Sorry, haven't tried the pipe in a coop thing... sounds interesting.
But yeah... I hate up high ventilation. (Unless you have not summers)
I like the ventilation right under the poop shelves.
I find that often when chickens get a 'cold' it is because there wasn't enough ventilation, it has nothing to do with the cold.
Often weight loss is not just from the cold, but a lack of light. They only eat when they have enough light, if the days are too short, they do not eat enough. Not...