Aoxa, just found this thread. Your new barn plan is AMAZING!!! I love that you are using the metal sheathing on the outside. A lot of buildings use this here in Texas, and they look great. Just wash it off once a year and it will look like new. Also, I just adore Henry!
As for heat in the brooder room, did you say somewhere that there will be a water heater in the barn? And that the brooder section will have a concrete floor? Have you thought of radiant floor heating, with hot water from the water heater run through coils of PEX plastic pipe embedded in the concrete floor? You could even run it under a raised wooden floor. It would be perfectly safe, and the warmest part would be near the floor where the brooders are. I know there are websites with information on using your water heater to do this, instead of having to use a boiler. Since this is for a barn, and not your house, I would think this would work and there would be NO risk of fire. PEX pipe is fairly inexpensive and easy to work with. My dad and I used it for the water supply lines in the addition we are building onto our house, and we did all the work ourselves. Check out
www.radiantec.com for information on putting in this type of heat using your water heater as a source for the hot water.
I will be keeping an eye on this thread from now on, watching your progress. Keep up the good work!!