Silverfish are always looking for warm and humid environments. They prefer an environment that is somewhere around 70 to 80 degrees Fahrenheit. Therefore, most human properties are the best place for silverfish. It makes it easier for them to breed and live in such areas. For example, cupboards, attics, basements, roofs, walls and other humid areas. This is because they require this amount of humidity for their eggs. As then only they will hatch and make the breeding an easy process.