Are you getting the noise through your speakers when the heater/AC is running or is it the heater/AC that is actually emitting the noise?
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In our apartment there are electronic combo heater/ac units. One of them emits the classic, high-pitched 'electronic" sound so i turn it off all the time which annoys my spouse whose hearing isn't as acute.I assume the heating/ A/C units are heat pump units. Not sure what that high pitch sound is you are hearing from the unit.
My guess the sound could be coming from the fan. If the heat pump unit has the compressor built into the unit it is possible the compressor could be making the sound.
I suggest you have an HVAC Tech check out the unit causing the high pitch noise.
Cheaper than a divorce.