We spent last winter in NYC, fulltime in our Travel Trailer.
Keeping the heat on, was enough for us. Didn't have any problem.
We did use alot of electric heat, but when we knew it was going to drop below 20 degrees, we used the LP furnace.
I know many people who simply used electric lights to keep the water bay warm. Just be smart and watch the weather...
"It's always wrong, everywhere, for anyone, to believe anything beyond insufficient evidence" -- William Kingdon Clifford
John (N9MXX) & Derek (KC9KEM)