New owner of a Jotul Rockland C550 insert. I have a center hall colonial that is about 1800 sq ft. Insert in the LR. LR has two entrances that face center hall. One entrance faces the Kitchen, the other the DR. DR has the house thermostat. After burning for several hours this evening the thermostat only went from 55 degrees to 60 degrees. Im confused. Ive been reading so many people have their houses at 70+. I also slide the air control back about half way after the fire really gets going. Am I doing something wrong? I would appreciate any advice.