What is the coldest it has ever gotten in your coop/s?
Not sure, probably just about -20F But I am not sure... I live out of town, up on a mountain, so my temps are lower than town, but I never have bothered with getting a reliable outdoor thermometer.
Do you ever provide any heat source for adults?
Never for adults... but I find if I stupidly hatch late season... my chicks need heat for maybe 2 months? Depending on outside temps, maybe even longer.
