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Hello, try setting the thermostat down to 60F as a *brief test only... if it keeps cooling lower than 77F we know its a thermostat problem... if it still goes off at 77F or so we know that the unit is cycling on one of its safety switches.
Tell me a lot about your technical skill sets so that I can coach you most effectively.
I need to know about how old the system is and if it uses open well water or a coil if tubing buried in the ground for heat exchange.