The freeze sensor came with the control module that installs in the intake plenum. It's not part of the thermostat. If you take off your interior plenum cover you should be able to look up into the intake side and see the control board, it mounts on two screws in the intake plenum. You should see 5 or 6 wires coming from the thermostat (depending on whether you have the heat option in your AC unit) and two wires leading up to the sensor on the coils.
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