If I use propane to heat my house can I use same furnace and convert to electric

Not that I`ve ever heard of,, wait for others to answer,, thinking about it,, they might make some kind of conversion kit that would put a elect. Heating element into your plenium and the blower from your old furnace could blow across it,, don`t think it would be very efficient.

NO. The unit will not be listed or labeled for that usage and you home owners insurance will not cover in case of a fire..