Why is my AC not working after changing the batteries in the thermostat?

There could be a few reasons why your AC is not working after changing the batteries in the thermostat. It's possible that the thermostat settings need to be adjusted or that there is a problem with the AC unit itself. It's best to check the thermostat settings and make sure they are correct, and if the issue persists, you may need to contact a professional to inspect the AC unit.