Silverfish usually enter homes through shake shingle roofs and camp out in the attics. They are nocturnal so you’ll mostly only see them at night in damp places like bathrooms, or near the ceiling if they are coming from the attic. They thrive in heat and will lay eggs in cracks and crevices when the temperatures are right.
While they don’t bite or spread disease, they can destroy fine fabrics and paper. They also attract other pests like brown recluse spiders.