Cost difference - air con fan v air con cooling?

[Pommygranite]

I have reverse cycle ducted and have been running the air con in Fan Mode rather than Air Con Mode at night (all night).

Any ideas of what the cost difference of running them is?

[Pommygranite]

Good responses cheers.

The 80c to 90c per hour figure looks right for us. A lot isn't it.

I think the fan matter will work for now but no good once the nights become humid and it starts sucking in hot air.