No sun in the room I do have a air purifier and space heater in the room but not blowing directly on the enclosure.. Yea I found it odd too.. That side tends to stay a little warmer then the other too.. Herpstat 4 set to 90 for flexwatt and 84 and 84 for the 40w rhps which the right side seems to average 82-86 and the other side is 80-81 under the panels and snake level. I'm going to try to drop the heat on that side to 82.5 and see if that helps. Both sides are identical except the one on left has more hides and such cuz she's only about 100g and my normal is probably 350g now