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Hello, are the aluminum fins on the existing condensing unit starting to crumble?
If so you will need a new condensing unit with a corrosion resistant condenser coil.... the cheap way that is done is done a factory applied epoxy coating, which will probably work to extend the life of the new unit to 15 years... there are more expensive options, such as copper tube, copper fin coils probably not warranted in this case.
That model number you gave is not computing, can you double check it for me and tell me if it is a Goodman brand or not, then read the specifications in the sales brochure and tell me if it says corrosion resistant coil or coastal treated coil or not,
We can go from there. Please hold your rating until you have the full and complete answer you need. Thanks.