[rohrmann]

Some years ago we were in those temps north of KC, and we would run through a 7 gallon cylinder of propane in two days. So, two cylinders would last four days. We had park power, so the water heater and the fridge run on electric and the batteries were kept charged. We also got an electric hose before the temps got that cold, so the water hose never froze either. If you aren't connected to power, your batteries won't last three days running the furnace. We never had anything freeze doing this.