Well, it was my first winter with chickens 
Just to put you in context, this year was abnormally cold. Most of january and february was -30C. It was really a harsh winter.
BUT, I read the threads and decided to go without supplemental heating. I tried to use the deep litter method. The little tips of the rooster's comb have frozen, but nothing major at all.
I have 6 hens and a rooster, in a 12*8 foot insulated coop. It's painted in dark green - if that helps, and also has windows that let the sunshine inside during the day.
The only thing I bought was a heated water bowl as it was impossible to manage otherwise.
The egg production stopped around mid-december but now it's back on track for the last week!
Amazing. They were laying 1-2 eggs per 2-3 days during end of february. Suddenly, last wednesday they all layed one and since then, they are all laying one egg per day!
I also shoveled the snow in a little part of the lawn so I can carry the chickens to that place and they can eat a bit of grass lol. They won't step on the snow, little precious ones.
So overall - yes, they can be kept without heat! And yes they survive and look happy. It can be done

Just to put you in context, this year was abnormally cold. Most of january and february was -30C. It was really a harsh winter.
BUT, I read the threads and decided to go without supplemental heating. I tried to use the deep litter method. The little tips of the rooster's comb have frozen, but nothing major at all.
I have 6 hens and a rooster, in a 12*8 foot insulated coop. It's painted in dark green - if that helps, and also has windows that let the sunshine inside during the day.
The only thing I bought was a heated water bowl as it was impossible to manage otherwise.
The egg production stopped around mid-december but now it's back on track for the last week!
Amazing. They were laying 1-2 eggs per 2-3 days during end of february. Suddenly, last wednesday they all layed one and since then, they are all laying one egg per day!
I also shoveled the snow in a little part of the lawn so I can carry the chickens to that place and they can eat a bit of grass lol. They won't step on the snow, little precious ones.
So overall - yes, they can be kept without heat! And yes they survive and look happy. It can be done
