A vehicle comprising: an outer wall; an insulation layer that extends along the outer wall; a gap formed between the outer wall and the insulation layer, a cabin area formed within the insulation layer at a center of the vehicle; and a system to passively remove moisture from air within the vehicle, the system comprising: a first duct that extends through the insulation layer, the first duct comprising an inlet positioned in the cabin area of the vehicle and an outlet positioned in the gap formed between the outer wall and the insulation layer; a second duct that extends through the insulation layer, the second duct comprising an inlet positioned in the gap and an outlet positioned in the cabin area; wherein: the second duct is positioned in the vehicle vertically below the first duct; the inlet (21, 31) and the outlet (22, 32) of each of the first and second ducts (20, 30) are open and unattached to an air moving device; and the first and second ducts (20, 30) are positioned for enabling air within the vehicle to passively move through the first duct and into the gap, move downward through the gap where moisture in the air freezes against the outer wall, and move out of the second duct and back into cabin area, wherein the first duct has a smaller minimum cross-sectional area than the second duct. an outer wall; an insulation layer that extends along the outer wall; a gap formed between the outer wall and the insulation layer, a cabin area formed within the insulation layer at a center of the vehicle; and a system to passively remove moisture from air within the vehicle, the system comprising: a first duct that extends through the insulation layer, the first duct comprising an inlet positioned in the cabin area of the vehicle and an outlet positioned in the gap formed between the outer wall and the insulation layer; a second duct that extends through the insulation layer, the second duct comprising an inlet positioned in the gap and an outlet positioned in the cabin area; wherein: the second duct is positioned in the vehicle vertically below the first duct; the inlet (21, 31) and the outlet (22, 32) of each of the first and second ducts (20, 30) are open and unattached to an air moving device; and the first and second ducts (20, 30) are positioned for enabling air within the vehicle to passively move through the first duct and into the gap, move downward through the gap where moisture in the air freezes against the outer wall, and move out of the second duct and back into cabin area, a first duct that extends through the insulation layer, the first duct comprising an inlet positioned in the cabin area of the vehicle and an outlet positioned in the gap formed between the outer wall and the insulation layer; a second duct that extends through the insulation layer, the second duct comprising an inlet positioned in the gap and an outlet positioned in the cabin area; wherein: the second duct is positioned in the vehicle vertically below the first duct; the inlet (21, 31) and the outlet (22, 32) of each of the first and second ducts (20, 30) are open and unattached to an air moving device; and the first and second ducts (20, 30) are positioned for enabling air within the vehicle to passively move through the first duct and into the gap, move downward through the gap where moisture in the air freezes against the outer wall, and move out of the second duct and back into cabin area, the second duct is positioned in the vehicle vertically below the first duct; the inlet (21, 31) and the outlet (22, 32) of each of the first and second ducts (20, 30) are open and unattached to an air moving device; and the first and second ducts (20, 30) are positioned for enabling air within the vehicle to passively move through the first duct and into the gap, move downward through the gap where moisture in the air freezes against the outer wall, and move out of the second duct and back into cabin area, wherein the first duct has a smaller minimum cross-sectional area than the second duct.