Heating the whole street

Well, not quite... When I left to head over to Tori's I mistakenly left the door between the entrance lobby and the hallway open. The lobby is unheated so all the cold air was free to mingle in the house.

When I got home 3 hours later the heating had done a good job; the downstairs temperature was still on target. But upstairs... that was a good 8F warmer than before. A little warm!