Annabelle wrote:I notice when the coal furnace is running that the chimney is quite warm and it seems to me more heat is going up the chimney then what is coming into the house.
That may very well be your problem. Get a stick on (magnetic) thermometer for the stovepipe, you need that to know what is going on. How tall is your chimney above the coal furnace? The baro will also need to be set properly.
Just for a test, lift the baro's flapper and stick something in it to hold it open about an inch or two and wait about an hour. If the heat in the furnace goes up a bunch, that is the problem, the heat is going up the chimney and not heating the house. Do not leave it like that unattended however, get someone to set the baro with a meter.