Finding the Source
If you’re certain that your thermostat is making the noise, one option is to disconnect the thermostat from the AC unit (if you don’t need heating or cooling at the moment).
Start by turning off the system’s power (this might stop the beeping) and then remove the batteries from the thermostat.
Then, the next step is to contact a technician to take a look. An expert will know how to assess the thermostat and help determine any issues in or around your AC unit.
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