Welcome to BYC!
You might want to put a few more 2x4's under that plastic on the roof.
You can add your location to your profile.
It's easy to do, then it's always there!
Close lower windows.
Add heater to waterer.
Close upper windows.
Toss cardboard on mesh ceiling over roost to block drafts/blowing snow from eave vents.
Snow shovel out for parts of mesh roofed run(both ground and roof).