I installed a new Vermont Castings Winterwarm insert last fall. I probably would of known better if I had found this website prior to my purchase. This unit doesn't produce enough heat. It won't warm the room where the insert is located. Would a larger insert produce more heat or do I need to install a wood burning stove? The room is close to 1000 sq ft. and there is an open stairway fairly close to the insert. I seem to be spending alot of time splitting wood, and I am not keeping warm.