Thanks for the info and heads up on the water pump. I'll look into the bulb in the water compartment as the pump is on that outside plastic wall.
I also rarely use the second furnace except try to force it on some to give it some exercise.
I would like to find some insulating material I can install underneath like around the water compartment and also on the outside of the entrance steps as that seems to be the coldest area of my Horizon. I have an infrared thermometer and the step temps are at least 10 degrees colder than anywhere else in the coach. When I looked underneath it looks like just the metal steps and then the vinyl inside. I would like something with a durable outside skin.
Any ideas?? Any one?