I have had something similar in a previous home with a Carrier Heatpump. It only occurred in heating mode with the compressor in low-speed (it had a two-speed compressor) and was best described as a "hum". The system had a fairly long lineset (about 75' IIRC) and I suspected the issue was that the lineset was effectively tuned to the frequency of the compressor. The Contractor had a similar theory and increased the lineset by a few feet (brazed a short piece to the liquid line) and it markedly reduced but did not totally eliminate the problem. The neighbors house was not part of the problem.
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Originally Posted by VillageBud
Has anyone had a low volume, oscillating HUM in their house (new or old). I do and it's been identified as being caused by the AC unit's compressor (neighbor & mine) sending a vibration through the ground and being picked up by the house structure. So far they have only added rubber bushings to the AC units bolts connected to the concrete pad-- helped some but seems to me that this house picks up vibration too easily due to metal in house structure/ceilings (studs/ceiling strips). Any experience & comments? tks
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