t I used a transparent tarp like the greenhouse kits are made out of. The fountain heater is still in good shape, I set it on top of two flat concrete blocks (2"x8"x16") just to keep the birds from snuggling up to the heater, and keep it from getting wet. The heater I bought is a self contained, galvanized, 16" unit with a heavy duty 110VDC cord that is about3' long, definitely enough to run out of the hoop house. I left vent strips open at each end (it is 6' tall, 8' wide at bottom, and 13' long) so it is not overly hot, but it is close to 50○ inside during a cold day, and drops down to 30○ at night. The Fountain is thawed out all times as the heater does not kick on till it gets to 32○, and since it is just transferring heat directly to the fountain, the birds never do get burned. Chickens are happy, I am happy, the Fountain was about $50.00 at Tractor Supply Center, and I am using a 6 gallon fountain which was about $24.00 two years ago. Bathroom stays chicken-free, wife is happy. Every one is Happy, Happy, Happy!…