I just wanted to share what I do. I have a large or x-large crate (used for my Golden Retriever) and I sit it in an x-pen with the crate door open. I cover the crate and make it a private area. I find that since it is so large I can get in there if I need to. Also, I line the sides with cardboard or thin paneling so the puppies will not get stuck between the bars on the crate. I have a spare room, (computer room) and I shut off all the vents so there is no blowing air. I then bought a register type electric heater with a thermastat to warm the room. Emilee was able to go from the crate out into the x-pen to potty on pads and to eat. I also didn't have to worry about Emilee or the puppies getting too hot and not being able to get away from the heat as with a heating pad. The whole situation worked perfectly for us.