The best thing you can do is to check out and test your mobile home furnace heating system before you actually need to use it. With winter now approaching it is time to make sure that everything will work properly when the time comes to turn it on and not at the last minute.
Doing the proper maintenance to the system which involves things such as changing the filter and other recommendations I point out on my website page about electric furnace preparation, testing and how to trouble shoot problems. I even have some excellent resources for any needed parts or filters.
I do recommend that you seek professional service if you don't have some background or technical understanding of heating and cooling systems.
While you are at it test and or install smoke detectors at this time for safety's sake.
Staying warm cheaper can be done by following a few simple guidelines.