What I have learned about cold weather camping . . . . .

Sounds like typical Oct to May camping around here, we just spent a week on the wet-coast with temps like those and humidity near 100% every day

Opening a window, only if you want to "let" even more humidity in

De-Humidifier, yup it runs all winter, even when we are not using the rig

We made certain the rig had thermal-pane by ordering it that way

Still had some condensation on the inside of the window frames

(two people, two dogs, two cats)