This is the windblock that I put up on the west (prevailing wind) side of the run. The addition (with the blue tarp) has clear shower curtains wrapped around the west and north sides. (The blue tarp has been replaced with a much sturdier one.)
In November, I'll cover the arched window with furnace filter material. It's a white spun polyester, about 1/8" thick. The windows to the side have been removed and are covered with hardware cloth (so is the arch). I'll cover them with the filter material too.
Even though they're covered, the filter material still lets air through (or it wouldn't work for a furnace). It justs cuts down on the draft.
Until we get down to about 5-10F, I leave the people and pop doors open during the day. The run has a roof, so rain/snow don't blow in the coop doors.
When it gets to single digits, I'll close the people door. If it gets down to zero for a daytime temp, I close the pop door too.
I have a heavy duty, outdoor rated extension cord that runs from the garage to the run. I paid a whopping $5 extra to get one with 3 outlets. I have a heated dog water bowl to keep water in the run liquid. I have a string of white Christmas lights in the run to brighten it up.
When it gets cold enough to close the pop and people doors, I put a pan of snow in the coop for the birds to eat in place of water. I don't want water in the coop; it just adds moisture to the air and gets spilled. Excess moisture in the air leads to frostbite.