Switching from tubs to rack

[Eric00]

I just set up an Iris sweater box from Reptile Basics with a Herpstat 2 today, and it is set at 91, and is giving me a consistent hot spot of 90. I am brand new to this whole tub system, so hopefully someone with some more knowledge can help you out.

How long did you have it setup before getting a your needed temp? I bumped it up to 100 degrees on thermostat and still not getting much over 80 degrees in the tubs