A bit of background. My coop is 10x16 with stick built construction. It is not insulated and I'm using aluminum storm windows with self storing screens. I have two vents at the peak and the soffit is a vented variety. I'm doing a 6" deep litter method starting in October. I have brown pullets, white Cornish rocks and black austrolop breeds totaling 17 birds.The coop has an auto humidistat in it that runs a small 4" vent fan that blows out a vent pipe to the outside if the humidity level gets above 65%. The return line from my house and garage for my outdoor wood boiler is on the other side of the wall. I was going to run a small 5-6' section of the 1" pex pipe under one set of the three roosts I have in the coop. As long as there are 2 other unheated roosts am I causing more harm than good? I'm not worried about the extra cost in firewood as I have enough for 3-4 years. I'm also not worried if the power goes out as I have a generator that runs the whole house and garage.