While that is true, their is an easy way of concentrating the heat into something with less mass, thus raising the temperature.
Basically a heat pump will use some addition energy and "add" heat to form something that is warmer than the original, but of less volume.
That is how residential geothermal heating works. (My house is heated with geothermal)
Water is sucked from my well at 10 C (50 F), the heat from that water is transferred to the water circulating to the radiators in the house. The water is then released into the environment at 4 C. Meanwhile, the water in the rad loop in my house is raised 20 c from 25c to 45 c. Since the temperature difference is 2.5 times the temp difference in the water from the well, for every 1 Litre of rad loop water heated, 2.5 litres of well water must be drawn.
This process uses about 3 kW @ peak, whereas to produce the same amount of heat with pure electric heat would take upwards of 10-15 kW.
So, for his computer the same thing could work. He would need a small heat pump, which could be salvaged from an old AC unit. (The compressor in an AC unit IS a heat pump).