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The A/C and furnace share the same positive feed. Do you have a separate thermostat for the furnace or are they both on the same one?
Then it must be something in the AC side of the power unless the thermostat was damaged.
If the furnace works then the thermostat is getting the needed DC voltage. Check the service breaker for the A/C as that may have been tripped in the process.
If there was a short in the furnace circuit it may have damaged the thermostat. If all else seems good that is the most likely cause here. Is this a Single Zone thermostat?
It might be difficult, but it can be done. You would have to see if there is any signal on the comm wire AT the control board in the A/C when you ask for "Hi Cool" and that might tell you. In the shop it just takes a few minutes to change one out so we do it that way. These thermostats are not that expensive.
Order the whole kit just in case it is the control module. Always good to have a few spare parts around for an emergency.