For processes, which are spontaneous at high temperature or spontaneous at low temperatures, there is a specific temperature where the transition to spontaneous is made.
The reaction starts to become spontaneous when G = 0
So using the equation: G = H - TS and setting G = 0
0 = H - TS
Or
TS = H
T = H/S
This video contains an example problem, which calculates the temperature at which a reaction becomes spontaneous.

Here is an index of the other videos in Chapter 22 Gibbs Free Energy:
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Here is an index of the entire Video Textbook of Chemistry:
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