I don't know what the winters are like in NC but assume you have periods of
frosty weather.  My preferred method would be to put a box over a strong hive
and allow the bees to have access.  They can then undertake caretaking duties
and use some of the stores if they feel the need.  Otherwise stack them in a
cold spot with through ventillation with a queen excluder top and botton to
keep mice out.
Chris Slade