Foundation insulation is a good idea to consider....we are planning on building a house next spring, and have been talking to several builders - especially when it comes to looking at insulation and efficiency..anyway, the largest payoff that most builders have discovered has been in adding insulation under the concrete foundation. I would think that the same would apply to building a chicken coop - even if not having a concrete floor, but a wooden one. Add insulation in the floor and there would probably huge benefits for the chickens....some extra costs, but they might be worth it.
