Heat/ac unit

My wife came in from the garage saying that the heat/ac unit was making a noise although it was off at the thermostat. My neighbor says that the transformer always is buzzing , while I have never noticed one way or the other. Is this normal? Thanks for any help.
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Some transformers do make a slight humming noise, which can be amplified if it's fastened to sheet metal, etc. I'd feel it and see if it's more than slightly warm. If it is, then replace.
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wrote:

Transformer was the correct answer, thanks.
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In addition to what trade suggested I would suggest that where most of our participants live it is now past the A/C season and you should be able to shut down the system. That would include shutting down A/C (not heatpump) including the 240V supply. That may kill the transformer. Then you can decide if it is enough of a problem to replace it or wait and see what happens in the spring and maybe when it is warmer it may quiet down.

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Joseph Meehan

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Joseph Meehan

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