Seal cracks and gaps around windows, doors, vents, pipes, and siding with caulk or weatherstripping
Install or repair door sweeps and ensure doors close tightly
Add screens to vents and repair damaged window screens
Use window/door sealing kits to reduce entry points
Remove boxelder trees or female trees nearby if feasible
Reduce nearby seed sources by removing boxelder seed pods from trees and branches
Rake up and discard fallen seed pods and debris regularly
Vacuum bugs from indoor areas using a shop vac with a hose attachment
Wash remaining bugs off with soapy water and dispose of the debris outside
Apply residual insecticide labeled for boxelder bugs (follow label directions) to entry points and exterior cracks
Focus treatments on perimeter areas: foundation edges, window frames, siding seams, eaves, and utility penetrations
Use insect growth regulators labeled for exterior use to reduce breeding in treated areas
Place sticky traps near entry points to monitor activity and reduce numbers indoors
Use a professional pest control service if infestations are heavy or persistent
Keep outdoor lights off or reduce brightness at night near entry points to limit attraction