Spray the outside of the house, around the foundation, windows, doors, and other entry points with Household Insect Control or Total Pest Control.
It sounds like you may have Boxelder Bugs. You can use Bonide Household Insect Control, Total Pest Control or Eight Home & Garden Insect Control. Spray the outside and inside of your house around the windows and other entry points to kill the insects.
Do not re-enter the area being fogged for 2 hours. Then open windows, vents and doors for 2 hours. If the odor is still detectable, additional ventilation is required.
Pets must be removed and fish tanks must be covered.
One can will cover an area 27 x 27 with an 8 ft. ceiling or 6,000 cubic ft. of unobstructed space.