The correct way to keep a hop plant in a pot during the winter period is to place it outside against a south wall covered in rain and snow.
In areas where it freezes a lot (below-5 ° C), you might want to think about putting it in a porch, or in a cold garage only for the days needed. Darkness won't be a problem until mid-February.
However, it is vital for the plant to be properly hydrated. A MRHOPS potted plant should weigh around 4-5hg.
If placed inside small winter greenhouses, you need to have the common sense to open them in the hottest hours of the day.