Mass migrations of false chinch bugs to buildings is primarily associated with very hot, dry weather. This may force the insects to move from drying weeds. The main weed hosting these bugs is the London Rocket it is a weed in the mustard family.
Insecticides will have little, if any, effect for limiting this situation and are not recommended. False chinch bug migrations resulting in nuisance problems in buildings usually are of short duration and rarely last more than a week.