My boys live in my shed in hutches with the doors open so they can play on the shed floor (during their own turn given I’ve got two who fell out!).
The shed is insulated with silver foil insulation stapled onto the walls, ceiling and floor.
If the weather is very cold, and even though the shed is insulated, they will still stay locked in their hutches on those days. (I don’t have heating in the shed)
I’ve moved your post to its own thread in the correct section of the forum. Please always start your own new thread about a new topic rather than comment on somebody else’s with your own question. That way it ensures you post is not missed and is in the right forum section.