Mr. Quint,
If you are going to be in that cold of weather, it's best to have your fresh water tank FULL. It will help in keeping the basement from freezing as that much water will be a 'heat sink' absorbing the cold.
I would think that a 20 amp connection will be enough for you to run the furnace fans. I also would imagine that you would put the fridge on propane.
Good luck,
MM.
Mr.Mark
2021.5 Pleasure Way Plateau FL Class-B on the Sprinter Chassis
2018 Mini Cooper Hardtop Coupe, 2 dr., 6-speed manual
(SOLD) 2015 Prevost Liberty Coach, 45 ft, 500 hp Volvo
(SOLD) 2008 Monaco Dynasty, 42 ft, 425 hp Cummins