It's very difficult to get to the coils on the front but from the back, there is no temperature difference between the two copper pipes into and out of the compressor. The in pipe is a little warmer than ambient, probably conduction from the hot compressor body. The out pipe (insulated) is the same temp (under the insulation) as the ambient temp of the dehumidifier's case. All measured with an IR remote thermometer.
By 'finger test' from the back of the unit, the top coil and the bottom coil are the same temp.
P.S., I can hear the compressor start up after the fan starts when I turn it on.
Hope that helps.