Hi Matt,
We have a 2013 3750FL and generally dont have any issues unless we are at a site that has no shade. To combat that, we open the ducting up in the kitchen and set both zones at around 65. The front living area seems to cool better this way but yours may be a little different. We generally keep a small fan with us when we camp and to speed things up, we set it on the kitchen counter to help the air move into the living area.
Good luck with your 3750, we love ours.
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