I live in Iowa and we often get below 0 as well. My snake room in the basement and in the winter time I keep a space heater in there to keep it around 73 degrees, higher if it's not so cold outside. I also keep hand warmers stocked just in case there is a power outage. We had a short power outage last year and I threw some hand warmers under the tubs and draped several blankets over the rack to help hold the heat in.
BTW you don't really have to worry about day light by using a heat lamp. Unless you need the heat lamp for heat I suggest not using it. Heat lamps cause all sorts of humidity issues and it's just easier not to use it if you have UTH. In my experience BPs don't need the sunlight. My basement is dark and this winter I'm covering the windows with insulation. There isn't much light that gets in from the windows currently, and the racks make it even harder for light to reach the BPs. I haven't had any issues with my BPs, but maybe that's why my snakes will eat any time of day! lol
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