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I have Lennox 13 ACD A24 Condensing units. One of them is making intermittent humming
I have a lennox 13ACDA24 unit that has started making an intermittent humming noise.Varying time lapses but about every 30-45 seconds. Unit is operating and cooling and the humming continues when the compressor is running , again on 30-45 second intervals. Is this a two stage scroll compressor & does this make a differencen? We are new to this particular location, and have not heard this before.
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