We have not turned the heat on yet and the place is about 62-65. The bedroom is a lot cooler as I keep a window open as long as I can. General Lee sleeps under the electric blanket with us. During the day while he is alone in an X-pen I keep a pillow and his kennel with a sheet and a blanket. So far so good. He is 11 pounds and only seems to show cold in his ears. Sometimes when we are outside he will shiver, but does not want to come in... very much like a child.