I wouldn't overwinter them in a heated area. They need a cold period to go dormant. An unheated garage or root celler, or outbuilding of some sort would be ideal to keep them in. If they are in an indoor area such as these, remember to water them very lightly once every other week or so.
If your winters are not very severe, they can be kept outdoors in containers, providing you give the roots some sort of protection against the wind and freezing conditions. Ideally they should be stored on the ground, near the base of some wall or large, wind-breaking structure. They should have straw or hay or something piled up around the containers [to help insulate the container] from freezing and wind. You probably won't need to water them at all if they are outdoors.