This may be a real dumb question but here goes...
I have heard this before but could not figure how it works.. You set your furnace to 40* so you can keep the basement warm and assist with electric.
If the temp in your trailer is kept to say 50-60* with electric heaters, when does the furnace come on to keep the basement warm?
We keep two 150watt light bulbs with aluminum reflectors to radiate heat, in the basement. This has helped when the temp has dropped to 24* outside. This year I plan to put an electric heater in the basement behind the wall set for 40*.
We have 3 Lasco Electric heaters. We normally use 1 in the bedroom and close the door at night. 2 in the living room/kitchen area.. Use heating tapes and insulation on the water hose. Normally disconnect the sewer hose until needing to drain them.
So far it has worked for us.
Also I found out something last year. The vent between the basement and inside of the trailer allows a lot of cold air to enter the trailer. Last year I felt a cold draft on the feet in the kitchen area and when I put a sheet of paper infront of the vent you could see the paper blow up quite aways as the cold air came into the trailer..
BC