It doesn't really matter how cute your new chicken coop is.
What matters (especially in the winter) is good ventilation!!!
As birds exhale they also emit moisture and their droppings emit moisture. This moisture will condense on your chickens and cause frostbitten combs, frozen toes and respiratory problems.
You need air FLOW (as in cross ventilation - one window will not do it) flushing out the hot wet air coming off your chickens and their droppings. Dry bedding is a lot better than wet bedding.
Chickens are 107 degrees - they can take it extremely cold (think of a little chickadee standing in the snow barefoot) plus they're covered with down and feathers. It's the moisture that gets them.
Plus good ventilation discourages mites, especially in the humid summer.
Here are some pics of coops with good ventilation.
DO NOT BUY YOUR CHICKENS A DEATH TRAP!!!
And DO keep in mind, you can always cut out some vents - but cover them with hardware cloth NOT chicken wire, predators CAN and WILL get through chicken wire.
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