Spauld, what kind of environment do you live in? As in what is the coldest lows over a week, and do you get lots of snow, or freezing rain, strong winds, etc.
Most places, even when super cold, do not need to heat the coop. Now, electric for a light and to keep the water from freezing are kinda needed.....but not heat.
Most places, even when super cold, do not need to heat the coop. Now, electric for a light and to keep the water from freezing are kinda needed.....but not heat.