I just purchased a zoo-med repti therm uth and installed it per instructions with a zoo-med repti-temp rheostat (which is set at the lowest setting). On the warm side I have got the temp to a constant 92 degrees on top of the bedding and it is 98 degrees at the very bottom (approx 3 inches of bedding) so I believe that is okay. On the cool side though my temp is at 89 degrees because of the CHE lamp but without it is dropping down to 78 degrees. Does anyone have any suggestions as to what I can do to fix this. I am using a digital gauge to check the temos and also have a Flukers thermo-hygrometer. My ambiant temp is at 86 degrees. Any help would be appreciated. (BTW it is a 10 gallon glass tank that is being used)

Thanks,

Maria