Can you turn a frozen air conditioner back on after replacing the filter?

Yes, you can turn a frozen air conditioner back on after replacing the filter, but it's important to let the unit thaw first. Running the AC while it's frozen can cause damage to the compressor and other components. Once the ice has melted and the unit is back to normal operating conditions, you can safely restart it. Make sure to check for any underlying issues that may have caused the freezing in the first place.