Stink Bugs, like many other insects, enter into homes and businesses in search of shelter and a comfortable living environment. They tend to enter though gaps surrounding doors and windows, cracks in drainage systems, cracks in ventilation systems, poorly screened or open doors and windows, cracks in the foundation, and underneath siding. They will enter homes when cooler weather arrives in search of a warm place to spend the winter. Stink Bugs are attracted light sources, so any lights that are on at night may lead them to enter a home or business.