re: AC Question: Temp increases when I set the thermostat lower

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Sounds like your A coil in the attic is freezing up. You need to check your suction side refrigerant line. That’s the big line going into your outside unit. Either low Freon or low air flow across the coil will cause it to freeze up.

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This is likely the cause, associated with low R-22. Longer run time associated with lowering the thermostat combined with low refrigerant will cause the evap coil to freeze thereby restricting air flow through the coil and into the house, causing the house temp to rise - sounds counter-intuitive - but that’s the way it works.

But it does sound like the refrigerant level is not extremely low because you were maintaining 72 F. But it may be time start squirreling away some $ for a replacement unit.