I hear what you guys are saying. As far as heating goes, we live in San Antonio, Texas. Heating is not a problem. I have a very large walk in closet in my bedroom, this houses my clothing, computer desk and now Sugar! This has a separate heating vent in the ceiling and is always the warmest room in the house and never needs another heat source. I guess I lucked out on that part! I am interested in the issue that was written about having enough light source. I leave the flourescent lights on in that room all day long. I understand that the top of this type of "cage" is solid, but this sides and back are mesh. This is a real light room. Do you still really think it would be a problem? I just wanted to get her something large that I could afford and put a nice flying saucer wheel, etc. in it. Also, I think since of its size maybe I could try to litter train her? What are your thoughts?