
Store-bought traps and occasional vacuuming may manage visible flies, but prevention is the only reliable long-term DIY solution.

The Best Way To Get Rid Of Cluster Flies

Our professional pest control services are the most effective way to deal with cluster flies because these pests are notoriously difficult to eliminate once they’ve infiltrated a structure. Unlike common houseflies, cluster flies don’t breed indoors, so spraying or trapping them inside only addresses the nuisance temporarily. The real challenge is their behavior: they enter buildings in large numbers in late summer and fall, then hide deep in attics, wall voids, crawl spaces, and behind insulation—areas that most home or business owners can’t access safely or effectively. Here’s why our professionals are best equipped to handle them:

Specialized Knowledge of Seasonal Patterns: Cluster flies have a very specific life cycle and entry pattern. Our pest professionals know the right times to treat—typically late summer or early fall before these flies move inside. DIY methods applied too late are usually ineffective.
Professional-Grade Materials: Our exterminators use residual insecticides and dust formulations designed to target cluster flies as they attempt to enter or rest inside voids. These materials last longer and reach hidden spaces that consumer products can’t, providing more reliable control.
Access to Hidden Areas: Our professionals have the tools and training to safely treat attics, rooflines, soffits, and wall voids where cluster flies cluster in the thousands. A homeowner vacuuming or spraying exposed flies only addresses a fraction of the infestation.
Prevention Through Exclusion: We don’t just treat—we inspect. We identify and seal entry points around windows, eaves, vents, and siding, significantly reducing the chance of re-infestation year after year.
Protection of Property and Reputation: For businesses, visible swarms of flies around windows or light fixtures create an unprofessional appearance that can turn off customers. Our professional control ensures a faster, more discreet solution that minimizes downtime and complaints.
Long-Term Cost Savings: DIY efforts typically require repeated vacuuming, spraying, and trapping, but flies return every year. Our professional treatment program, coupled with sealing and exclusion, offers long-term relief and ultimately saves time and money.

Cluster flies aren’t just a seasonal annoyance—they’re a recurring structural pest problem. Our professionals provide a comprehensive approach that combines timing, treatment, and prevention to break the cycle and keep properties free of infestations.

Get Rid Of Cluster Flies With Miche Pest Control

Hiring our team of professionals at Miche Pest Control is an investment in long-term protection, expertise, and peace of mind. Here’s why:

Personalized Service and Local Expertise: We know the specific pest pressures in the area—such as seasonal rodent activity, regional ant species, or local termite threats. Our technicians understand the environment, climate, and building types common to the area, allowing them to provide targeted, effective treatments.
High-Quality, Comprehensive Solutions: As a full-service provider, we doe’t just treat surface problems; we address the root causes. From inspections and prevention to exclusion and ongoing maintenance, we deliver complete, integrated pest management (IPM) programs designed to both eliminate infestations and prevent future ones.
Accountability and Reliability: We live and die by our reputation. We rely on trust, referrals, and repeat business, meaning we're committed to doing the job right the first time and providing exceptional customer care.
Faster Response Times: We respond quickly to emergencies and schedule services sooner than large, national chains. Especially when you’re dealing with urgent pest issues like rodents or wasps, that speed matters.
Customized Treatment Plans: We tailor our services to your property’s specific needs instead of using one-size-fits-all chemical treatments. This results in safer, more effective pest control that minimizes environmental impact and reduces unnecessary pesticide use.
Highly Trained, Experienced Technicians: We invest in training, certification, and continuing education for our technicians. We stay current on the latest pest biology, control techniques, and safety standards.
Long-Term Prevention and Value: Our focus on providing quality service means fewer callbacks, longer-lasting protection, and better value over time. Instead of repeated, temporary fixes, you get strategic solutions that protect your home or business for the long run and provide better peace of mind.

Hiring our team means you get expertise you can trust, faster service, safer and more effective treatments, and long-term results that protect both your property and your peace of mind. Contact us today!