I agree with Glenn on avoiding the plastic bag. We moved from Seattle to a place 2 1/2 hrs. SW, and overnight saw husband's tools dripping water in the roll about tool chests, well above the floor. He was busy plugging holes where wind was blowing through the attached garage. We put a small portable oil-filled radiator heater in there and hauled up an old de-humidifier from the basement. That de-humidifier was old when we moved here and it is still working 10 years later. The heater and de-humidifier do not work nearly as hard or often now that most of the cold air is blocked.