I have a 12'x10' chicken coop on a concrete slab. My hubby and I insulated the walls this weekend, but he think since the eaves are open (screened in for ventilation) that it isn't enough to keep the coop above freezing. I really just want it warm enough that my eggs won't freeze. I bought a floating heater for their water bucket. Is this enough? btw, we used rolled insulation with waferboard plywood to cover.