We've been running our new Hampton i300 for about a week now. We were initially concerned that we wouldn't get much heat into the upstairs bedroom without leaving the door open. That did not prove to be the case. When we first bought the house (a bit over 4 years ago), we gutted the master bedroom and added insulation to the outside walls and new sheet rock. We decided not to cover the brick chimney that ran through one corner of the room because we like the detail provided by the column of exposed brick. That exposed brick chimney is now serving very nicely as a radiant heater and keeping the bedroom warm and cozy.