I notice that there are other units that are advertised as having lower sound levels, such as the "Edge Star 9000btu" which is said to have a noise level of less than 54db, and the "Delonghi PAC-03" which is said to have a noise level of 50db or less.
Is it likely true that the above two units are actually 8 to 12 db quieter than mine? I'd hate to go through the trouble of returning the Royal Soverign only to find that the published specs on the other two units are false. Should I return the Royal Sovereign and try one of the other units? (Keep in mind that this it will be a major pain in the neck repackaging this thing and returning it to Sears, and the other units are only available to me via UPS or Fedex shipping.)