We reside in the Pacific NW - where the average temps are in the mid-30's to low 40's during the winter months, but it rains a lot.
We just bought one coop (4x3) / run (4x12) combo off of Craigslist with the coop up off the ground by approx 2.5 feet and a floor entrance, a plexiglass window, and red heat lamp and regular lightbulb. Not the best built, but very functional! Part of the run (which is mostly chicken wire) has see-through corrugated roofing on top and is up on hinges so we can have access to put food bowls and water bowls there out of the elements. There are about 3/4" gaps along all of the lower roof line for venting and the roof is plywood with asphalt shingles.
We're also building another coop (4x4) / run (4x8) almost like a chicken tractor - with see-through corrugated roofing (for all the natural light) across the whole length of the coop and run. I know we'll lose more heat in the coop with just this type of roofing, but I don't want the coop all dark during what little daylight hours we have running electricity 24/7. If the winter proves to be too cold this year, we'll go ahead and add plywood with asphalt in it's place. Relatively easy switch... We have 1/2" wire mesh along the front half of the roof line for venting and about 1/4" gaps on the lower roof line to help circulate.
This coop will be up on hand-truck wheels so we can move it about our pasture for the girls to "graze". No regular chicken wire here! We're using 1/2" and 1/4" hardware cloth all around to keep predators at bay. We have 3/4" plywood for the walls and floor of the coop, deciding on a floor entrance as opposed to the side entrance with the floor ladder having the capability of slotting into place to seal it up when we need to, but most of the time it will remain open for them to have access to the run. We're just planning to set up a regular old lightbulb on a timer for a light source during the winter months and using a ceramic bulb to keep the coop warm when the lights off. All electrical will be up high under the roof line for protection from the elements...
Not sure what I'm going to do with the water bowls for either coop just yet. Will either take warm water down each morning or utilize a heated bowl. Definitely will keep a really thick layer of straw on the floors for added insulation.