Our Hearthstone will go to 800-900 deg. on the flue gas temperature with a full load for the night, with the air control closed all the way. the secondary combustion will really be rolling for the fist 1-2 hours then it settles down. If it's 75 in the stove room within an hour it will be up around 80 deg. So when I load for the night it is definitely time to head to the back bedroom.