So I have 14 chickens and winter came early this yr. I live in the Central ny area, up in the Adirondacks and get tons of lake effect snow. Last night it went down to - 5°F and the coop was 0°F. Is this too cold for my peeps? For reference our coop is 8 by 6ft, lifted 2ft above ground, and made of plywood. 3 of the walls r insulated while one is not (we ran out of insulation). We plastic wrapped our run with thick plastic from Lowes. We tried putting in a heat lamp, last night it didn't do much. How cold, is too cold for them? We have 1 girls which r ISA Browns and 3 boys which r Belgian D'Uccles, so they r winter hardy.