Welcome to the forum.
Before you invest in a new thermostat, you might want to pull the shroud off of your A/C and check the placement of your thermistor against the coils. Sometimes the thermistor isn't making contact with the coils and that will cause freeze up. (Its the copper wire looking thingy that should be clipped against the coils).
Thom & Rose
The problem child: 2014 Voltage 3950
The problem solver: 2017 Tiffin Breeze 32BR