After re-reading my post I realized I didn't specify I meant the temps in my apartment outside the cage which can go below 72 especially during winter.It's hard for me to calculate because outside of him being a hybrid I don't know the difference in temperature between the areas of Sumatra where Blacks and Reds live.I guess my question would be what temperature level would be a danger degree.From what I understand they are Nocturnal.Does anyone know the average temp during the snakes active period?