I just got a new ARS 7030 rack (partially because my wife wanted the snakes moved to the basement) but I haven't started the new reptile room down there yet, I have to finish the kids new bedroom first. So I put the rack in the rat room and plugged in a heater. I have a digital thermometer with a probe hanging in the middle of the room and the temp there is about 75 - 78 deg. The rack is against an exterior wall though which I think is the problem. I have the rack probe taped to the heat panel and set at 102 deg. My readings in the tub on the hot side on top of the bedding (about an inch and a half of Cyprus mulch) is only 79 - 80 deg. After running all night. I haven't gotten far enough to check temps on the cold side. Any suggestions? I'm thinking I might need to get some king of insulation on the exterior walls in there.