A wet or frozen thermostat can cause false readings and poor control

https://localcoolinghelp727.zenbloomer.com/posts/what-homeowners-in-florida-should-do-when-the-ac-breaks-down-in-the-heat

A wet or frozen thermostat can cause false readings and poor control. Dry the area, replace batteries if needed, and move the thermostat away from sunlight or heat.