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Old 12-21-2018, 03:16 PM   #16
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Re: Ac/heat pump high whistle sound


sounds like the vibration from the lines is being transferred to and amplified by the exterior wall the lines pass through.

The noise may be different in heating vs cooling mode, as both lines are high pressure in heating mode.
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Old 03-11-2019, 12:24 PM   #17
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Re: Ac/heat pump high whistle sound


I came back to report the solution. The builder moved the AC/ heat pump away from under the bathroom window. I don't hear that whistle sound anymore. Not sure why the placed in the first place under the window.
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Old 03-11-2019, 06:46 PM   #18
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Re: Ac/heat pump high whistle sound


Quote:
Originally Posted by 2Quiker View Post
I came back to report the solution. The builder moved the AC/ heat pump away from under the bathroom window. I don't hear that whistle sound anymore. Not sure why the placed in the first place under the window.
Thanks for the update. It'll help others.

It sounds like it was making a very specific frequency that you can hear fairly well and isn't naturally filtered by the window very well. Sometimes moving the unit doesn't help, as the sound still goes straight through the walls. Do to still hear the same noise when standing near the outdoor unit? Did they move the lineset through a different area of the house, or did they just extend it? (moving it means that if it was probably transmitting the noise through the joists. If they just extended it, the extra length may be acting like a muffler/ vibration absorber. It's not much, but just enough in your case. This has come up in very short linesets before.)

It was probably one of those manufacturing oddities and isn't really converted under warranty but will drive you up the wall. I'm glad it worked out in your case.

Cheers!
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