We left Minnesota last January 13th for Florida. I did not put any fresh water in the tank or system until we got far enough south to be at least in the 20's regularly. You need to look in your manual and see what the recommended temp is that you can use the system in cold temps. We did stay in hotels at night for the first couple. We do have a heated wet bay in ours, but depending on wind and temps, you could get a freeze up. You will go through a lot of LP too trying to stay warm.
Marianne & Jerry
2016 Itasca Sunova 35G Honor Guard Fort Snelling Natl Cemetery, USS Decatur DDG-31 71-75