Winter proofing hutch ideas

Hi...just wondered what everyone does to make sure their bunnies are warm over winter. I have put silver insulation around the walls and lots of hay and sawdust.
Is there anything else I can do? [emoji195]

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It's the damp that is the problem more than the cold. Have you got a cover over the hutch? Also sawdust is not good for rabbits as it can cause respiratory problems.