Yes, you can turn your air conditioner back on after it has thawed completely, but only after you have identified and fixed the root cause of the freezing. If you simply let the ice melt and turn the AC back on without replacing a clogged air filter or repairing a refrigerant leak, the system will freeze right back into a solid block of ice within hours. Once the system is fully thawed, install a clean air filter, ensure all supply vents are open, and then switch the thermostat back to cooling mode. Verification: Monitor the copper suction line for frost and check that chilled air flows from indoor vents.
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