My guinea pigs are currently in their hutch inside a shed. They have their rain cover, blankets on top of the cage, extra bedding and food etc, and the doors to the shed get closed at night. They seem perfectly happy and healthy right now, but the temperature is getting even worse and I'm worried it will make them ill soon. What temperature is the minimum that they can be in (in their conditions inside the shed)? And would it be better to bring them in for a few weeks till it's warmer, or would the change distress them? They came inside last winter, but it's not easy now as we no longer have the same cages and they are fully grown now.