The power listed is likely the start-up power requirements. One thing to bear in mind regarding phase-change systems is that the cooling power produced is much higher than the energy consumed by the compressor. A lot of the cooling energy comes from the radiator in the circuit.
Refrigerators typically have what is called a "coefficient of performance" or similar. It is a measure of the cooling power produced vs the power input to the system. Depending on the refrigerant, delta-T from ambient air to expanded gas, and compressor efficiency, this number may be higher than ten.
What all this means is that to cool 100 watts in a continuous fashion, the electrical power to the compressor would be ~10 watts. The remaining 90 watts gets handled by ambient air blowing over the radiator. Now compressors take way more than 10 watts, but that's why the "on" time is so short in the examples listed above. If you averaged out the compressor power to an equivalent continuous usage, it would be much less than the power input from the CPU.
I have no idea how efficient dehumidifier compressors are, but would expect a minimum of 5:1 cooling:compressor electricity. Fans blowing on radiators add to the electric bill, too, but aren't so bad.
All that said, the best bet is to find out what compressor sits inside that thing. Good chance it's a Copeland, for which you can get data direct from the manufacturer.
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