Properly installed electronics do produce considerable amounts of waste heat...
I built a high-performance computer in 2002 that required a heat-rejection capacity of just over 1 million BTU/h. It was "properly installed" and cruised at about 11 teraflops. Small change today. And equipment in the 1960s was not generally the low-power CMOS used in consumer electronics today, but instead power-hungry and heat-spewing TTL circuitry.
...try putting your hand on top of a CRT monitor or television that has been running for a while...
And imagine that there is no air to help cool it.
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