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As far as I know there aren't any models out there that have any part of the inside air portion that is common with the outside air portion. No designed mixing of outside air (fresh air) or economizer mode as we call it in the trade. There may be some gaps where the evaporator tubing goes in to the evaporator portion (inside coil) or a bad seal on the fan shaft which is common to the outside (condenser) fan so some outside air could be getting in through one of those areas. I assume you have a Dometic unit?
They may be building units now with some designed outside air mixing which although I am not aware of it may be a good idea.
Chas
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