(and then the article has options for non-display storage) https://www.publicstorage.com/blog/stor ... king-young“Plastic and twist ties can cause harm and degrade dolls,”...Justice keeps his own beloved doll collection on display away from direct sunshine, because like with humans, light ages dolls. He also turns off artificial bulbs when he’s not in the room. And his dolls are behind glass to prevent dust. At the most extreme, museums recommend storing antiques at 71 degrees Fahrenheit and 42% humidity...“Absent that, the temperature and humidity should, as a minimum, be held at a constant level,” said Engelage. “Also, halogen lighting should be avoided completely because of the intense heat that is generated inside lighted cabinets. We recommended LED lighting and a clear window film to block UV sunlight.”
I would recommend keeping them in a climate controlled area - if they are in their plastic cases - you may want to keep them in a different box - like cardboard, that allows for better circulation.
https://www.fashion-doll-guide.com/wher ... dolls.html
https://www.thesprucecrafts.com/preserv ... ips-775182
https://www.familytreemagazine.com/pres ... old-dolls/