Originally Posted by Deano56
I highly doubt that 87 has a basement with the tanks nicely tuck up in there. Mine has a heat duct where the water hookup is and the black and grey tanks have heating pads up on the bottoms of them. Never tried to see if they work
I dunno. I have an 88 Fleetwood Southwind with a full basement. Water compartment has a heat duct from furnace, and bulbs, but not separate heat built in.
Plumbing is under the cabinets, not inside them, and while all RVs are different, so are all RVers.
I am pretty comfortable in the 50s inside in the winter, but when not winterized, I do not set the furnace below 50 to 55. 60s are more comfortable, and when my family is with me, I would go to at least the mid 60s at night.
The risk of freezing, the decision of temperature comfort or fuel cost discomfort are very personal decisions that most have to make for themselves.
While the OP was asking for suggestions, I believe there are no single correct answers here. Ultimately, we all have to draw our own thresholds for cost vs comfort levels.
Good luck all. Have fun. Stay warm enough to be happy.