I am wondering if this ceramic panel would be enough for me: http://www.amazon.com/gp/product/B0..._m=ATVPDKIKX0DER&pf_rd_r=19VMBTM8DEPM823XVY04 But I have no idea how to calculate the heat it will emit. I was wondering if anyone could share their ceramic panel setups? Like the size of coop, lowest winter temperature and number of watts of the ceramic panel. My coop is 12 X 8 feet, 5 feet high. Our coldest times are around -35C or -31F. It is insulated with 1 inch (or 1.5??) blue styrofoam boards. I have 6 chickens in the winter time (I think they will generate 60 watt of heat if I remember properly). I do understand that chickens don't need to be as warm as we do in winter. But I do have a job, and sometimes I go for a beer after work I would like to know that I don't need to rush home and take water to the coop because it froze up a few hours ago, so my goal is just to maintain a temperature around freezing point or a little less.