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If your house is of very tight construction and if you don't open the door very often then the fresh air mode is a good idea. It brings in some fresh air. Any closed space needs some continual fresh air supply.

The down side. It does bring in some warm air. It will cost you slightly more and take slightly longer to cool a given space. If you feel that your space gets enough fresh air from other sources, then the fresh air mode is not necessary.

Regards.
If your house is of very tight construction and if you don't open the door very often then the fresh air mode is a good idea. It brings in some fresh air. Any closed space needs some continual fresh air supply.

The down side. It does bring in some warm air. It will cost you slightly more and take slightly longer to cool a given space. If you feel that your space gets enough fresh air from other sources, then the fresh air mode is not necessary.

Regards.

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