Get yourself a meat or cooking thermometer. Make a small hole in the plenum just past the AC coil. Check the temperature there with the unit running after 5-10 minutes. Subtract it from the house temp. If the difference is between 16-20 degF you probably are okay as that is the normal temp drop. That is a pretty good unit and the compressor should last at least 15 yrs if it has been maintained properly. Where do you live?
"Cut it twice and it is still too short".
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