I am considering purchasing a rhino iguana, I have a great space in my backyard, an 18x18 foot concrete slab I could build anything on. If I build an enclosure there I would have enough space to build an insulated basking room to protect from the cold and enough space for an adult iguana to be completely content, I was also considering putting my russian tortoise in there if there wouldn't be any conflict between the two(gotta do a bit more research on that topic if you have any info on that it'd be great.) The problem is that I live near sacramento, which is in the 90s and 100s in spring and summer but dips down to 30s, 40s, occasionally below 20. I just don't know how much time cooped up in a box that lizard could spend. I do not know if I should also purchase an indoor enclosure for fall/winter or build a large box, or maybe the iguana would be content in there, I really have zero idea. I came to this forum hoping for suggestions, if anybody knows how to build a very large heat room for the iguana that would be awesome. Maybe you have an idea of how to keep these guys outside like this, but I really do not know. Maybe you have information on what I should do. I really appreciate any and all suggestions and would like to state that I am doing my research before I purchase and would never keep the iguana outdoors if that mean't it would suffer, thank you everybody!