I am needing advice. I was given a +50lb sulcata tortoise that needed to be rehomed last January. Of course being the first sulcata that size that I have had, I did not have his outdoor enclosure built so he was in the house until spring. I have now built a building with an oil radiated heater and heated floor mat. I have a camera mounted inside and a temperature gauge that can be monitored from inside. Now that its starting to get cold out, I have been keeping a close eye on the temps. So far the lowest the air temp has gotten down to 57 degrees. Now the gauge is not at tortoise level (he kept knocking it off) and is not catching the heat from the flooring. I have a temperature gun that tells me the floor is staying around 70-75 degrees and the heater is putting off over 200 degrees. My question is, how cold is too cold for the house to get?? It's insulated and usually keeps the temperature 20 degrees warmer than outside. I just want to make sure he is fine. I can bring him in the house but I keep my house cooler than his house has been. He seems ok but I don't want to risk anything. Any advice would be greatly appreciated.