Celluloid dolls need to be kept away from heat. Do not keep them sealed in a case or they might burst into flames. Cloth dolls should be displayed away from sunlight, with mothballs nearby. Composition dolls should be displayed in places without extreme temperature changes. Hard plastic dolls should be kept away from direct sunlight.
Heat can warp the doll.
Vinyl dolls are susceptible to extreme room temperatures. Keep them away from heaters and air conditioners. Sunlight and fluorescent light can be damaging. Tightly sealed cases can cause condensation to form and damage the dolls. Wooden dolls are easily damaged by humidity and insects.