just a thought! A Dietz #80 cold blast hurricane lamp puts out 1,400 BTU. If electricity not available, and there is a safe location to hang one or two, as I said in another post. It will take the frost off the pumpkin. It would also control humidity. When I lived on a boat, two kept it warm, one kept it dry. It is low tech, has its negatives but it works. You still can find kerosene at some filling stations. Trim wick and control the flame, the carbon out put should not be a problem. My grandmothers coop had ample ventilation. If you have a tight coop it would be not a good idea.