[CherryBrandy]

I let mine drop to natural overnight heat in the house, sometime around 16 degrees even Egyptian. Central Heating can be so drying so even at cooler you need to be careful. They need humidity and heat, and cool end, and water. Outside in the spring, rule of thumb around 10 at night is ok to leave them outside (dry). Hope helped, but if worried a moonlight on a clamp will keep the are warm, though you will find they will go to the farthest corner away from it....! CB