First off, I live in southern Colorado, highs are about to 50, lows down to 30. They are in an oversized shed we call our shop, which tends to stay a little warmer than the outside most of the time. They seem to be doing well with the heat lamp, but that, as I originally said, uses too much electicity to run all night.
Our plan is this: We will put them in a box with extra insulation with shavings over it, take it into the house(doesn't get below 60 inside, usually over 65), put a bottle of hot water in each corner covered with a work glove, and then put a heating pad(on medium heat) under the box.
What do you guys think?
Also, thank you for replying!