What can be done about a loud outside central air unit?

Yes, it's a bit old, but really cools the house efficiently and quietly. The outside GE unit is a bit loud, sounds like it's coming from the below parts (not the fan above). It's a constant humming, but loud. If it works well, I'd rather not need to replace it. Any ideas?
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It is probably the compressor making the noise. Check the hold down bolts and see if they have rubber mounts that are worn out. You can buy a insulation pad for the compressor to help some, however, I doubt you will be to quiet it down very much. If it is working properly I would not replace it just because of the noise.
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