To minimize these kinds of problems in the future, it is important to treat these insects in the fall as they are first trying to enter your home. This is a two-pronged approach. First, it is important to inspect the outside of the home during summer and seal spaces and gaps that may be used by the insect to get inside. This can be followed up with an insecticide application in the fall, just as these insects are trying to get inside. This insecticide application is typically applied to the outer perimeter of the home. It is not possible to prevent all nuisance insects from entering into a home, but you can reduce the number that do, causing fewer headaches later during the winter and spring.