Quote Originally Posted by ralphdp21 View Post
Thank you for the heads up but I think you may have it backwards. The probe should be "OUT" when I move the rheostat setting the "OUT" starts to change.

Please some one double check on that, but I don't see the "IN" temperature change when I alter the rheostat, only the "OUT".
Correct, "OUT" = outside, measured by the probe. "IN"/inside is measured by the unit itself (which is assumed to be inside).