Loud Noise when AC turns off

Old 04-15-10, 07:06 PM
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Loud Noise when AC turns off

I have had this issue since last year but just havent looked into it yet but now i'm thinking about selling my house... When my A/C unit outside (Heat pump?? my blower and coils are in the utility room in the house) turns off there is a very loud screeching sound that happens for approximately 2 seconds. every time. It is very loud, you can hear it from at least 50 yards (not lawns )away. This does not happen when it is on Heat.

Where do i even begin?????

Thanks in advance for any help you may have!
Old 04-16-10, 06:37 PM
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I feel confident from what you say ta=hat this is pressure equalization when the system shuts down.

Do you hear the noise coming from inside or outside. Might be a check valve which could be an expensive repair.

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