Occasional invaders consist of a wide group of insects that may invade your home occasionally, but do not typically take up residence there. Most of these insects do not want to be inside your home. Some of them cannot even survive once they have entered homes like crickets and woodlice. Occasional invaders are active year-round and can enter your home at any time. These insects tend to be most problematic to homeowners during the fall season as they are trying to find a place for the winter. However, these insects do enjoy and spend the majority of their time outside.