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My own system was recently low on Freon, but it was not short cycling. Even though I am a mechanical engineer and 'know how these things work', they can be hard to diagnose on your own without tools. Call the man.
But. if it is truly 25 years old you're looking at a new one most likely. That is old age for an HVAC unit.
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Mike
1976 Euro 911
3.2 w/10.3 compression & SSIs
22/29 torsions, 22/22 adjustable sways, Carrera brakes
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