It's not cold because the temperature hasn't dropped yet.
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The location of the host should be placed in the position of ventilation space as far as possible. Do not place other objects on the chassis, especially the heat dissipation holes in the chassis. Of course, if the room is installed with air conditioning, when using the computer, try to lower the temperature of the air conditioning, if the shutdown can be adjusted back.
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In principle, the semiconductor refrigeration sheet is a heat transfer tool. When a current passes through a thermocouple pair formed by a N-type semiconductor material and a P-type semiconductor material, heat transfer will occur between the two ends, and heat will be transferred from one end to the other end, resulting in a temperature difference to form a hot and cold end.