Seal cracks and gaps around windows, doors, siding, vents, and foundations
Repair damaged screens and weather stripping
Remove box elder trees and female seed-bearing trees near the home if possible
Clean up fallen seeds, leaves, and debris around the yard
Reduce outdoor lighting near entry points at night
Vacuum bugs indoors and dispose of the vacuum bag or contents immediately
Use a broom and dustpan to remove bugs from walls and windowsills
Apply residual insecticide labeled for box elder bugs to exterior entry points
Treat sunny south- and west-facing walls where bugs gather
Spray cracks, crevices, and around doors and windows with a labeled insecticide
Use soapy water to kill bugs on contact
Wash exterior surfaces where bugs cluster with a hose or pressure washer
Call a licensed pest control professional for heavy infestations
Prevent re-entry by keeping doors and windows closed when possible
Store firewood and yard materials away from the house
Keep attic and crawl space vents screened and sealed