hydrangea cuttings.

[erob914]

I have been growing some hydrangeas from cuttings I took in July. I have 8 plants right now growing in a sunroom where they get partial sun and stay warm during the day.
What I need to know is weather I need to bring them inside to keep them warm during the winter or do I leave them in my sunroom to overwinter and go through a regular dormancy period.
Thanks for the help. Eric.