I brumate my group of Russians in an old night box I had for them. It is fully insulated and in a corner of my yard that gets no sun. I maintain a min temp with an oil filled radiant heater on a thermostat. I can hear the box, I cannot cool it. Our winter has been very unusual. Normally Dec through Feb we rarely see high temps much above freezing, so it works well. This year we are already getting into the 40's. Close to 50 next week. The last couple of days their temp is getting to 45 or so. I checked them, everyone is still sleeping, but my worry is they are burning too much energy. I will be monitoring weight starting next month, but unsure how to know if they need to come out. They went in Dec 1st, so only 8, 9 weeks ago. What temps do you all find to be too high?