Not really sure I understand the question...
From the manual:
Note: Negative temperature compensation ratios indicate that your focuser will move INWARD as temperature drops.
Since temperature drops are, by far the most commonly observed chage, we used this to standard user input on... If you enter "-7", your focuser will move inward by 7 steps when temperature drops by seven degrees. Most people associate inward movement with smaller (or in this case negative numbers). Conversely, this same entry would result in outward movement of 7 steps if temperature increased by one degree.