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Increase air flow .
Around or inside the box.
The higher the volume of air moving through, the less the air will be able to heat up, the less the margin between that room's air and the rest of the house.
Also keep airflow with that room and the rest of the house in mind. Keep the door or a small window open.
I guarantee that pc is taking in and pushing air out the same side or is hemmed in by a table and restricted in airflow that way. Right?
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