Nice to see all the "Room Temp" users... If you get the temp probe dialed in (in the right place) this setting really takes advantage of all the wizardry we paid for when buying a Harman... When it's below 30, unless your house is wickedly well insulated, having it in auto or manual shouldn't make a bit of difference since the stove shouldn't shut down anyway. Below 30 your house will always be loosing heat at a pretty good pace so the maintenance burn will allow the stove to bleed some heat into the room in advance of a call for heat. The only reason Room Temp auto could be a benefit is if you have a power loss and the stove goes cold. Will fire back up once power is restored.