Have stored in unheated garage in pots (which I grow them in)with very infrequent watering. All came back after dying down to root. With the big EEs in the ground, I dig up tubers and store in same garage environment in a mesh bag of wood shavings. Polly goes in sunny window in guest room facing south. Still looks pretty sorry at end of winter, but comes back when placed back outside in late spring.
Good luck,
LU