Just convert to metric...1 C and it's not an issue (just kidding)
Where are you in Texas and is there anything stopping you from moving?
We are down in the RGV and our worst day is projected to be around 30F. Even up by Corpus Christie the worst is only around 23F for the worst low. (check the weather maps, it might make sense to head east or west rather than south)
As a full timer, my first choice would be to get to a warmer area.
Yes, 1F is challenging in an RV. If you can't move:
- Fill the Fresh Water tank and disconnect the hose.
- Assuming you are on a full hookup, drain the tanks and leave the valves open just before the first freeze. Try to limit water usage if you can as the waste hose will still freeze up.
- If the water system is in an underbelly compartment consider putting a work light with a 75w bulb inside (be careful that it doesn't rest against anything that could catch fire).
- Open the cabinet doors around any water pipes, so interior heat can get in.
- Fill the propane tanks and plan on where you are going to refill them (We got caught in -5F for a few days one year and we were going thru a 30lb tank per day...the park wound up restricting propane fills to park residents)
- If you have an electric heater, that can help. (during that time we were down to -5F, the furnace running full time and a space heater and we were still only up to the 50F's inside).
- If you don't already have it, go to home depot and pick up some reflectics (it's silver backed bubble wrap insulation). Then fit that to the windows and hatches to help trap heat.
Plan on a few miserable days.