Quote Originally Posted by Theely View Post
Under the carpet directly on the glass I can get a reading of 100 yet sitting on top of the carpet its perfect (90-92) and the cool side is at 78 and slowly climbing. 100watt infrared over the warm side, 60 over the cool.
How are you measuring both temperatures (on top of the carpet and under it) at the same time?
I just think you should measure the surface temp with your top on long enough to make sure that temp has evened out (so using both probes or using a temp gun) just because the surface temp is a lot more likely to vary with the top off than the glass temp

If you were doing it like that, then it sounds like you want it to read about 100, but I would check that over time too, as that might change with the weather. (or maybe you'll want to get another type of substrate hehe)