I have a heating problem and question. Can anyone help?

[Paper Roses]

My 200 year old house is heated by oil except for an 'L', the Den, which has a Hydro-sil electric baseboard heater. The room is about 12 X 14 with a 7 foot ceiling.

Everything was fine until last year when I found it necessary to use an oil filled radiator to help keep the room warn. I tried to reach the Hydro-Sil company today for advice, or perhaps the replacement of the thermostat. It seems they went out of business in 2012. So much for a lifetime guarantee.

My question: I am planning to call a local propane gas provider, one that can hopefully install a room heater via propane as the energy source.I will ask for an estimate for a new room heater if they have the product to offer.

I have several free standing heaters on hand. Oil filled radiators, ceramic heaters and one that is a room heater with a fan. All of these heaters are 1500 watts. I don't know how to figure out how much any of these units cost to use as heat or as a supplement.

I also do not yet know how much it would cost to find some other source of heat for this room.
My heating costs are awful. I close the upstairs of my house off during the heating season. When I go to bed upstairs, the rooms are like ice. I keep my regular thermostat at 64 degrees and hope I can stand the cold.

Do any of you folks have trouble heating and have come up with a viable alternative for an electric 1 room heater?
My furnace and oil tanks are only 6 years old and I do not have any money to convert the system to gas.

The electric bills for Dec thru March are thru the roof and I am afraid of what this year will bring.
I live on SS and do not qualify for any assistance in the heating category.
I really would appreciate any advice you could give.
Thanks, PR