Understanding Cluster Flies in Lancaster, PA

Jim Raifsnider • November 11, 2025

Cluster flies are a persistent nuisance in Lancaster, PA—especially during seasonal transitions. Here's how All County Termite & Pest Control tackles cluster fly infestations with expert treatment and prevention strategies.

cluster fly v housefly | Call All County for flies and pest control service in Lancaster pa

Understanding Cluster Flies in Lancaster, PA

As the seasons shift from summer to fall, homeowners in Lancaster, PA often notice an uptick in unwanted guests—cluster flies. These medium-sized, sluggish insects are drawn to warm surfaces, particularly the sunlit southern and western walls of buildings. Unlike house flies, cluster flies in Lancaster, PA don’t breed indoors or feed on garbage. Instead, they originate from the soil, where their larvae parasitize earthworms before emerging as adult flies.

 

While they pose no direct health threat, cluster fly infestations in Lancaster, PA can be overwhelming. These pests gather in large numbers, especially in attics, wall voids, and unused rooms, creating a frustrating and unsightly problem for homeowners.

 

 

Why Cluster Flies Invade Homes

Cluster flies are notorious for their overwintering behavior. As temperatures drop, they seek refuge in warm, insulated spaces. Cracks around windows, siding gaps, soffits, and attic vents become entry points. Once inside, they remain dormant until a warm winter day triggers activity—leading to sudden swarms inside your home.

 

This behavior makes cluster fly control a seasonal priority. Without proper intervention, the infestation can repeat year after year, growing in scale and disruption.

 

 

Cluster Fly Control: Prevention Is Key

At All County Termite & Pest Control, we emphasize cluster fly control through proactive measures. The most effective strategy begins in late summer, before the flies enter your home. Here’s how we help Lancaster residents stay ahead of the problem:

 

  • Exterior Sealing: We recommend you or a home improvement professional seal cracks, gaps, and crevices—especially on sun-facing walls.
  • Vent Screening: Have foundation, attic, and gable vents fitted with tight screens to block entry.
  • Targeted Treatments: Our technicians apply professional-grade treatments to the exterior walls, eaves, and rooflines. This is best done in mid to late August, when cluster flies begin seeking shelter.


These steps drastically reduce the likelihood of a cluster fly infestation in Lancaster, PA, keeping your home protected through the colder months.

 

 

Professional Cluster Fly Treatment in Lancaster, PA

If cluster flies have already invaded your home, DIY methods often fall short. Vacuuming visible flies may offer temporary relief, but it doesn’t address the hidden populations nesting in wall voids or attics.

 

That’s where our expert cluster fly treatment in Lancaster, PA comes in. All County Termite & Pest Control uses specialized equipment and insecticides to reach inaccessible areas. Our technicians are trained to identify nesting zones and apply treatments that minimize fly activity without compromising your indoor air quality.

 

We also offer follow-up services to ensure long-term success. Our goal is not just to eliminate the current infestation, but to prevent future outbreaks through strategic planning and seasonal maintenance.

 

 

Why Choose All County Termite & Pest Control?

As a locally owned and operated business, we understand the unique challenges of cluster flies in Lancaster, PA. Our team combines deep regional knowledge with cutting-edge pest control techniques to deliver results you can trust.

 

  • Customized Plans: Every home is different. We tailor our cluster fly control strategies to your property’s layout and exposure.
  • Transparent Pricing: No hidden fees—just honest service.
  • Guaranteed Satisfaction: We stand by our work and offer solutions that last.
Learn more about Cluster Fly Treatment in Lancaster, PA today | All County Termite & Pest

Identification | Cluster flies are often mistaken for houseflies but have distinct features: 


  • Size: They are slightly larger than houseflies, typically about 3/8-inch long.
  • Color/Hair: They are dull gray with black markings and covered in short, golden or yellowish hairs on their thorax (mid-section), which can give them a golden sheen.
  • Movement: They are sluggish and slow-moving, flying in a lazy or erratic manner.
  • Wings: When at rest, their wings overlap over their abdomen, a key difference from houseflies, which hold their wings apart.
  • Smell: When crushed, they may leave a greasy spot and an odor similar to buckwheat honey. 

Schedule Your Cluster Fly Treatment Today

Don’t let cluster fly infestations in Lancaster, PA disrupt your comfort. Contact All County Termite & Pest Control today for a free consultation and customized treatment plan. Whether you’re dealing with an active infestation or want to prevent one, we’re here to help.

 

Call now or visit our website to schedule your cluster fly treatment in Lancaster, PA—and reclaim your home from these seasonal invaders.

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