Revisions log for Answer #2780
This is the answer to the question How do you prevent a stone pole in a conservatory from getting wet?
Revision 1
As long as the column is the coldest point and if I am interpreting it correctly, it is connected to the outside world, nothing helps except temperature compensation. Otherwise, moisture from the air will condense at that exact spot. Physics.
Heating can be accomplished in many different ways. A stream of warm air directed along the column may be sufficient.
Another option is to keep the air in the conservatory from falling below the dew point in the first place by heating the entire room. But that would probably be too expensive. Or to keep the air free of moisture altogether, i.e., keep the humidity very low. (Constant ventilation, dehumidifier)