I am an HVAC contractor in Ma. If your run capacitors are bad they should be replaced period. If they were bad the fan motor or compressor would be overheating and not running correctly. If your unit is running fine now, chances are there is nothing wrong with your run capacitors. If they do need to be replaced they are probably the cheapest component that could be replaced in the system and it should be done. Your contractor is either not being clear or giving you incorrect info. I've never in 37 years just replaced one because its "old".
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