Quote Originally Posted by lisa77
Sorry..

The mat stat is set at 87F but the temp at the hot end is only reaching 75F.

I dont use the mat for the cool side.. I use it to cover / 1/2 of the underside of the tub.

Shall I cover half of the underside of the tub?
You should be aiming for higher temps to begin with. 92F or thereabouts. How is the mat attached to the enclosure? And how much substrate are you trying to heat through?