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Want a quiet compressor for home
The sheet metal jacket. Get yourself a 5/16" nutdriver and make sure all the fasteners are tight. In some cases you'll find that as Eugene said, the unit may have settled or wasn't installed level in the first place. This can place a stress on the casing and cause buzzing or excess fan vibration. Sometimes loosening the right screw can alieviate the problem. Carrier is typically one of the quieter units out there.