The rule of thumb is to put a convection heater under the largest heat
leak/cooled surface. Simple logic shows that this can lead to zero convection
from the cold source with minimal heat input. Therefore that's the most
efficient place to put the heater. Comfort is another thing. For confort there
will be additional smaller heaters in the room if it is large. Typically a steam
pipe or hot water running at the base (again) of the walls around the room/hall.

But without canceling the cold convection from the major heat leaks there will
always be a cold 'draft' somewhere.

Peter P.


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