Do you have a heat jacket on the stove? Usually it's get hooked to the cold air return so It can pull the heat from the stove and into the house using the furnace fan. However, most furnace blowers are Too powerful for the small STOVES, and it will just pull cooler air.
Also, these are stoves, not furnaces.
Whats your current furnace BTU rating?
Post a pic or two of your setup and then maybe we can see what you are working with.