We winter camp in New Hampshire's White Mountains. We always have the roof vents open a bit, same with the bedroom windows, just a little open. Got to get some air circulation in the rv.
We also pull our bedding away from the headboard when the weekend is done for air circulation, same for the bunkhouse, although we don't have a bunkhouse anymore.
We dry clothes in a vented electric dryer, not wet clothes or towels in the camper. We don't boil water for pasta or create any steam cooking anything during the winter.