I purchased the "Producer's Pride Brooder and Coop Heater" (https://www.tractorsupply.com/tsc/product/producers-pride-brooder-and-coop-heater) to use as a brooder when I first got my Wyandotte chicks last spring. It is now fall in Wisconsin and the temperatures are beginning to drop. Though I don't expect to heat my coop regularly during the winter, I do want to have a heating plan in place for the exceptionally cold days (0, -10s, -20s). While the Producer's Pride Brooder is marketed as a coop heater as well, I wonder if anyone has experience using this heating plate in such cold temperatures. Will it make the cut? Or is -20 simply too cold for this heating plate to properly function in the coop? Thanks in advance for your help!