When the AC is on, I'm starting to hear a subtle rattling noise through the return vent (random times). I went to the basement and sure enough I can hear a faint (not so loud but loud enough to hear it from the first floor) rattling sound. I can't pinpoint if it's something in the air duct or within the furnace/plenum structure. I have to check outside unit once the little one is asleep.
If it's rattling inside and I don't hear anything out of the ordinary with the compressor, what could it be? I will be calling an HVAC company tomorrow. I had it serviced for the summer months on may 18th and there were no issues.
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