You'll want to look into "Open Air Coops" then.
Heat is a much bigger concern than cold for chickens and the more fresh air they have year round the better.
Hello and welcome to BYC. Good for you doing your research and making your plans before you get the chickens.
The coop is the henhouse -- the enclosed and predator-proof structure where they can be shut up safely at night and during times that you do not want them out for whatever reason...