Oh, okay. In the winter (what few days of winter we get) we can keep it in the 60s in the house. I don't think it's ever dropped below 60 unless the power went off. I'll use a CHE on my greens and maybe on Sebastian this year since he is so young, but I don't generally use a CHE on Kismet except for the one of two nights a year where it drops into the 20s outside and I worry about the room being too cold.