Title says it all. We have 10 standard chickens and 6 Class A&B Seramas in a mixed flock. We live in northeastern Ohio and have cold winters. We are first time chicken keepers and are trying our best to do things correctly with researching on the internet. In our coop we had a heat lamp and heat pad. Tragically our coop burnt down Thursday morning. Thankfully all our chickens were out of the coop and unharmed. We have since purchased and placed a new 10'x12' shed. We cut a 9"×11" hole for a chicken door into the run. The shed is completely empty. We placed wooden crates in as nest boxes, put about 7 inches of straw down and pine wood shaves in boxes, and purchased new feeders and waterers. My husband and I both own our own businesses and with the coop fire we are very behind. We want to make the coop perfect and would like to only put in the necessities until spring. The temperatures are dropping very low this week and next week. Our chickens huddled in one corner basically on top of each other this evening. I know we need to find a solution for a roost. What else can we do immediately to help keep them warm? I know everyone has an opinion on heat or no heat, but with seramas and negative temperatures coming I feel like we need something. What supplemental heat options are safe for that big of a space? Is the hole for the chicken door okay uncovered all night or do we have to purchase an automatic door? Our chickens are located at my inlaws so I cant be there morning and night to open and close it. The run has poultry netting over it so the coop and run are enclosed. We are desperate to do the right things. I'm so worried my chickens are freezing. We are pressed for time and need quick solutions/necessities. Pictures of new shed attached. Any and all suggestions appreciated.