I live in a medium-sized airy house whose bedrooms are all in the main part of the house, with the exception of one bedroom which is above the unheated garage. This room gets quite cold even in the autumn, and has an electric heater that we use along with lots of blankets.
The living room at the opposite end of the house has a large fireplace which is able to keep most of the rooms warm just by keeping the doors open, but the room over the garage is quite isolated and is accessed via a few corridors - the warmth doesn't get that far (the ceilings are higher than the tops of the doors, so heat gets stuck).
What options are there for warming this room?
Ideally we should use the fireplace, but I am not sure how. Some relatives (a long time ago, in another house) used to put a brick in/near the fire and then place that in their bed - is there something similar that could achieve the same safely today?
I have also seen tea candles (the small circular candles used for keeping plates warm in some restaurants) under upturned ceramic pots being used for heating but I'm not sure if the air in the room becomes dirty this approach.
edit: while ducting is possible, it's not very appealing aesthetically.