I live in New England and house many torts inside all winter... they have an 8X12 shed that is super insulated... dirt floor with hides/tunnels and a small cement pond for water. it is attached to and 8X12 greenhouse that they can go into on nice days and that green house has tunnels that lead outside into 2 different tort pens for spring thru early fall. they have free roam of where they go and I just control where they go according to the weather... I have some pics... i will look through them and find the best ones Do you want them emailed or posted here?