Some common occasional invaders are crickets, silverfish, weevils, dobsonflies, beetles, earwigs, millipedes, centipedes and stinkbugs. Some are harmless while others are destructive. Ladybugs are highly beneficial to the environment and your garden, while the silverfish can destroy books, clothing, and dry foods.
Mostly these creatures are a nuisance but some will bite you and your pets, some will invade your food, eat fabrics and carpet, and leave waste behind. Also, other bugs and creatures who like to eat these invaders will follow them inside in search of an insect meal.
Entry: Pests enter your home through small openings, open windows and doors, and even on humans and pets.
Do-it-yourself Effectiveness: Sealing cracks and crevices with caulking and installing functional weather stripping to reduce the entry points is important. Outside it is important to move dead leaves, yard clippings and water sources away from the house, and avoid planting shrubbery next to the house. Inside it is important to vacuum and dust regularly and discard of the canister contents away from the house.