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I see. So it doesnt have something to do with which it better for fragnances storage?
The difference between TEC coolers and refrigerant based coolers would be the humidity inside of the cooler, not the temp. Unfortunately, I don’t know what humidity difference would be between the two but I think you would want a less humid environment if possible.
From my measurements, the humidity inside of my TEC cooler was around 45-50 percent relative humidity.