The answer to your question is yes! That's just the way it is in Colorado. If its going to be just a week or so I will setup the coach furnace with supplemental electric heat and make do for a week or so. Otherwise I drain the tanks and will pump in the RV anti-freeze.
It takes less than 2 gallons of RV anti-freeze. Time is mostly in draining the tanks. My pump has a tap for pumping in the RV anti-freeze. Our rig has an instant demand water heater so no need to by pass or drain (we do not like the instant demand water hearter but that is another subject).
Good Luck.
Rick
