As long you provide your tortoise with a safe and warm place to live, and all his needs are met, it shouldn't matter whether you keep him inside or outside. Most of the negative comments are directed to people who think it is safe to let their tortoise wander the house. There are way too many dangers to allow that. A dedicated room or section of a room for your tortoise that is tortoise-safe should be fine. You have to be aware that even if your house is heated, it may be cooler on the floor where your tortoise is.Some of us have no choice, we love our tortoise & happen to live in northern Il, I have to believe a lot of people house for winter, so i'm asking for ideas, i'm thinking some day he gets his own bedroom
I had a dedicated room for a rabbit at one time, and the room got pretty much destroyed, so you should be prepared. It was a relief to be able to move him outside full-time.
Charlie lives outside in California full-time, but much of the winter he is inactive, unlike many other sulcatas mentioned on the forum. I don't know why. Even when he is kept warm; last winter he slept through the entire month of November and most of December in his heated night box.