storing dahlia tubers

Our new house doesn't have a basement or attic. Or a garage. It has a beautiful view and great location. After I dug my dahlia tubers I realized I had no place to store them for the winter. Dahlias need to be at about 50*F and low humidity to overwinter. After almost a month of sitting in our house at almost 70*F, my dahlia tubers were starting to sprout. So, today I brought them up to my parents' house. My dad will put them in his basement with his dahlia tubers.

One of the things I would like to work into the renovations we will do on our new house is to build a small basement, or root cellar. Some vegetables do fine being stored in the kitchen at 70*, like sweet potatoes and dried chilies. Some are best in a refrigerator, like beets and carrots. But the onions, garlic, potatoes, squashes and dahlias really need the cellar. We have a space that should work for a cellar and hopefully we'll be able to build this by next winter.