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Question DetailsAsked on 11/2/2019

Neighbors HVAC (water source heat pump) makes my HVAC whine - why?

My building has a self contained water source heat pump in each condo. My unit, on the third floor, whines when my neighbors on the first floor use their unit. It happens whether they use heat or A/C and it happens whether my unit is on or off. A repair man said this is caused by a "harmonic vibration traveling through the water pipes." The repair man said he could not do anything because my unit is working fine and I should talk to my HOA. Can anyone tell me what might be causing this?

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