I have 6 birds - 2 barnyard mix, 1 EE, 1 Sapphire Gem, 1 delaware, 1 Cuckoo Maran. We live in Minnesota in the cities and wondering if I should insulate my 5x6 chicken coop? Some days in the winter it can fell like -40f and temperatures of -20. I will have a heat lamp in the coop during the winter. Click yes or no in the poll.
I live about 4 hours north of you, in Minnesota. The question of insulating the chicken coop is one I had to ponder when I first got my laying hens. Here are my thoughts after going through my second winter with my birds.
My chickens have survived just fine without any heat in the coop. Ventilation is very important to reduce humidity build up and frostbite. However, I discovered that our outside humidity in winter is quite high, and the coop humidity is also about the same. I have a remote weather sensor in the coop and compare my temp/humidity in the coop with the outside air. It should be within a few degrees or percentages either way. If the humidity in the coop is a lot higher than outside air, then you have a problem. Insulation will have little to no effect on humidity in an open air coop.
I only know of one person who heats his barn for his chickens. He breeds birds and has invested lots of money on his setup. So he has climate control year round. Most of us could not afford that type of setup.
In general, I would say that a heat lamp is not needed in a coop. Before I had any chickens, about 3 years ago, we had a stretch of cold weather where the temps stayed at about -40F for over a week. Lots of chicken owners around here lost birds to the extended cold over that long period of time. We had a run on those chicken panel heaters after that. I bought one myself, but have never used it. If you use a heat lamp, you need to secure it at least two different ways in case one fails. Heat lamps can cause fires if they get knocked down on the coop bedding.
I found that heated water is a must, at least for me. I have a metal fount waterer that sits on a metal heater base. That keeps my water ice free. As long as the chickens have fresh water to drink, they will eat, and stay alive. I suspect some people think they can just refresh the water a number of times per day, and not have to invest in water heaters. I think that an automatic base heater for the waterer was my best investment. I only have to refill my waterer about every 10 days. The water stays ice free 24/7, and the chickens can drink any time they want.
I have both my feeder and waterer inside my coop. My chickens will not go outside into the snow in the run for about 4 months out of the year. The heated water probably adds a little bit of heat and humidity to the coop, but it is insignificant when compared to outside temps. My coop is generally one or two degrees warmer than outside, and maybe a percentage lower in humidity. But I have two windows open for ventilation as well as two ridge top vents at the top of the roof line.
I built my coop about twice as big as recommended for chickens. I have almost 8 square feet per bird in my coop, compared to the recommended 4 square feet per bird. In Minnesota, in the winter, we need larger coops to provide more room for the chickens to get along socially and not peck each other to death in close quarters. They will spend a lot of time in the coop in winter. A larger coop also helps with humidity control and ventilation.
If you insulate your coop, then ask yourself what benefit you get from the insulation if you are leaving windows open to properly ventilate the coop? Insulated or not, your coop temps will be about the same as the outside temps if you have windows open and are ventilating properly. If your coop is drafty, then insulation may help seal up those cracks, but you still have to ensure proper ventilation.
Sorry for the long response to your short question, but I thought my local input on this topic might help you since we live in the same state. Winters can be tough on both the birds and their keepers here in Minnesota. So it's good you are asking for input and considering what you think might best for your setup. Best wishes.