[rohrmann]

Last year, we were in Missouri late, until early December, and experienced temps as low as 9 degrees, and had nothing freeze. We of course are full time and had the heat on, 65 to 68 degrees on the thermostat, and during the coldest days were going through a 7 gallon tank of propane in two days, but we were comfortable and so was the Montana. All we use in the black tank is deodorizer and Calgon, and occasionally a drain valve lubricant.