Most commonly, Cluster Flies begin to invade homes in the early fall looking for warmer spaces to overwinter. 

Cluster Flies, Asian Lady Beetles, Conifer Seed Bugs, Boxelder Bugs and Stink Bugs are all Fall Invaders. 

These pests can cause damage and reproduce rapidly.  When not treated at the appropriate time, these pests can become a much bigger problem in the spring as the weather becomes warm again and they are trying to get back outdoors.

Exterior preventative treatment is done annually in late summer/early fall. Treatment includes spraying siding, around windows, trim, eaves, and soffit to form a barrier to prevent flies from coming in.