As a medium in traditional culture, I doubt there will be much issue with temperature. In S/H culture, I would guess there would be more of an issue.
My guess at the scenario: a little bit of evaporating water has a little bit of cooling effect. Once the water content of the medium decreases, the cooling effect does, as well.
In semi-hydroponics, the water content in the medium doesn't decrease, so the evaporative cooling effect continues, making the medium cooler. There is a moderating effect, of course, as the cooler temperature slows evaporation.
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