answer:Cold temperature isn’t going to hurt much of anything. Books will survive no problem. Artwork, possibly – are you talking oil-paint art or water color, or what? Oil paint can crack if it gets cold enough, but posters and other art, not to worry. Wood furniture again, probably is OK. Heat is actually worse than cold. The key point is humidity. For all of those, but books and wood especially, humidity is a killer. Much more danger of damage from humidity than from temperature.